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HP iPaq 22 pin

pinout

used in 38 model and newer?

22 pin male Himalaya special
22 pin male Himalaya special connector  at the PDA (keypad up)
PinSignalDescription
1,2,3,4V_ADP   
5Reserved Do Not Use 
6DCD RS-232 Data Carry Detect 
7RXD RS-232 Receive Data 
8TXD RS-232 Transmit Data 
9DTR RS-232 Data Terminal Ready 
10,15,22GND Ground 
11DSR RS-232 Data Set Ready 
12RTS RS-232 Request To Send  
13CTS RS-232 Clear To Send  
14RING RS-232 Ring 
16,18,20N.C. Do Not Use 
17USB Detect Detect 
19UDC+ USB positive data signal 
21UDC- USB negative data signal 

Source:www.pinouts.ru