3-30 L90 LINE CURRENT DIFFERENTIAL SYSTEM – INSTRUCTION MANUAL
WIRING CHAPTER 3: INSTALLATION
3
Figure 3-27: RS232 front panel port connection
3.3.9 CPU communication ports
3.3.9.1 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.
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