Get wired - Pinout and description of HP 4S Scanner connector.

HP 4S Scanner connector


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9 pin D-SUB connector  at the scanner
Pin Name Dir Description
1 CD <-- Carrier Detect
2 RXD <-- Receive Data
3 TXD --> Transmit Data
4 GND --- System Ground
5 CTS <-- Clear to Send
6 DSR <-- Data Set Ready
7 RI <-- Ring Indicator
8 RTS --> Request to Send
9 DTR --> Data Terminal Ready

Note: Direction is DTE (Computer) relative DCE (Scanner).

Source: HP 4S Scanner pinout at The Pin-Out directory