Emerson FB3000 User Manual

FB3000 RTU Instruction Manual
D301851X012
November 2023
Installation 45
2.11.6 Connecting a serial port to Multiple Rosemount 4088B
Transmitter (Multi-Drop) (3SRSG4)
You can wire any of the four serial ports for communication with multiple multi-dropped
Rosemount 4088B transmitters using RS-485 (2-wire).
When wiring to multiple Rosemount 4088B transmitters (multi-drop) using 2-wire RS-485,
follow this configuration:
Figure 2-35. COMn RS-485 (2-wire) Connection to Multiple 4088B Transmitters (Multi-
Drop)
1
Enable AC termination using switches on last multi-dropped 4088B transmitter
2
RS-485 bus; twisted pair required
3
Up to ten 4088B transmitters allowed per port. All transmitters require an
external power supply. When communicating with more than six 4088Bs at 9600
baud, update times exceed once a second.
4
Connect cable shields to suitable Instrument Earth connection point
Notes
 For COM1, n=1, pin numbers as follows: a=1, b=2, c=3, d=4, e=5
 For COM2, n=
2, pin numbers as follows: a=6, b=7, c=8, d=9, e=10
 For COM3, n=3, pin numbers as follows: a=11, b=12, c=13, d=14, e=15
 For COM4, n=4, pin numbers as follows: a=16, b=17, c=18, d=19, e=20

Emerson FB3000 Specifications

General

Brand	Emerson
Model	FB3000
Category	Touch terminals
Language	English