Rockwell Automation T7150A Regent+Plus Communications Modules RS-232, RS-422 and RS-485 - Manual (Page 13)

Communications Modules (T7150A)
P D - 7 0 0 2 M a r - 0 6
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Regent. With each communications module’s jumper settings
the same, module replacement is simpler. A single spare
module can replace any communications module without the
need to position the jumpers specifically for “end” or “middle”
Regents before replacement. Refer to the communications
port pin numbers shown in Figure 7 to determine the proper
external connection of the resistors.