Campbell Scientific MD485 RS-485 Multidrop Interface User Manual

Page 66

Appendix H. MD485 Port Pin Descriptions

H-2

RS-232 CONNECTOR, 9-PIN D-SUB FEMALE

PIN I/O FUNCTION

1 +5V DCD
2 O RXD
3 I TXD
4 NC DTR
5 GND GND
6 +5V DSR
7 NC

RTS

8 O

CTS

9 NC

I = Signal Into the MD485, O = Signal Out of the MD485, NC = No
Connection

RS-485 Port

RS-485 CONNECTOR, 3-PIN TERMINAL BLOCK

PIN I/O FUNCTION

1 GND

Signal

Ground

I/O

485_IO- (A)

I/O

485_IO+ (B)

I = Signal Into the MD485, O = Signal Out of the MD485