Logic Controls PDX3 Series User Manual page 7

 Serial Interface Connector
The pin out configuration for the standard serial pole display is a DB9F connector. It
plugs directly into the serial port of the computer.
1: DCD (tied to pins 4&6)
2: NC
3: TXD from PC
4: DTR (tied to pins 1&6)
5: Ground
6: DSR (tied to pins 1&4)
7: RTS (tied to pin 8)
8: CTS (tied to pin 7)
9: +5 VDC
 Serial pass-through Interface Connectors
For pass-through models, the display cable comes with two connectors. The DB9F is to be
connected to the computer while the DB25M is for connection to the peripheral.
1: DCD (tied to pins 4&6)
2: TXD to PC
3: RXD from PC
4: DTR (tied to pins 1&6)
5: Ground
6: DSR (tied to pins 1&4)
7: RTS (tied to pin 8)
8: CTS (tied to pin 7)
9: +5 VDC
1: NC
2: TXD to peripheral
3: RXD from peripheral
4: RTS
5: CTS (tied to pin 20)
6: NC
7: Ground
8: NC
9-19: NC
20: DTR (tied to pin 5)
21-25: NC
DB9F (to
computer)
DB9F (to
computer)
DB25M (to
peripheral)
4