INSTRUCTION MANUALGP-IB ADAPTER
GP-600B

B71-0092-01

CONTENTS
USING THE PRODUCT SAFELY ................................................ Ⅰ-Ⅳ

1. GENERAL ............................................................................................... 1
2. SPECIFICATIONS .................................................................................. 2
3. INSTRUCTIONS ON USE ...................................................................... 4
4. SYSTEM CONFIGURATION .................................................................. 8
4-1. Principle of Operation ....................................................................... 8
4-2. System Configuration ....................................................................... 9
4-3. Output Status when GP-600B is Turned On .................................. 10
5. FRONT AND REAR PANELS .............................................................. 11
6. OPERATION PROCEDURES............................................................... 15
6-1. Setting and Connection .................................................................. 15
6-2. External Control Functions ............................................................. 16
6-2-1 To assemble the connector XG5M-2635-N .................................. 16
6-3. Connection with Power Supply Unit to be Controlled .................... 17
6-3-1 Connection with the PS series ................................................. 17
6-3-2 Connection with PA-B series .................................................... 18
6-3-3 Connection with PD-A series .................................................... 19
6-3-4 Connection with the PT series.................................................. 20
6-4. GP-IB .............................................................................................. 21
6-5. Simple USB (Virtual COM Port) ..................................................... 39
6-6. Total System Adjustment ................................................................ 40
7. OUTSIDE DIMENSIONS ...................................................................... 42

USING THE PRODUCT SAFELY■ Preface
To use the product safely, read this manual to the end. Before
using this product, understand how to correctly use it.
If you read this manual but you do not understand how to use it,call the company that is indicated on the back cover of thismanual. After you read this manual, keep it so that you can readit anytime as required.
■ Notes on reading this manual
The contents of this manual include technical terms in part of their
explanation.
If you do not understand those terms, do not hesitate to ask thecompany or our distributor.
■ Pictorial indication and warning character indication
This manual and product show the warning and caution items
required to safely use the product. The following pictorial
indication and warning character indication are provided.
<Pictorial Indication>
Some part of this product or the manual may show thispictorial indication. In this case, if the product isincorrectly used in that part, a serious danger may bebrought about on the user's body or the product.
To use the part with this pictorial indication, be sure torefer to this manual.
<Warning characterIndication>

WARNINGCAUTION

If you use the product, ignoring this indication, you
may get killed or seriously injured. This indicationshows that the warning item to avoid the danger isprovided.
If you incorrectly use the product, ignoring thisindication, you may get slightly injured or the productmay be damaged. This indication shows that thecaution item to avoid the danger is provided.

Please acknowledge beforehand that our company does not assume
the responsibility for the user or the third person’s misuse, abuse,neglect, unauthorized product modification or failure to follow thismanual, and other troubles, or any damages caused by use of thisproduct.
I

USING THE PRODUCT SAFELYWARNING■ Do not remove covers and panels from the product.
Never remove the product's covers and panels for any purpose.
Otherwise, electric shock to the users or a fire may be incurred.
■ Warning on using the product
The warning items given below are to avoid danger to the user’s
body and life and avoid the damage and deterioration of the product.
Use the product, observing the following warning and caution items.
■ Warning about Power Source●Source voltage
Use the product on the rated source voltage marked on the product.
Using the product on other voltage may result in a fire. The rated
voltage range of the product is the marked voltage ±10%. Use theproduct in this range.
●Power Cable

IMPORTANT: The power cable set supplied with the GP-600B is
unusable for any other products.
Disuse the power cable and contact our distributor if the supplied
power cable becomes defective. Using the product with thedefective power cable may result in electric shocks, electrocution, ora fire.
●The fuse for protection

The product will not run if its input power protection fuse flows out.
The protection fuse is built in the product, and the user cannot
replace it. When the fuse blows out, contact our distributor without
opening the casing. The user must not open the casing or replace
the fuse arbitrarily. Disobedience to this instruction may result inelectric shocks, electrocution, or a fire.
●Changing the source voltage rating

The user cannot change the source voltage of the product. Contact
our distributor, if it is necessary to change the source voltage rating
marked on the product. The user must not open the casing orchange the source voltage rating. Disobedience to this instruction
may result in electric shocks, electrocution, or a fire.
IIUSING THE PRODUCT SAFELYWARNING■ Warning item on grounding
The product has the GND terminal on the panel surface to protect theuser from electric shock and protect the product. Be sure to groundthe product to safely use it.
■ Warning item on installation environment●Operating temperature
Use the product within the operating temperature indicated in therating column. If the product is used with the vents of the productblocked or in high ambient temperatures, a fire may occur.
●Operating humidity
Use the product within the operating humidity indicated in the ratingcolumn. Watch out for condensation by a sharp humidity changesuch as transfer to a room with a different humidity. Also, do not
operate the product with wet hands. Otherwise, an electric shockor fire may occur.
●Use in a gas
Use in and around a place where an inflammable or explosive gas or
steam is generated or stored may result in an explosion and fire.
Do not operate the product in such an environment.
Also, use in and around a place where a corrosive gas is generated
or spreading causes a serious damage to the product. Do not use
the product in such an environment.
● Do not let foreign matter in
Do not insert metal and flammable materials into the productfrom its vent and spill water on it. Otherwise, an electric
shock and fire may occur.
■ Warning item on abnormality while in use
If smoke or fire is generated from the product while in use, stop using
the product, turn off the switch, and remove the power cord plug fromthe outlet. After confirming that no other devices catch fire, call thecompany or our distributor.

III

USING THE PRODUCT SAFELYCAUTION■ Input/output terminal
Maximum input to the input terminals is specified to prevent the
product from being damaged.
Do not supply input, exceeding the specifications that are indicatedin the "Rating" or "Caution on use" column in this manual of the
product. Otherwise, a product failure is caused.
Also, do not supply power to the output terminals from the outside.
Otherwise, a product failure is caused.
■ When the product is left unused for a long time
Be sure to remove the power plug from the outlet.

<Calibration>
Although the performance and specifications of the product arechecked under strict quality control during shipment from the factory,
they may slightly change because of secular changes in its parts. It
is recommended to periodically calibrate the product so that it is usedwith its performance and specifications stable. For consultation
about the product calibration, call the distributor or the company
where you bought the product.

<Daily maintenance>

When you clean off the dirt of the product covers, panels, and knobs,
avoid solvents such as thinner and benzene. Otherwise, paint may
peel off or the resin surface may be affected.
To wipe off the covers, panels, and knobs, use a soft cloth withneutral detergent in it.
During cleaning, be careful that water, detergents, and other foreign
matters do not get into the product.
If a liquid or metal gets into the product, an electric shock and fire arecaused. During cleaning, remove the power cord plug from the outlet.
Use the product correctly and safely, observing the above warning andcaution items.
Because this manual indicates caution items even in individual items,
observe those caution items to correctly use the product.
If you have questions or comments about the content of this manual,
call the company or our distributor.
IV1. GENERALThe GP-600B adapter is designed to set the constant voltage andconstant current and control the OUTPUT switches and power relaysof the regulated DC power supply units, PS, PA-B, PD-A and PT series
from a computer through the GP-IB bus (in conformity to theIEEE488-1978).
- The GP-600B has an interface function in conformity to theIEEE488-1978.
The GP-600B also has an SRQ function to detect errors in the
power supply units for safety system control.
- The GP-600B converts digital signals through the GP-IB bus
into two channels (four references) of analog signals.
The GP-600B has two references per channel and can control
the voltage and current of the power supply units through a single
channel. Each channel of the GP-600B is isolated. A D/Aconverter with 12-bit resolution is used for each reference,
allowing high-precision setting.

12. SPECIFICATIONS【GP-IB】
Electrical specifications: In conformity to the IEEE488-1978.
Mechanical specifications: In conformity to the IEEE488-1978.
Interface functions: SH1,AH1,T6,L3,SR1,RL2,PP0,DC1,DT0,C0
Address setting: Set addresses 0 to 30 optionally with theaddress switches.
Listen-only mode
: Set with the L-ONLY switch.
Delimiter: Set with the EOI/CR.LF switch.
Output Off function: Turn off output with the OUTPUT OFF key.
Service request functions: GP-IB command errors
GP-IB parameter errors
OVP operation and alarm(OCP, OTP and power off) operations
CV operation, CC operation and
OUTPUT OFF key【Analog Outputs】
Outputs A & B (CH1)
Output voltage range: 0V to10V
Full-scale voltage range : 10V±15%
Max. output current: 3mA
D/A converter resolution : 12bit,0.025%(2.4mV)
Output ripple noises(r.m.s) : 500μV(10Hz to 1MHz)
Input power fluctuation : 1.5mV(±10% variance)
Temperature coefficient : 50ppm/℃(Typical)Rise time: 100μs or less
(10% to 90%,10kΩ load)2

Outputs C & D (CH2)
0V to 10V
10V±15%3mA
12bit,0.025%(2.4mV)
500μV
1.5mV
50ppm/℃
100μs or less

【Digital I/O】
Control signals OUTPUT ON/OFF
POWER relay ON/OFF
Status signals CV operation (SRQ)
CC operation (SRQ)
Alarm ON(SRQ)
Power ON/OFFOVP ON(SRQ)

TTL level
TTL level
TTL level
TTL level
TTL level【Operation Conditions】
Guaranteed operating temp. range
Guaranteed humid. range【Dielectric Strength】
GP-IB connector - analog output
Between analog outputs(A-C, D, and B-C, D)
Analog output - casing
Input power source - casing
Input power source - analog output【Insulation Resistance】
Input power source - casing
Analog output - casing

Low(ON)/High(OFF)
Low(ON)/High(OFF)
Low(CV)/High(indefinite)
Low(CC)/High(indefinite)
Low(ON)/High
Low(ON)
Low(ON): 0℃ to 40℃: 80% or less: AC500V for 1 minute: AC500V for 1 minute: AC500V for 1 minute: AC1.5kV for 1 minute: AC1.5kV for 1 minute: DC500V 30MΩ or more
: DC500V 30MΩ or more

【Power Source & Power Consumption】: AC100V±10%,50Hz/60Hz
AC120V, 200V, 220V and 240V are
selectable with an internal switch 7W【Dimensions (max.) & Weight】(W)70mm x (H)134mm x (D)363.1mm,
approx. 2.5 kg【Accessories】
CD-ROM (Instruction manual) 1
20-pin connectors
2Power cable13

3. INSTRUCTIONS ON USE●Checking the power source-Use the GP-600B on the source voltage rating.
●Replacing the fuse, and changing the source voltage rating-Contact our distributor if it is necessary to replace the fuse orchange the source voltage rating.
●Ambient temperature and installation site

-Do not use the GP-600B in a place whose temperature and/or
humidity exceeds the rating.
-Do not use the GP-600B in a place with much dust or vibrations.
-Take noise reducing measures properly if there is a large noise
source around the GP-600B.
●Before turning on the GP-600B-Complete all connections and make sure that connections are done
properly before turning on the GP-600B.
-Turn on or off power in the order shown in the drawing below.
-Do not plug or unplug any connector in the power on condition.

Power onControlled power
supply unit

GP-600B
Power off4

●Precautions for connecting the GND cable and shorting bar-Be sure to connect the GND cable and shorting bar of the power
supply unit as shown below when the GP-600B is combined withfloating circuit type power supply units.

PS series power supply unit
Rear panel of the PS series
GND cable

GND

GND

×
＋

×
＋

－

Connect the GND cable between
the + and GND terminals, ordisconnect the GND cable asshown on the right.

－

Be sure to disconnect the GND
cable when it is not used.

5

PA-B series
Precautions for connecting the GND cable and shorting bar
Shorting bar
－

GND

＋

－

GND

＋

Disconnect the shorting bar.

Connect the shorting bar between
the - and GND terminals, ordisconnect the GND cable asshown on the right.

PD-A series
Precautions for connecting the GND cable and shorting bar
＋

＋

－

－

Shorting bar

Connect the shorting bar between
the + and GND terminals, ordisconnect the GND cable asshown on the right.

Disconnect the shorting bar.

6

●System interface-Be sure to use control software applicable to the service requests
when the GP-600B is used with the service requests enabled.
-Give listen-only specification from the controller when the GP-600B
is used in the listen-only mode.
●Output ripple noises-When the GP-600B is connected with the regulated DC power
supply units, the DC power supply units may output more ripple
noises than those in individual operation. This is because thecables lead to bad influences upon noises or the regulated DC power
supply units amplify ripple noises output from the GP-600B.
●Precautions for connection-The GP-600B converts digital signals through the GP-IB bus into
analog signals with two D/A converters in two isolated channels andoutputs individual four-channel analog signals. However, do not
use the reference channels B and D in the floating condition. Such
operation does not guarantee the proper performances. Be sure
to connect the negative (-) output of the channel B with the negative(-) output of the channel A and the negative (-) output of the channel
D with the negative (-) output of the channel C, when the channel B
and D are used individually.

7

4. SYSTEM CONFIGURATION
4-1. Principle of Operation
Digital signals through the GP-IB connector are supplied to the
GP-IB interface IC through the bus transceiver.
The handshaking timing of this GP-IB interface conforms totheIEEE488-1978. Codes received by the GP-IB interface are
decoded by the CPU then. The CPU converts the data into
binary data and outputs to the D/A converters through serial
output ports. Those data pass through photo-isolators and are
isolated. The shift registers convert them into parallel data,
which are input to the D/A converters. The CPU also executes
controls of the control connectors and SRQ processing.
The block diagram of the GP-600B is as shown below.

Block diagram
GP-IB connector
GP-IB bus transceiver
GP-IB interface IC
CPU
ROM
RAM
Port

OUTOUT
CONT 1OUTPUT
CONT 2POWER
CONT 1

Photo-isolator

Photo-isolator

Photo-isolator

Photo-isolator

Shift register

Shift register

Shift register

Shift register

D/A

D/A

D/A

D/A

OUT A

OUT B

OUT C

OUT D

POWER
CONT 28

4-2. System Configuration
Check the specifications of the GP-600B and power supply
units to configure the most appropriate system.
1) I/O specifications of the GP-600B
1

2

CH1 and CH2 connectors
on the rear panel

19

20

Pin No.
FunctionsRemarks
Analog output, 0V - 10V: Voltage control
1
GND for voltage control terminals
2
Analog output, 0V- 10V: Current control
7
GND for current control terminals
8
3 to 6 NC
Digital output: Output On/Off (+)
9Photo-coupler
Digital output: Output On/Off (-)
10
Photo-coupler
Digital input: Alarm signal
11
HC14
Digital GND
12Digital input: CV mode signal
13
HC14
Digital input: CC mode signal
14
HC14
Digital input: Power On signal
15
HC14
Digital input: OVP signal
16
HC14
Digital output: Output On/Off
17
HC07
Digital output: Power On/Off
18
HC07
Digital power supply, +5V
19
Digital GND
20* Both the CH1 and CH2 connectors have the same specifications.
92) Connectable series
The GP-600B may control the following series.
PS series, PA-B series, PD-A series, and PT series

4-3. Output Status when GP-600B is Turned On
CH1 voltage control output
CH1 current control output
CH1 output control
CH1 power relay control
CH2 voltage control output
CH2 current control output
CH2 output control
CH2 power relay control(Reference A)(Reference B)(Reference C)(Reference D)

10

0V
0V
5V
5V
0V
0V
5V
5V

(Off)
(Off)

(Off)
(Off)

5. FRONT AND REAR PANELS

１LISTEN

３５

GP-IB

REMOTE

２

CH1

CH2

22

４
20

23

６
７
１０
１３
１６

８
１１
１４
１７

SERIAL

９
ON（1）

１２

OFF（0）
E0I / CR.LF

１５

L.ONLYAC INPUT

100/115/200/230V～

21

１８

25
24

１９

MADE IN CHINA

26① ADDRESS
Normally, the address set with the address switches on the rear
panel is displayed here.
No data is displayed in the listen-only mode.
② SRQ
This LED indicates the service request status.
It is lit while an SRQ resides on the GP-IB bus.
③ TALK
This LED indicates the talk status.
It is lit when the talker status is specified on the GP-IB bus.
④ LISTENThis LED indicates the listen status.
Normally, it is lit when the listener status is specified on the GP-IB bus.
It is always lit, in the listen-only mode.

11

⑤ REN
This LED indicates the remote status.
It is lit during the remote status (where the power supply units arecontrolled through the GP-IB bus).
It is always lit, in the listen-only mode.
⑥ OUTPUT OFF(Non lock)This switch nulls the reference output and turns off output when
one of reference outputs A to D or channel 1 and 2 outputs is set.
A service request is also output in this condition.
See the description enclosed in the rectangular frame on page 32
for the procedures of resetting this status to the previous status.
⑦ CH1 A 0V
This semi-fixed (one-turn) resistor is used to adjust the output
offset of channel 1, A.
⑧ CH1 A FS COARSE
This semi-fixed (four-turn) resistor is used to adjust the output
voltage of channel 1, A coarsely.
⑨ CH1 A FS FINE
This semi-fixed (one-turn) resistor is used to adjust the output
voltage of channel 1, A finely.
⑩ CH1 B 0V
This semi-fixed (one-turn) resistor is used to adjust the output
offset of channel 1, B.
⑪ CH1 B FS COARSE
This semi-fixed (four-turn) resistor is used to adjust the output
voltage of channel 1, B coarsely.
⑫ CH1 B FS FINE
This semi-fixed (one-turn) resistor is used to adjust the output
voltage of channel 1, B finely.
⑬ CH2 C 0V
This semi-fixed (one-turn) resistor is used to adjust the output
offset of channel 2, C.

12

⑭ CH2 C FS COARSE
This semi-fixed (four-turn) resistor is used to adjust the output
voltage of channel 2, C coarsely.
⑮ CH2 C FS FINE
This semi-fixed (one-turn) resistor is used to adjust the output
voltage of channel 2, C finely.
⑯ CH2 D 0V
This semi-fixed (one-turn) resistor is used to adjust the output
offset of channel 2, D.
⑰ CH2 D FS COARSE
This semi-fixed (four-turn) resistor is used to adjust the output
voltage of channel 2, D coarsely.
⑱ CH2 D FS FINE
This semi-fixed (one-turn) resistor is used to adjust the output
voltage of channel 2, D finely.
⑲ POWER
Press this power switch to turn on the GP600-B. When the
GP600B is turned on, the ADDRESS 7-segment LED goes on(normally) or the LISTEN LED goes on (in the listen-only mode).
⑳ GP-IB connector
This is a 24-pin Amphenol connector in conformity to the GP-IB
Standards (IEEE488-1978). Connect the GP-IB bus cable tothis connector.
21 Address switches○
Use these switches to set the address of the GP-600B on the
GP-IB bus, listen-only mode, and send delimiter. (See page 15.)
22 CH1 connector○
Connect a cable between this connector and a power supply unit
to be controlled. Analog outputs A and B and digital control
signals of channel 1 are input and output through this connector.

13

23 CH2 connector○

Connect a cable between this connector and a power supply unit
to be controlled. Analog outputs C and D and digital control
signals of channel 2 are input and output through this connector.
24○ USB connector
A simple USB (virtual COM) port. Connect a USB cable.
25 AC inlet○
Connect the AC power cable supplied with the GP-600B to this
inlet.
26 GND terminal screw○
Be sure to connect a grounding wire to this terminal in order toensure safety and to avoid malfunctioning caused by external
noises.

14

6. OPERATION PROCEDURES
6-1. Setting and Connection
1) Connecting the GP-IB bus cable-Connect the GP-IB bus cable between the GP-IB connector
receptacle of the GP-600B and the controller.
NOTE: Never plug or unplug the connector while the GP-600B is
electrified. Disobedience to this instruction may result in
malfunctioning or troubles.
Fix the GP-IB bus cable to the GP-IB connector receptacleof the GP-600B firmly with the screws.
2) Setting the address, listen-only mode, and send delimiter-Use the address switches (8-bit DIP switches) on the rear panelof the GP-600B to set the address of the GP-600B on the GP-IB
bus, listen-only mode, and send delimiter.
(ON)(1)
EOI/CR,LF
L.ONLYADDRESS

5
4
3
2
1

(OFF)
(0)

ON : CR. LF+EOI
OFF : CR. LF

Send delimiter setting switch
Unused. (Normally set to OFF.)
Listen-only mode setting switch
24 (MSB)
23
Address setting switches
22
Setting example
21:01100 (address 12)
20 (LSB)-Set the address in binary with the address switches (1 to 5).
It may be freely set in the range from 0 to 30. It is prohibited to
set all switches to ON (i.e., address 31). Do not attempt suchsetting.
-Set the L.ONLY switch to ON to set the listen-only mode.
-Set the EOI/CR.LF switch to ON to select the "CR.LF + EOI"
delimiter. Set the switch to OFF to select the "CR.LF" delimiter.

15

NOTE: Setting of the address switches is read in when the GP-600B
is turned on. Be sure to carry out setting before turning on
the GP-600B.
3) Output Off function-The reference outputs A, B, C and D are reset to zero (i.e.,
outputs are turned off) when the OUTPUT OFF key on the panelof the GP-600B is pressed. The outputs may be restored withthe command with no parameter (shown in the frame on page 32).
The connected power supply units stay in the remote state.
Bring each unit individually into the local state.

6-2. External Control Functions
Following connector for external control is supplied with the
product.
1. XG5M-2635-N (manufactured by OMRON Corporation)

This section describes how to assemble the external control connector.

6-2-1 To assemble the connector XG5M-2635-N
The mounting of the wire to the contact, in order to improve thereliability, please use the (OMRON) special tool XY2B-7006. In
addition, the application wire rod is twist line AWG28 - AWG26,
external form Φ1.1-Φ1.3.
Specifically, please review an instruction manual of XY2B-7006. For
details, please confirm the operation manual of XY2B-7006.
In the case of faulty wiring or wiring change, please use the(OMRON) special tool XY2E-0001 that is withdrawn from thehousing contact. For details, please confirm the operation manualof XY2E-0001.

16

6-3. Connection with Power Supply Unit to be Controlled
6-3-1 Connection with the PS series

Rear panel of GP-600B

CH1

Rear panel of CH2 PS series

CH2

S1

20-pin flat cable

Rear panel of CH1 PS series

S1

20-pin flat cable-Use the OP-18-PS to connect the PS series with the GP-600B.
-Setting of the DIP switch cluster S1
Set the DIP switches of the PS power supply units as shown
below when connecting them with the GP-600B.
S1
ON 1

2

3

4

5

6

7

8

9 10

Switches 3, 5 and 7: ON
17

6-3-2 Connection with PA-B series
Rear panel of GP-600B

CH1

Rear panel of
PA-B series

CH2

20 pinGP-600B
connector Nos.
1
2
7
8
9
10
13
14
11
12

Brown V.V+
Black V.VV.R1
V.R2
Red I.V+
Orange I.VI.R1
I.R2
Yellow OUTPUT 1
Green OUTPUT 2
Blue
Purple CV
White CC
Gray ALARM
COMMONI.MON+
I.MONV.MON+
V.MON-

J2-Connect CH2 in the same manner.

-Carry out wiring as shown above using the connectors suppliedwith the GP-600B, or use the OP-18-PAB to connect with the
GP-600B.
-Set the Vext. V, lext. V and OUTPUT switches on the front panelof the PA-B series to the upper positions.
-Connect the voltage control wires even if current control is only
used.

18

6-3-3 Connection with PD-A series
Rear panel of GP-600B

CH1

Rear panel of PD-A series

CH212orange

11
10

red

9

Constant
Current setting

8
7
6
black
brown

8
7
2
1

5
4
3

orange
red
black
brown

Disconnect the
Shorting bars

Constant
Voltage setting

2
1

19
１2
１5
１7
13
20
１4

１
２
３
４
５
６
7

EXT I/F(option)GP-600B connector Nos.
Connect with DIN connector
On the PD-A series rear panel- Connect CH2 in the same manner.
- Carry out wiring as shown above using the connectors suppliedwith the GP-600B, or use the OP-18-PDA to connect with the
GP-600B.
- The optional device is required for output On/Off control andstatus signal control.
196-3-4 Connection with the PT series

Rear panel of GP-600B

CH1

CH2

Rear panel of CH2 PT series

20 pin cable
S1

Rear panel of CH1 PT series

S1

20 pin cable

Use the OP-18-PT to connect the PT series with the GP-600B.
Connect the 20-pin connector with the GP-600B and 26-pin
connector with the PT series.
- Setting of the DIP switch cluster S1

ON 1

2

3

4

5

6

7

8

9 10

Switches 6, 7 and 8: ON

20

6-4. GP-IB
1) Interface
The general-purpose interface bus GP-IB is an internationallystandardized interface bus for measuring instruments. It is abyte-serial, bit-parallel interface bus specified in the interface
standards.
It allows measuring system configuration thatconsists of a maximum of fifteen devices, including the controller
and measuring instruments, with the total maximum cable lengthof 20 meters (provided the maximum length of each cable is four
meters) at the maximum transmission rate of 1Mb/s or less.
It features a three-wired asynchronous handshaking method, anddevices of different transmission rates may reside in a single
system.
Piggyback connection allows the devices to beconnected by plugging a connector on another one.
Fig. 1 shows the timing chart of the hand shaking sequence.
Fig. 2 shows the flow chart.
Timing chart of the hand shaking sequence
1st data byte
D10
1～8

DAV

2nd data byte
11

3

21

1

23
6 Data valid 10 Data invalid 12

16 Data valid 20

Data invalid

4
Acceptor

5
NRFD

7

15 17
Acceptor

2
All acceptors
are ready toreceive data.
8

NDAC

14

23

All acceptors
are ready toreceive data.
9

13

18

19

22
23

2
All acceptors havecompleted data
reception.

21

All acceptors havecompleted data
reception.

Flow chart
Source

Hi: High level
Lo: Low level

Start

Start

DAV isset to Hi.

①③

Are both
NRFD and
NDAC Hi?

②

NRFD and
NDAC are set
to Lo.

YES
NO

NO

Error display③ ⑪

Ready toreceivedata?

YES

New signal
to DIO
⑤ ⑭ ⑮
④ ⑫

End

NRFD isset to Hi.

Delay until
stabilizing

NO

NRFD goes Hi
only when all
acceptors areready.

Is NRFD
Hi?

NO

YES
⑥ ⑯

YES

Data go valid.
Ready to receivethem.

DAV is set
to Lo.

Is DAVLo?

⑦ ⑰
NRFD isset to Lo.

NOIs NDACHi?
Receives
DIO signal.

YES

NDAC stays Lo
until all acceptors
receive data.

NDAC isset to Hi.

⑧ ⑨⑱ ⑲
NDAC isset to Lo.

NO

YES

⑩ ⑳

Hereinafter, data
are invalid.

DAV is set
to Hi.

YES⑬ 22
Is DAV Hi?

Are there
other data?

NO

End

22

2) Command format
A command consists of an alphabetic command operand, whichshows the contents, and an alphabetic or numeric parameter,
which follows the command operand. The command operandand parameter must be separated with one or more spaces.
A space in the command operand or parameter causes acommand or parameter error.
Example: Mode setting PA18-2B

MODE _

18,2
ParameterSpace
Command

It is possible to write several commands on a single line if they areseparated with separators ":" or ";". (Multi-statement) However,among data request commands, the last one is only valid. If acommand contains an error, that command causes a GP-IB error
SRQ and the following command is executed. A delimiter isadded to the end of a command. Any of the following may be
used as the delimiter.
CR.LF
CR
LF
CR.LF+EOI
CR+EOI
LF+EOI
EOI

23

It is possible to select CR.LF or CR.LF + EOI as the send delimiterwith the address switches on the rear panel.
Control Command List
Commandname(Parameter)

Default
value

Type

Function nameCommon command

C

Resets the value to thedefault.

*RST

---

Common command

C

Clears the status byte.

*CLS

---

Common commandQ

Reads the equipment ID.

*IDN?

---

Data setting command 1
Data setting command 2
Data setting command 3
Data setting command 4
Data setting command 5
Data setting command 6
Data setting command 7
Data setting command 8

CQ
CQ
CQ
CQ
CQ
CQ
CQ
CQ

SELECT X1
MODE X1,X2
VOLT X1
AMP X1OUT X1POWER X1
MASK X1OFFCH X1------------1111111111
1

Data setting command 9

CQ

MODEA X1---

Data setting command 10

CQ

MODEB X1---

Data setting command 11

CQ

MODEC X1---

Data setting command 12

CQ

MODED X1---

Data setting command 13

CQ

SETA X1---

Data setting command 14

CQ

SETB X1---

Data setting command 15

CQ

SETC X1---

Data setting command 16

CQ

Sets a channel.
Sets a voltage/current mode.
Sets the voltage.
Sets the current.
Output control
Power relay control
Sets SRQ masking.
Sets an output Off channel.
Sets the maximum value ofthe reference A.
Sets the maximum value ofthe reference B.
Sets the maximum value ofthe reference C.
Sets the maximum value ofthe reference D.
Sets the output value ofthe reference A.
Sets the output value ofthe reference B.
Sets the output value ofthe reference C.
Sets the output value ofthe reference D.

SETD X1---

Data setting command 17

CQ

Sets the SRQ masking time.

MTIME X1

10

Data setting command 18

CQ

Sets the listen-only mode.

LISTEN X1

0

CQ

Inquires about the status
data.

STATUS?

Data request command---

NOTES: 1. “C” means a command function and “Q” means a query
function in “Type” above.
2. “X1” and “X2” in commands are parameters.
(See the command list.)243) Common commands
Command: *RSTFunction: Resets the followings to the default values.
Clear the communication buffer.
Clear each command parameter.
Clear the status byte.
However, the REN status is unchanged to ensure thecommand operation.
(The REN and LISTEN LEDs go on.)Command: *CLSFunction: Clear the status byte.
Command: *IDN?
Function: Read the device ID.

TEXIO

GP-600B, 0, VER＊.＊＊
Firmware version
Serial No. (unused)
Model name25

4) Data setting commands (Listener operation)
1. Channel setting
Command: SELECT X1
Function: Specify a channel whose power supply unit model,
voltage and power mode, output voltage, output current,
output, and power relay are to be set. When the
GP-600B is turned on first, no channel has been set yet.
Thus, the MODE, VOLT, AMP, OUT or POWER command
causes a GP-IB run error if it is executed without settinga channel. Once a channel is specified, it is stored.
Parameter: X1: 0: Select both channels 1 and 2.
1: Select channel 1.
2: Select channel 2.
2. Voltage and current mode setting
Command: MODE X1, X2
Function: Function: Set the rated voltage and current of thepower supply unit connected to a selected channel.
The reference output of the channel set with thiscommand may only be set with the VOLT and AMP
commands. If this command is received while
outputting the reference, the reference output of theselected channel is reset to zero.
Parameter: X1: X1: Rated voltage (0.01 to 9999.99)
X2: Rated current (0.01 to 9999.99)
The format of the numeral is XXXX.XX.

26

3. Voltage setting
Command: VOLT X1
Function: Function: Set the output voltage of the power supply
unit in the selected channel. This command is available
only when the rated voltage and rated current of theselected channel are set with the MODE command.
Otherwise, this command causes a GP-IB run error. If
the output voltage is greater than the rated voltage, aparameter error occurs. The output voltage is set tozero when the GP-600B is turned on.
Parameter: X1: Output voltage (0 to rated voltage)
The format of the numeral is XXXX.XX.
The relationship between the reference output(s) and selectedchannel(s) is as shown below:
SELECT 0: References A and C
SELECT 1: Reference A
SELECT 2: Reference C
4. Current setting
Command: AMP X1
Function: Set the output current of the power supply unit in theselected channel. This command is available only when
the rated voltage and rated current of the selectedchannel are set with the MODE command. Otherwise,
this command causes a GP-IB run error. If the output
current is greater than the rated current, a parameter
error occurs. The output current is set to zero when
the GP-600B is turned on.
Parameter: X1: Output current (0 to rated current)
The format of the numeral is
XXXX.XX.
The relationship between the reference output(s) and selectedchannel(s) is as shown below:
SELECT 0: References B and D
SELECT 1: Reference B
SELECT 2: Reference D27

5. Output control
Command: OUT X1Function: Turn on or off the output of the selected channel(power supply unit). The output is off when the GP-600B
is turned on.
Parameter: X1 : 0－Turns off output
1－Turns on output
6. Power relay control
Command: POWER X1
Function: Turn on or off the power relay of the selected channel(power supply unit). The power relay is off when the
GP-600B is turned on.
Parameter: X1: 0－Turn off the power relay.
1－Turn on the power relay.
※ This command is not functional for the PA-B and PT series.

28

7. SRQ masking
Command: MASK X1
Function: Mask SRQ factors produced by the controlled power
supply units. All are enabled when the GP-600B is
turned on.
Parameter: X1: ＊＊＊＊＊＊＊＊＊＊
Power switch of power supply
is turned off
Power supply channel 2
outputs An alarm signal
Power supply channel 2 enters
the OVP status.
Power supply channel 2 enters
the CC mode
Power supply channel 2 enters
the CV mode
Power switch of power supply
channel 1 is turned off
Power supply channel 1 outputs
an alarm signal
Power supply cannel 1 enters
the OVP status
Power supply channel 1 enters
the CC mode
Power supply channel 1 enters
the CV mode

0: Masks the factors.
1: Enables the factors.

29

8. Output Off channel setting
Command: OFFCH X1
Function: Specify channel(s) to which the GP-600B turns off
output (i.e., it resets the output voltage and current tozero and turns off output) in the case where an OVP,
alarm, or power switch Off condition occurs in the
power supply units. It is set to 1 when the GP-600B is
turned on.
Parameter: X1: 0- Do not turn off output.
1- Turn off output of only the channel where an OVP,
alarm, or power switch Off condition occurs.
2- Turn off outputs of both channels 1 and 2.
9. Maximum value setting of reference A
Command: MODEA X1
Function: If the maximum value of the reference A is set with thiscommand, the reference output may be only changed
with the SETA command. The reference output isreset to zero if this command is sent while thereference is being output.
Parameter: X1: Maximum output (0.01 to 9999.99)
The format of the numeral is XXXX.XX.
10. Maximum value setting of reference B
Command: MODEB X1
Function: If the maximum value of the reference B is set with thiscommand, the reference output may be only changed
with the SETB command. The reference output isreset to zero if this command is sent while thereference is being output.
Parameter: X1: Maximum output (0.01 to 9999.99)
The format of the numeral is XXXX.XX.

30

11. Maximum value setting of reference C
Command: MODEC X1
Function: If the maximum value of the reference C is set with thiscommand, the reference output may be only changed
with the SETC command. The reference output isreset to zero if this command is sent while thereference is being output.
Parameter: X1: Maximum output (0.01 to 9999.99)
The format of the numeral is XXXX.XX.
12. Maximum value setting of reference D
Command: MODED X1
Function: If the maximum value of the reference D is set with thiscommand, the reference output may be only changed
with the SETD command. The reference output isreset to zero if this command is sent while thereference is being output.
Parameter: X1: Maximum output (0.01 to 9999.99)
The format of the numeral is XXXX.XX.
13. Output setting of reference A
Command: SETA
Function: Set the output of the reference A. This command isavailable only when the maximum value of thereference A is set with the MODEA command. In
other condition, this command causes a GP-IB run
error. The reference output is set to zero when the
GP-600B is turned on.
Parameter: X1: Output value(0 to maximum set value of the reference A)
The format of the numeral is XXXX.XX.

31

14. Output setting of reference B
Command: SETB X1
Function: Set the output of the reference B. This command isavailable only when the maximum value of thereference B is set with the MODEB command. In
other condition, this command causes a GP-IB run
error. The reference output is set to zero when the
GP-600B is turned on.
Parameter: X1: Output value(0 to maximum set value of the reference B)
The format of the numeral is XXXX.XX.
15. Output setting of reference C
Command: SETC X1
Function: Set the output of the reference C. This command isavailable only when the maximum value of thereference C is set with the MODEC command. In
other condition, this command causes a GP-IB run
error. The reference output is set to zero when the
GP-600B is turned on.
Parameter: X1: Output value(0 to maximum set value of the reference C)
The format of the numeral is XXXX.XX.
16. Output setting of reference D
Command: SETD X1
Function: Set the output of the reference D. This command isavailable only when the maximum value of thereference D is set with the MODED command. In
other condition, this command causes a GP-IB run
error. The reference output is set to zero when the
GP-600B is turned on.
Parameter: X1: Output value(0 to maximum set value of the reference D)
The format of the numeral is XXXX.XX.
32

If the parameter of the AMP, VOLT, OUT, SETA, SETB, SETC or
SETD command is omitted, the parameter is automatically set to thevalue used previously. This function allows the previous setting to
be restored even when the OUTPUT OFF key is pressed and each
output is turned off.
Example: When the rated values (references A and B) of channel 1
are set with the MODE command and the rated values(maximum values) of the references C and D are set with
the MODEC and MODED commands
SELECT 1 :VOLT :AMP :OUT
SETC :SETD :SELECT 2 :OUT
17. SRQ masking time setting
Command: MTIME X1
Function: Specify the time of masking service request output in
CV or CC operation when the output is turned on (withthe OUT 1 command).
The time is set in 10 ms multiplied by the parametervalue. (10 ms x parameter value)
This command only masks the service requests caused
in CV and CC operations of a channel whose output isturned on. Service requests due to other causes areissued. The parameter of this command is always set
to 10 (i.e., 100 ms) when the GP-600B is turned on.
Parameter: X1: 2 to 100
The format of the numeral is XXXX.XX.

NOTE: The GP-600B checks the status of the power supply units at
the 100ms interval. Thus, it may issue a service request in
CV or CC operation after turning on output a maximum of 100
ms later than the preset masking time.

33

18. Listen-only mode setting
Command: LISTEN X1
Function: Bring the GP-600B into the listen-only mode while it is
not in the listen-only mode, and changes the listen-onlymode into the normal mode.
In the listen-only mode, the GP-600B cannot issue
service requests or send data, and accordingly thecontroller cannot check the conditions of the power
supply units. Please note this.
When several GP-600B units are connected with the
GP-IB bus, it is necessary to bring each unit into thelisten-only mode by specifying its address. However,
all units return to the normal mode, regardless of theaddresses, when the command is issued once.
Parameter: X1: 0－Returns to the normal mode.
1－Brings the GP-600B into the listen-only mode.

345) Data request commands
1. Inquiry about CC, CV, OVP, alarm and power switch status
Command: STATUS?
Function: Inquire about the CC, CV, OVP, alarm and powerswitch status.
Response: STATUS X1Parameter: X1: ＊＊＊＊＊＊＊＊＊＊
Power switch of power supply
channel 2 is off
Power supply channel 2 outputs
an alarm signal
Power supply channel 2 is in
the OVP status
Power supply channel 2 is in
the CC mode
Power supply channel 2 is in
The CV mode
Power switch of power supply
channel 1 is off
Power supply channel 1 outputs
an alarm signal
Power supply channel 1 is in
the OVP status
Power supply channel 1 is in
the CC mode
Power supply channel 1 in
the CV mode

0: Inactive status

1: Active status

Non-control power supply

CV

CC

OVP

Alarm

Power off

PA-B

○

○

○

○

×

PD-A

With option

×

×

×

×

×

PD-AD

Without option

○

○

×

×

×

PS

○

○

○

○

○

PT

○

○

○

○

×

O: Functions provided, x: functions not provided
35

2. Inquiry about set value of data setting command
The data setting commands 1 to 18 shown above also serve as
set value inquiry commands if question marks "?" are added tothe end of the commands. (The output may be in the off statusactually, depending on pressing the OUTPUT OFF key or an error
in the power supply unit.)
The format of the response is the same as that of the settingcommand and parameter. However, the command (with noparameter) is only returned if the parameter is not set in thatcommand. When SELECT 0 is specified for commands 2 to 7,
the returned command has no parameter. Specify SELECT 1 or
SELECT 2 and make an inquiry for each channel.
NOTE: If data is requested (by specifying the talker) without executing
a data request command, the GP-600B sends characters"ERROR".

36

6) Service requests
A service request is issued when either of the following conditions
takes place in a mode other than the listen-only mode.
However, the service requests in CV or CC operation after output
is turned on are not issued for the period specified with the
MTIME command.
1: OVP, alarm or power switch Off status takes place in the
power supply unit.
2: The CH1 power supply unit enters the CV operation state.
(May be ignored if the CV state is shorter than 100 ms.)
3: The CH2 power supply unit enters the CV operation state.
(May be ignored if the CV state is shorter than 100 ms.)
4: The CH1 power supply unit enters the CC operation state.
(May be ignored if the CV state is shorter than 100 ms.)
5: The CH2 power supply unit enters the CC operation state.
(May be ignored if the CV state is shorter than 100 ms.)
6: GP-IB command error(This error occurs when an unauthorized command or a
misspelled command is issued.)
7: GP-IB command error(This error occurs when the command has an invalid
parameter or format.) *1
8: GP-IB run error(This error occurs when a command that cannot be
executed is specified.)
9: The OUTPUT OFF key is pressed.
(Only when either the output voltage, current or output is set)
※1 The third and lower decimal places of the parameter are rounded up.
Therefore, no parameter error occurs even if the third and lower
decimal places are input.

37

Status Byte
1 to 5: 40H to 5FH(010XXXXXB)

Set to 1 when CH1 enters the CV mode
Set to 1 when CH2 enters the CV mode
Set to 1 when CH1 enters the CC mode
Set to 1 when CH2 enters the CC mode
Set to 1 when OVP,alarm or
power switch Off state takes place

6: 61H (01100001B)
7: 62H (01100010B)
8: 68H (01101000B)
9: 78H (01111000B)
It is possible to check the operation status using the STATUS?
command in the condition of 1.
Non-control power supply

CV

CC

OVP

Alarm

Power off

PA-B

○

○

○

○

×

PD-A

With option

×

×

×

×

×

PD-AD

Without option

○

○

×

×

×

PS

○

○

○

○

○

PT

○

○

○

○

×

7) Device clear
The GP-600B clears the communication buffer when it receives adevice clear command. Note that it does not clear the commandparameters or status byte in other cases.
8) Listen-only mode
The GP-600B enters the listen-only mode when the address
switches are set or the LISTEN command is sent after it is turned on.
In the listen-only mode, the GP-600B executes all commands,
regardless of the address, and accordingly control of several units
is enabled. However, service request issuing and data transmission
are disabled. Thus, the controller cannot check the commanderrors or the status of the power supply units.
38

6-5. Simple USB (Virtual COM Port)
With a built-in USB - serial converter (FT232BM made by FTDI ), theGP-600B may utilize existing RS232C communication software
using the USB port of the PC as a virtual COM port. It is necessary
to install the device driver in the PC for using the RS232C
communication software.
Download the virtual port driver for the FT232BM (VPC Driver)from the FTDI homepage (http://www.ftdichip.com/) according to
the PC in use, store it in an appropriate folder, and unfreeze it.
When the GP-600B is connected with the PC, the PC detects it asa new device and the driver install wizard activates. Specify thefrozen folder. For details, refer to the FTDI homepage. The
installation procedures may be downloaded.
Port setting
Baud rate: 9600bps

Data bit:8

Parity: NoneStop bit:1

Flow control : NoneNOTES:- Note that the SRQ, TALK, LISTEN and REN status indicator LEDs
on the panel are not lit while the simple USB port is being used.
- We are not support the FTDI device driver.

39

6-6. Total System Adjustment
Adjustment
For controlling the power supply units using the GP-600B,
preliminary adjustment is needed to obtain necessary accuracy.
- Aging
Before starting adjustment, connect the GP-600B with the power
supply units to be controlled for aging, which should be done for
30 minutes or more.
- Offset adjustment
Output of power supply

GP-IB input

Set 1% output of the FS voltage (current) through the GP-IB bus,
and adjust the offset so that output of the controlled power supply
becomes 1% of the FS voltage (current) with the semi-fixed 0V
control of each channel on the GP-600B panel.
Use the variable resistor 7 on the panel to adjust the voltage offset
of CH1 A.
Use the variable resistor 10 on the panel to adjust the voltage
offset of CH1 B.
Use the variable resistor 13 on the panel to adjust the voltage
offset of CH2 C.
Use the variable resistor 16 on the panel to adjust the voltage
40

offset of CH2 D.
- Full scale (FS) adjustment

Output of power supply

GP-IB input

Set the FS output voltage (current) of the power supply units to becontrolled through the GP-IB bus, and adjust the FS values withthe semi-fixed variable resistors on the GP-600B panel. The FS
variable resistor of each output has COARSE and FINE controls.
Use the variable resistors 8 and 9 on the panel to adjust the FS
voltage of CH1 A.
Use the variable resistors 11 and 12 on the panel to adjust the FS
voltage of CH1 B.
Use the variable resistors 14 and 15 on the panel to adjust the FS
voltage of CH2 C.
Use the variable resistors 17 and 18 on the panel to adjust the FS
voltage of CH2 D.

41

7. OUTSIDE DIMENSIONSLISTEN

124
134

TEXIO

10
70

5.3

350
363.1

42

7F Towa Fudosan Shin Yokohama Bldg.
2-18-13, Shin Yokohama, Kohoku-ku,Yokohama, Kanagawa, 222-0033 Japan
http://www.texio.co.jp/