Cerabar M HART Wiring
Endress+Hauser 21
4.3 Connecting Commubox FXA191/FXA195
P01-PMx4xxxx-04-xx-xx-xx-015
Fig. 23: ➀ Personal computer with Endress+Hauser operating program. ➁ Minimum total resistance 250 Ω.
The Commubox can be connected anywhere along the 4 to 20 mA cable.
4.3.1 Connecting Commubox FXA191
The Commubox FXA191 connects intrinsically safe transmitters to a computer's serial interface
(RS 232C) using the HART protocol. This allows remote operation of the measuring transmitter
using Endress+Hauser operating programs. The Commubox is supplied with power through the
serial interface. The Commubox is also suitable for connection to intrinsically safe circuits. → See
Technical Information TI404F for further information.
4.3.2 Connecting Commubox FXA195
The Commubox FXA195 connects intrinsically safe transmitters to a computer's USB port using the
HART protocol. This allows remote operation of the measuring transmitter using Endress+Hauser
operating programs. The Commubox is supplied with power through the USB port. The Commubox
is also suitable for connection to intrinsically safe circuits. → See Technical Information TI237F for
further information
4.4 Connecting the measuring unit
4.4.1 Supply voltage
!
Note!
• When using the measuring device in hazardous areas, installation must comply with the
corresponding national standards and regulations and the Safety Instructions or Installation or
Control Drawings.
• All explosion protection data are given in separate documentation which is available upon
request. The Ex documentation is supplied as standard with all devices approved for use in
hazardous areas.
Supply voltage
• For non-hazardous areas: 11.5 to 45 V DC
4.4.2 Cable specification
• Endress+Hauser recommends using twisted, shielded two-wire cables.
• Terminals for wire cross-sections: 0.14 to 2.5 mm
2
• Cable outer diameter: 5 to 9 mm
1 2
+ –
3
Zero
Damping
on off
Span
Display
4…20 mA
➀
➁
Commubox
FXA191/FXA195
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