Cpu Communication Ports - GE B90 Instruction Manual

CHAPTER 3: INSTALLATION WIRING
Figure 3-24: RS232 front panel port connection
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3.3.7 CPU communication ports

3.3.7.1 Overview
In addition to the front panel RS232 port, there is a rear RS485 communication port.
The CPU modules do not require a surge ground connection.
B90 LOW IMPEDANCE BUS DIFFERENTIAL SYSTEM – INSTRUCTION MANUAL 3-27