MODEL: GR8-EM
Communication Adaptor GR8 Series
Ethernet/RS-485 Adaptor(Modbus use)
Functions & Features• Bidirectional protocol converter for Modbus/TCP (Ethernet)
and Modbus RTU (RS-485)• Fast response time thanks to the Cache function• Available the type designed to connect to DL8 and R8series modules
27(1.06)115(4.53)

73(2.87)
mm (inch)

MODEL: GR8–EM–[1]-R
ORDERING INFORMATION• Code number: GR8–EM-[1]-R
Specify a code from below for [1].
(e.g. GR8-EM-D-R)[1] INSTALLATION
S: Single Use
D: Coupled with DL8* The internal bus of DL8 is not connected although coupledwith DL8.

•Ethernet: RJ-45 connector
Housing material: Flame-resistant resin (black)
Isolation: Ethernet to RS-485 to power supply to FE1
DIP SW Setting: Selection of IP Address andMaintenance/Normal mode
Configurator (IP Address and baud rate)
Settings from Web browser (provided by user)
Compatible terminal, browser
Windows PC (Windows 7, 8.1, 10):
Internet Explorer 11.0.47
Firefox 62.0.3
Chrome 69.0.3497.100
Edge 44.17763.1.0
Smart Phone, Tablet PC (iOS 11.4.1, Android 8.0.0)
Safari 11.4.1
Chrome 69.0.3497.100
Status indicator LED: RUN, ERR, RD, SD, LINK, LK100■ Modbus RTU•Supported Commands
Read Coil Status (01)Read Input Status (02)Read Holding Registers (03)Read Input Registers (04)Force Single Coil (05)
Preset Single Register (06)Diagnostics (08)Fetch Comm. Event Counter (11)Fetch Comm. Event Log (12)Force Multiple Coils (15)Preset Multiple Registers (16)
Report Slave ID (17)■ Cache Commands
Following commands are valid for Cache function.
Read Coil Status (01)Read Input Status (02)Read Holding Registers (03)Read Input Registers (04)
(Up to 100 queries)

POWER INPUTDC Power
R: 24 V DC
(Operational voltage range 24 V ±10 %, ripple 10 %p-p max.)

GENERAL SPECIFICATIONSConnection•Power input: Euro type connector terminal
Applicable wire size: 0.2 - 2.5 mm2Stripped length: 7 mm
•RS-485: Tension clamp (Front Twin connection)
Applicable wire size: 0.2 - 1.5 mm2Stripped length: 10 mm
GR8-EM SPECIFICATIONS

MG CO., LTD.
www.mgco.jp

ES-8621 Rev.9 Page 1/7

MODEL: GR8-EM
Ethernet, Modbus/TCP

STANDARDS & APPROVALS

Standard: IEEE 802.3u
Transmission type: 10BASE-T, 100BASE-TX
Transmission speed: 10 / 100M bps(Auto Negotiation)
Protocol: TCP/IP
Number of connections: 8
Transmission media:
10BASE-T (STP cable; Category 5)
100BASE-TX (STP cable; Category 5e)
Maximum segment length: 100 meters
Communication configuration: with Web browser
IP address: 192.168.0.1 (factory default setting)Subnet mask
Default gateway
Port No.: 502 (factory default setting)User name, password
Modbus exception response
Connection time out

EU conformity:
EMC Directive
EMI EN 61000-6-4
EMS EN 61000-6-2
RoHS Directive

RS-485, Modbus-RTUProtocol: Modbus RTU
Configuration: Bus type multi-drop
Standard: Conforms to TIA/EIA-485-A
Communication: Half-duplex, asynchronous, no procedure
Transmission media: Shielded twisted-pair cable (CPEV-S
0.9 dia.)
Communication configuration: with Web browser
Baud rate: 2.4, 4.8, 9.6, 19.2, 38.4(*), 57.6, 115.2 kbps
Parity bit: None, Odd(*), Even
Stop bit: 1(*), 2
Read response timeout: 1000 msec.(*), 10 - 10 000 msec.
Write response timeout: 1000 msec.(*), 10 - 10 000 msec.
Cache function: Enabled(*), disabledInter-frame interval: 10 msec.(*), 0 - 500 msec.
(*)Factory default setting
Terminating resistor: Built-in 110 Ω (DIP Switch, default:enabled)

INSTALLATIONPower consumption• DC: ≤ 1.5 W 24 V DC
Operating temperature: -10 to +55°C (14 to 131°F)
Operating humidity: 10 to 90 %RH (non-condensing)
Mounting: DIN rail
Weight: 120 g (0.26 lb)

PERFORMANCE
Insulation resistance: ≥ 100 MΩ with 500 V DC
Dielectric strength: 1500 V AC @ 1 minute (Ethernet to RS485 to power to FE1)
GR8-EM SPECIFICATIONS

MG CO., LTD.
www.mgco.jp

ES-8621 Rev.9 Page 2/7

MODEL: GR8-EM
BASIC CONFIGURATIONS■ COUPLED WITH DL8Make sure to install the unit coupled with DL8 at the end of all the other modules. With the unit installed between DL8 and I/O modules,
I/O modules after the unit can not perform internal communication or the power can not be supplied to these I/O modules.
Web-enabled
Remote Terminal Unit

Ethernet/RS-485 Adaptor

I/O Modules
DL8GR8−EM

Protective Cover• HOW TO INSTALL
Confirm that the locking clamps of the unit are set. Insert the unit straight in perpendicularly to the rail such that the grooves of theunit and the module on the immediate left engage each other. (A & B in the below figure)AB■ SINGLE USE• HOW TO INSTALLA) Hang the upper hook at the rear side of unit on the DIN rail. Push in the lower in keeping pressing the unit to the DIN rail.
B) To remove the unit, push down the DIN rail adaptor using a minus screwdriver. Pull out the lower part of the unit.
Remove the upper part from the DIN rail.

Note: When the unit is mounted on a DIN rail attached on the wall surface in vertical direction, use of an attachment
plate to prevent the module from sliding down is recommended.

GR8-EM SPECIFICATIONS

MG CO., LTD.
www.mgco.jp

ES-8621 Rev.9 Page 3/7

MODEL: GR8-EM
EXTERNAL VIEW
■ FRONT VIEW

■ RIGHT SIDE VIEW
Status Indicator LED

Function Setting DIP SW
SW112345678ONConnector for
RS-485 Communication
RJ-45 Connector for
Ethernet

Terminating Resistor
Setting SW

Connector forPower Supply■ STATUS INDICATOR LED
LEDColor

Light

Module Status

Blinking (1-sec cycle)

Normal mode

Blinking in low speed (2-sec cycle)
RUNGreenERRRDSDRedGreenGreenLINKGreen

LK100

Green

Maintenance mode (with SW1-2 ON)
Error (device error when the unit wouldn't recover even after power
Blinking in high speed (0.4-sec cycle)
reactivation)
OFF
Power is oﬀ or device error
ONONONON
BlinkingOFFON
OFF

Data error from RS-485 device
Receiving data from the paired RS-485 station
Sending data to the paired RS-485 station
Being linked with 10BASE or 100BASE
Sending/receiving data
No link detected
Being linked with 100BASE
Being linked with 10BASE or Not linked■ DIP SW SETTING• IP Address
SW1-1OFF (*)

ON

Mode
Normal mode

Function
Set with configurator
When starting up with the SW ON, the unit temporarily operates by the factory default settings ofnetwork configuration, user ID and password.
Factory default mode The stored settings, however, are maintained and the unit returns to the original settings upon
restarting at normal mode. When network settings are changed during factory default mode, thechanged settings are stored.

• Maintenance mode
SW1-2
OFF (*)Mode
Normal modeON

Maintenance mode

Function
Normal operation
Stop output(Modbus function 05, 06, 15, 16 are disabled)

GR8-EM SPECIFICATIONS

MG CO., LTD.
www.mgco.jp

ES-8621 Rev.9 Page 4/7

MODEL: GR8-EM■ TERMINATING RESISTOR SW• Terminating resistor
TERM
INCORPORATED TERMINATING RESISTOROFF
Disabled
ON (*)
Enabled(*)Factory default setting■ RS-485 CONNECTOR TERMINAL ASSIGNMENT
Unit side connector: MC1,5/5-GF-3,5(Phoenex Contact)
Cable side connector: TFMC1,5/5-STF-3,5(Phoenex Contact)

54321No.

ID

FUNCTION

54321FESH
DGDBDAFESHIELD
DGDBDA■ POWER SUPPLY TERMINAL ASSIGNMENT
Unit side connector: MSTB2,5/3-G(Phoenex Contact)
Cable side connector: MSTB2,5/3-ST(Phoenex Contact)

1No.

ID

FUNCTION

123(+)(–)
FE1

Power supply 24V (+)
Power supply 24V (–)
Power supply earth

23

COMMUNICATION CABLE CONNECTIONS* Terminating

GR8-EM

RS-485 devices

DA
DB
DGSH
FE

DA
DB
DG
SLD
FGResistor* Turn the terminating resistor SW “ON” to use the incorporated terminating resistor.

EXTERNAL DIMENSIONS unit: mm [inch]■ COUPLED WITH DL8■ SINGLE USE

3 (.12)55 (2.17)

73 (2.87)[4 (.16)]24 (.94)

3 (.12)55 (2.17)[5 (.20)]

6(.24)

7(.28)

73 (2.87)
24 (.94)

115 (4.53)
6(.24)
7(.28)

7(.28)

6(.24)

115 (4.53)

1

GR8-EM SPECIFICATIONS

MG CO., LTD.
www.mgco.jp

ES-8621 Rev.9 Page 5/7

MODEL: GR8-EM
SCHEMATIC CIRCUITRY & CONNECTION DIAGRAM
FUNCTIONSETTING SW

LEDIsolation
POWER+–
FE1

Power Circuit(non isolated)

RJ-45 CONNECTOR
ControlCiruict

DA
DB
DG
SH
FE

Isolation

To other
RS-485 devices

SYSTEM CONFIGURATION EXAMPLES
Devices other than the GR8-EM in below provided by the user.
■ COUPLED WITH DL8HubDL8 Client
I/O modules
DL8GR8-EM

RS-48524V DCpower
Remote I/O modules

Note: It is not available to supply the power via DL8.
Supply the power with the connector for power supply.

GR8-EM SPECIFICATIONS

MG CO., LTD.
www.mgco.jp

ES-8621 Rev.9 Page 6/7

MODEL: GR8-EM■ SINGLE USE

PC Recorder(model: MSR128, MSR2K)

STP Cable
Hub
STP Cable(10BASE-T, 100BASE-TX)
Communication Adaptor(model: GR8-EM)

Communication Adaptor(model: GR8-EM)

R3, R5, R6, R7 Series
RS-485
RS-485Interface Modules(model: R3-NM1, R5-NM1,R6-NM1, R6-NM2)
Remote I/O (R7M etc.)
Max 31 nodes

Specifications are subject to change without notice.

GR8-EM SPECIFICATIONS

MG CO., LTD.
www.mgco.jp

ES-8621 Rev.9 Page 7/7