Rs-232 Control (Db-9) Connection - Binary B-520-EXT-330-RS-IP Installation Manual

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.
TRANSMITTER
RECEIVER
RS-232 DB-9 Pinouts
5 3
PIN
2
FIGURE 10: RS-232 Modes and Connections
DTE Mode
1 2
1 2
FUNCTION
2 RxD (Data Receive)
3 TxD (Data Transmit)
5 GND
11
DCE Mode
1 2
1 2
PIN FUNCTION
2 TxD (Data Transmit)
3 RxD (Data Receive)
5 GND