Moxa Technologies MGate MB3000 - Pin Assignments; DB9 (Male); Terminal Block (RS-422, RS-485); Power Input, Relay Output

MGate MB3000 Modbus Gateway User Manual
35
8. 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 (4W)
RS-485 (2W)
1
DCD
TxD-
–
2
RxD
TxD+
–
3
TxD
RxD+
Data+
4
DTR
RxD-
Data-
5
GND
GND
GND
6
DSR
–
–
7
RTS
–
–
8
CTS
–
–
9
–
–
–
Terminal Block (RS-422, RS-485)
The MB3170 and MB3170I have a terminal block connector for RS-422 and RS-485 signals.
Pin
RS-422/
RS-485 (4W)
RS-485 (2W)
1
TxD+
–
2
TxD-
–
3
RxD+
Data+
4
RxD-
Data-
5
GND
GND
Power Input, Relay Output
The MGate MB3170/MB3270 gateways have dual power inputs for redundancy and a relay output for event
warnings.
V2+ V2- V1+ V1-
Shielded
Ground
DC Power
Input 1
DC Power
Input 1
Relay
Output
Relay
Output
DC Power
Input 2
DC Power
Input 2