Emerson FB3000 - Page 44

FB3000 RTU Instruction Manual
D301851X012
November 2023
30 Installation
When connecting COM1 to another device using RS-485 (4-wire), use a cable with
configurations as shown in Figure 2-21:
Figure 2-21. Wiring COM1 on the CPU Module for RS-485 (4-wire)
1
RS-485 (4-wire) port on device
2
Connect cable shields to suitable Instrument Earth connection point