Cpu Communication Ports - GE b30 Instruction Manual

CHAPTER 3: INSTALLATION WIRING
Figure 3-21: RS232 faceplate port connection
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3.3.9 CPU communication ports

3.3.9.1 Overview
In addition to the faceplate RS232 port, there is a rear RS485 communication port.
The CPU modules do not require a surge ground connection.
B30 BUS DIFFERENTIAL SYSTEM – INSTRUCTION MANUAL 3-23