Rockwell Automation T7150A Regent+Plus Communications Modules RS-232, RS-422 and RS-485 - Manual (Page 2)

Communications Modules (T7150A)
2
Industrial Control Services
processor modules and combines it through a diode OR power-
sharing circuit. This ensures that if one processor module's
power supply fails, the communications module will continue
to operate by drawing power from the two remaining power
supplies, and the system's communications functions are
maintained.
Additional isolated power converters provide isolated power to
the two serial ports. This isolation provides protection from
external communications cable signal noise and grounding
from affecting module operations.
Figure 1. Block Diagram of Communications Module.
The Dual UART (universal asynchronous receiver/trans-
mitter) buffers incoming and outgoing communications
characters. The triplicated processor modules interrupt once