Rockwell Automation T7150A Regent+Plus Communications Modules RS-232, RS-422 and RS-485 - Manual (Page 7)

Communications Modules (T7150A)
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configurations, one using RS232 connections for short
distances and the other using RS422 connections for longer
distances. Figure 4 illustrates multidrop connections between
2 or more Regents and a PC or other communications device
supporting Regent R2 or Modbus protocols. Figure 5
illustrates multidrop connections between 2 or more Regents
using the Guarded Peer-Link protocol.
Figure 3. Point-to-Point Communications.