Technical Information

Commubox FXA195
Intrinsically safe interface for Smart transmitters.
Converts HART protocols to USB signals.

Application

Your benefits

Commubox FXA195 connects intrinsically safe Smarttransmitters with HART protocol to the USB port of apersonal computer or laptop. This makes the remote
operation of the transmitters possible with the aid of theEndress+Hauser FieldCare and ReadWin operating
programs.

• Remote commissioning of field devices directly fromthe control room or anywhere in the current loop.
• Full support for FieldCare and ReadWin operating
programs.
• For connection to intrinsically safe circuits(4...20 mA).
• Reactionless in accordance with IEC 61508 forconnection to 4...20 mA SIL 2 loops.
• Switchable communication resistor

Commubox FXA195 is powered by means of the USB
port. It is supplied with a 4mm/2mm adapter cable.

TI00404F/04/en
71155634

Commubox FXA195

Function and system design
Measuring system

In HART operation, a transmitter is operated by means of a minimum load of 250 .
Note!
Please observe the max. total load of the Smart transmitter!
Note!
The communication resistor (270 ) integrated in Commubox should not be connected in parallel to a power
supply point greater than 15 V. If the communication resistor is used, it should always be looped into the4...20 mA circuit
Note!
Once Commubox FXA195 has been used in a non-Ex installation, it should never be used in an
Ex installation, as there is a danger that the protective circuits have been inadvertently overloaded and no longer function correctly. See also Safety Instructions XA336F/00/a3.

1OffUSB

FieldCare/ReadWin

FXA195+I/O card
PLC/DCS
passive+–+270:= active––Fielddevice(passive)

Power supply*

2On

FieldCare/ReadWin

FXA195+= activeUSB

I/O card
PLC/DCS
passive+–+––

Field
device(passive)

Power supply*

3OffUSB

FieldCare/ReadWin

FXA195+I/O card
PLC/DCS
passive–++ 250:= active––

Field
device(passive)

Power supply*

4Off+= active

FXA195USB

FieldCare/ReadWin

I/O card
PLC/DCS
passive+–+250:––

Field
device(passive)

Power supply**Power supply = RNS221, RN221N-A, RN221N-B (Ex), RMA422, RMA42

Fig. 1: Operation of Commubox FXA195 in a loop powered by a transmitter power supply
m From the controlroom via the communication sockets of the transmitter power supply
n In the loop (communication resistor of FXA195 on)o Via a  250  resistor (recommended 270 – 330 ) in the loop
(communication resistor of FXA195 off)p In the loop (loop resistance  250 )

2Commubox FXA195

Measuring system continued

1On
I/O card
PLC/DCS
active orpassive++––OffUSB++

250:––Off+

USB

Field
devicepassiveor active

FieldCare/
ReadWin

FXA195

3I/O card
PLC/DCS
active orpassive

FieldCare/ReadWin

FXA1952I/O card
PLC/DCS
active orpassive

USB

Field
devicepassiveor active

FieldCare/ReadWin

FXA195+
250:––Field
devicepassiveor active

Fig. 2: Operation of Commubox FXA195 in a control loop (I/O card active/device passive or vice versa)
m In the loop (communication resistor of FXA195 on)n Via a  250  resistor (recommended 270 – 330 ) in the loop(communication resistor of FXA195 off)o In the loop (loop resistance  250 )

Input/output
USB port

Personal computer  Commubox FXA195 = USB signal as per USB specification.

HART interface

Measuring device(s)  and Commubox FXA195 = HART signal as per HART specification.

Power supplyConnection• For computer: USB port
• For transmitter: adapter bushing, 4 mm, independent of polarity• Adapter cable 4mm/2mm supplied

Supply voltage

Voltage range: from the USB port of the personal computer, 5VDC.
Current consumption: < 20 mA

Intrinsically safe signal circuit

BVS 05 ATEX E 039
For connecting an intrinsically safe circuit with explosion protection [EEx ia] IIC with the following maximum
value: connection voltage up to 30 VDC.

3Commubox FXA195

Operating conditions: Environment
Permitted ambienttemperatures• Nominal operating range: -20 °C ... +50 °C• Storage temperature: -40 °C ... +85 °C• Humidity: 0 % ... 95 % (no condensation)

Electromagnetic
compatibility (EMC)

Interference Emission to EN 61326, Electrical Equipment Class B. Interference immunity to EN 61326.

Applicationin conjunction with protection
functions

Commubox FXA195 can be connected reactionless to protection functions that are graded as SIL 2 inaccordance with IEC 61508.
SFF11)

60%

SFF (safe failure fraction) = proportion of safety-related faults

TI1

PFDavg2

1 year

1.23 x 10-6

5 years

6.13 x 10-610 years

1.23 x 10-51)

TI = test interval between function tests of the protection function (in years)

2)

PFDavg = average probability of dangerous failure on demand

Mechanical construction
Design, dimensions

Housing dimensions: 143 x 60 x 30 mm.

Weightapprox. 200 g

Certificates and approvals
CE markThe Commubox meets the legal requirements of the EC directives.
Endress+Hauser confirms that the device has been successfully tested by applying the CE label.

Ex-approval

See ordering information.

External standards
and guidelines

Other standards and guidelines that were taken into account when designing and developing FXA195.
EN 60529
Ingress protections for housing (IP code)
EN 61010
Safety requirements for electrical equipment for measurement, control and laboratory use
EN 61326
Interference emission (Class B operating equipment), interference immunity (Appendix A - industrial sector)

4Commubox FXA195

Ordering information
Commubox FXA195

10Approval:
GPSY

20ATEX II (1)GD EEx ia IIC
FM IS CL.I,II,III Gr.A-G
CSA IS CL.I,II,III Gr.A-G
Special version

Additional Option:
19FXA195-

Basic version
Special version
Complete product designation

System requirements
Hardware and software

HardwareMinimum

Endress+Hauser operating program

Processor

Pentium 500 MHz or higher

FieldCare

InterfaceUSB 1.1, 2.0, 3.0

HART OPC server

Drives

CD-ROM drive

ReadWin 2000

Operating system

EditionService Pack

Bits

Windows XP

Professional

SP2, SP3

32 BitWindows Server 2000

Standard R2Enterprise R2

SP2SP232 Bit
32 BitWindows Vista

UltimateBusinessEnterprise

SP1, SP2
SP1, SP2
SP1, SP232 Bit
32 Bit32 BitWindows 7

Professonal
Ultimate
Enterprise

No SP, SP1
No SP, SP1
No SP, SP1

32 Bit/64 Bit
32 Bit/64 Bit
32 Bit/64 Bit

Installation
Scope of delivery

A CD-ROM with the following programs is supplied with Commubox FXA195:• USB drivers - these are automatically installed by means of hardware detection.
• PreInstaller - you can use this program to install the USB drivers manually. To do so, you must first start
the executable program (.exe) from the CD-ROM, follow the installation instructions and then connect theCommubox to the personal computer.

Installing the USB driver

Note!
Please note that you require Windows Administrator rights!
1.

Insert the FXA195 CD-ROM in the CD-ROM drive of your computer2.

Connect the Commubox FXA195 to a free USB interface on your computer

3.

Follow the instructions of the set-up program which now appears

5Commubox FXA195

Documentation
Supplementary
documentation

TI00404F/00/en/13.11
71155634
FM9.0• Safety Instructions XA336F/00/a3