
MGate MB3000 User’s Manual Hardware: MB3270, MB3270I
Pin Assignments
DB9 (Male)
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).
Pin RS-232
RS-422
RS-485 (2W)
Power Input, Relay Output
V2+ V2-
V1+ V1-
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