B&B Electronics MESP211D_T - Manual - Manual (Page 67)

Appendices Vlinx MESP211 Modbus Gateway
66
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APPENDIX D: CONNECTOR PINOUTS
MESP211 SERIAL PORT PINOUTS
DB9 Male
Pin
Direction
(RS-232)
RS-232 RS-422
RS-485
4-Wire
RS-485
2-Wire
1 Input DCD RDA (-) ****
2 Input RXD RDB (+) ****
3 Output TXD TDB (+) Data B
(+)
4 Output DTR TDA (-) Data A (-
)
5 **** GND GND GND
6 Input DSR **** ****
7 Output RTS **** ****
8 Input CTS **** ****
9 **** **** **** ****