User`s manual

5
5
Chapter 5 Pin Assignments
The MGate MB3000 uses DB9 (male) serial ports to connect Modbus RTU or ASCII devices.
Each port supports three serial interfaces: RS-232, RS-422, and RS-485 (both 2 and 4-wire).
DB9 (Male)
15
69
Pin RS-232
RS-422 and
RS-485 (4-wire)
RS-485
(2-wire)
1 DCD TxD-(A) ---
2 RxD TxD+(B) ---
3 TxD RxD+(B) Data+(B)
4 DTR RxD-(A) Data-(A)
5 GND GND GND
6 DSR --- ---
7 RTS --- ---
8 CTS --- ---