Connecting To Com2 And Com3 - Emerson FB1100 Instruction Manual

When connecting COM1 to another device using RS-485 (2-wire), use a cable with configurations
as shown in
Figure 2-29: Connecting a Device to COM1 Using RS-485 (2-wire)
1
2
Regardless of the interface standard (RS-232, RS-485 [2-wire] or RS485/422 [4-wire]), you must
use FBxConnect to configure the port for proper usage.
2.13.2

Connecting to COM2 and COM3

COM2 and COM3 operate identically. Each can be configured for either RS-232 or RS-485 (2-wire)
communication.
When connecting COM2 or COM3 to an RS-232 port on another device (a PC or another
controller/flow computer) use a cable with configurations as shown in
Note
Neither COM2 nor COM3 has its own GND terminal. Use either GND terminal on the COM1
terminal block.
Installation
Figure 2-29:
RS-485 (2-wire) port (COM1) on FB device
RS-485 (2-wire) port on external device
Emerson FB1100 Flow Computer Instruction Manual
D301752X012
August 2020
Figure 2-30.
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