5 rs-232 wiring example with handshaking, 6 rs-232 basic 3-wire example, Rs-232 wiring example with handshaking – Campbell Scientific SDM-SIO1 Serial Input/Output Module User Manual
Page 18: Rs-232 basic 3-wire example
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