Campbell Scientific SDM-SIO1 Serial Input/Output Module - Manual (Page 18)

SDM-SIO1 Serial Input/Output Module
3.3.5 RS-232 Wiring Example with Handshaking
1 C1
2 C2
3 C3 To logger
4 G
5 +12V
6 G 0V
7 RX-A RS-232_RX
8 CTS-B RS-232 RTS
9 RTS-Y RS-232 CTS
10 TX-Z RS-232 TX
RS-232 DCE
equipment
11 0V
DTE DCE
12 Z
13 Y
14 B
15 A
* Note CTS and RTS are optional if hardware
handshaking is not required. Not connecting the
handshaking lines will decrease the overall current
consumption of the SDM-SIO1 and the RS-232
device.
3.3.6 RS-232 Basic 3-Wire Example
1 C1
2 C2
3 C3 To logger
4 G
5 +12V
6 G 0V
7 RX-A RS-232_RX
8 CTS-B
9 RTS-Y
10 TX-Z RS-232 TX
RS-232 DCE
equipment
11 0V
DTE DCE
12 Z
13 Y
14 B
15 A
12