Serial Port - Honeywell MX3PLUS Reference Manual

Serial Port

RS232 connection is made through a labeled RS-232 Serial Port if installed. The connector is an industry-standard RS232. The
connector is a PC/AT standard 9-pin "D" male connector.
2-6
Pin Signal
1 DCD
2 RXD
3 TXD
4 DTR
5 GND
6 DSR
7 RTS
8 CTS
9 RI or +5 VDC
Description
Carrier Detect
Receive Data - Input
Transmit Data - Output
Data Terminal Ready
Signal/Power Ground
Data Set Ready
Ready to Send
Clear to Send
Ring Indicator - Input