Serial Connector - Com4 - Honeywell Thor VX9 User Manual

Serial Connector - COM4

Note: Pin 9 of the COM port can be switched between +12V and RI. See
7 - 6
Pin Signal Description
1 DCD Data Carrier Detect – Input
2 RXD Receive Data – Input
3 TXD Transmit Data – Output
4 DTR Data Terminal Ready – Output
5 GND Signal/Power Ground
6 DSR Data Set Ready – Input
7 RTS Request to Send – Output
8 CTS Clear to Send – Input
9 RI Ring Indicator – Input (default)
or or
+12VDC Power – 400mA max
VMT Manager (page 4-10).