Emerson FB3000 Instruction Manual page 52

FB3000 RTU Instruction Manual
D301851X012
November 2023
Figure 2-29. Wiring COM4 on the CPU Module for RS-485 (2-wire) and Connecting to
Multiple 4088B Transmitters
1
2
3
4
Regardless of the interface standard you must use FBxConnect to configure the port for
proper usage.
38
Enable AC termination using switches on last multi-dropped 4088B transmitter
RS-485 bus; twisted pair required
Up to ten 4088B transmitters allowed per port; FB3000 only provides power for a
maximum of four transmitters. Any other transmitters require an external power
supply. When communicating with more than six 4088Bs at 9600 baud, update
times exceed once a second
Connect cable shields to suitable Instrument Earth connection point
Installation