11
6.3.1. RS-232 Control (DB-9) Connection
To eliminate the need to make crossover or null modem cables, the RS-232 pinouts can be
configured for DCE or DTE. Set switch 2 to DCE if the connected device is DCE, and to DTE if
the connected device is DTE.
Typically the control system will be DTE and the controlled device will be DCE, however,
devices may vary. Refer to the manual for the connected devices for proper pinout
configuration.
2
1
2
1
2
1
2
1
PIN FUNCTION
2
RxD (Data Receive)
3
TxD (Data Transmit)
5
GND
PIN FUNCTION
2
TxD (Data Transmit)
3
RxD (Data Receive)
5
GND
2
3
5
FIGURE 10: RS-232 Modes and Connections
DTE Mode
RS-232 DB-9 Pinouts
DCE Mode
TRANSMITTER
RECEIVER