Emerson FB3000 Instruction Manual page 47

When connecting COM2 to an RS-485 (4-wire) port on another device use a cable with
configurations as shown in
Figure 2-24. Wiring COM2 on the CPU Module for RS-485 (4-wire)
1
2
Installation
Figure
RS-485 (4-wire) port on device
Connect cable shields to suitable Instrument Earth connection point
FB3000 RTU Instruction Manual
2-24:
D301851X012
November 2023
33