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Another source close to me revealed this.
IPaq Pin-Outs: (31/36/3700 Series)
Looking at plug with hooks down (female on PDA is 1 thru 12 left to right)
1 V_ADP AC adapter power in RED
2 V_ADP AC adapter power in RED
3 DTR RS-232 Data Terminal Ready
4 GND Power ground BLACK
5 CTS RS-232 Clear To Send
6 RTS RS-232 Request To Send
7 TXD RS-232 Transmit Data WHITE
8 RXD RS-232 Receive Data BROWN
9 DCD RS-232 Data Carry Detect
10 GND Power ground
11 UDC_P USB positive data signal
12 USB_N USB negative data signal
iPAQ 3800 Series Pin-outs, including 2210:
Pin 1 V_ADP RED
Pin 2 V_ADP RED
Pin 3 V_ADP RED
Pin 4 V_ADP RED
Pin 5 Reserved – Do Not Use
Pin 6 RS232 DCD
Pin 7 RS232 RXD
Pin 8 RS232 TXD
Pin 9 RS232 DTR
Pin 10 GND
Pin 11 RS232 DSR
Pin 12 RS232 RTS
Pin 13 RS232 CTS
Pin 14 RS232 RING
Pin 15 GND
Pin 16 No Connect – Do Not Use
Pin 17 USB Detect
Pin 18 No Connect – Do Not Use
Pin 19 USB – UDC +
Pin 20 No Connect – Do Not Use
Pin 21 USB – UDC -
Pin 22 GND
I know a good UK based supplier of the whole cable - just 15 miles down the road from me, very helpful. Ask me if you want to know.
I can't be held responsible if this is not right.
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