HP 4S Scanner connector

9 pin D-SUB FEMALE connector pin-out & layout

9 pin D-SUB FEMALE connector

1CD<--Carrier Detect
2RXD<--Receive Data
3TXD-->Transmit Data
4GND---System Ground
5CTS<--Clear to Send
6DSR<--Data Set Ready
7RI<--Ring Indicator
8RTS-->Request to Send
9DTR-->Data Terminal Ready
Note: Direction is DTE (Computer) relative DCE (Scanner).

Garmin GPS 7 PIN

HP48/HP95 calculator connector