Emerson FB3000 Instruction Manual page 35

Port
COM2
COM3
(Isolated RS-485 only)
COM4
(Isolated RS-485 only)
Use FBxConnect software to choose the port usage (RS-232 or RS-485) for COM1 and COM2.
Note
Older standards refer to RS-485 (4-wire) as RS-422.
Figure 2-19. Configuring a Port in FBxConnect
Installation
Emerson FB3000 RTU Instruction Manual
Pin RS-232
5 GND
6 TXD2
7 RTS2
8 RXD2
9 CTS2
10 GND
11
12
13
14
15
16
17
18
19
20
4-Wire RS-485 2-Wire RS-485
GND GND
TX2+ TX2+
TX2– TX2–
RX2+
RX2–
GND GND
T3+
T3– (ISO GND)
TX/RX+3
TX/RX3–
T4+
T4– (ISO GND)
TX/RX4+
TX/RX4–
D301851X012
October 2022
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