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Rosemount Tank Radar REX
Chapter 6 The Field Communication Unit
6-2
Installation Manual
308014EN, Edition 4
May 2013
6.2 Communication Ports
The Field Communication Unit has six connections for communication
interface boards, X1 to X6. The connections can be individually
configured as either Group Bus or Field Bus ports. There can be
maximum four Group Buses or four Field Buses at the same time.
Maximum configuration can be 2+4, 3+3 or 4+2 buses of each kind.
However, connections X5 and X6 are never configured as Field Bus
ports, while the X1 and X2 connections are never configured as Group
Bus ports.
As standard the Field Communication Unit is delivered with six FCM
interface boards for four Field Bus ports and two Group Bus ports.
The table below shows the maximum configurations of an extended
FCU:
Table 6-1. Communication ports.
6.2.1 RS232 communication
There are two jumper connectors delivered with each unit. These can be
connected to the X5 and/or X6 for RS-232C Group Bus communication.
See Figure 6-2.
Figure 6-2. FCU Bus Ports
Ports X1 X2 X3 X4 X5 X6
Alternative 4+2
FB FB FB FB GB GB
Alternative 3+3
FB FB FB GB GB GB
Alternative 2+4
FB FB GB GB GB GB
X1
X2
X3
X4
X5
X6
FCU_BusPorts.eps
Jumper for
RS232C
TRL/2 Bus
Interface boards,
FCM boards