Wallaby and Himalaya come with two connectors on the bottom. Also for MDA, XDA, Eurotel DataPhone.

This full pinout suggested for Wallaby, Himalaya, T-mobile O2 XDA, HTC Pocket PC phones. For other devices it may be little different (only USB signals are confirmed to be the same for all devices listed at the top of this page).

Pin Signal Description
1 CAR_MIC_IN Car microphone input
2 GND / SENSE Ground / chassis
3 CAR_AUDIO_R Car audio right output
4 CAR_AUDIO_L Car audio left output
5 ANALOG GND  
6 RS232_DCD  
7 RS232_CTS  
8 RS232_TXD  
9 RS232_RTS  
10 RS232_RXD  
11 RS232_DTR  
12 NC  
13 USB_VDD USB voltage detection
14 UDC+ USB data positive voltage
15 UDC- USB data ground/negative
16,17,18 GND  
19 CAR_ON#  
20,21,22 V_ADP +5 volts DC to charge/power the unit

Notes:
Some users report that serial interface is TTL logic which needs to be inverted (required) and voltages shifted ( not necessarily required) to be recognized by an RS232 interface.

CAR_ON# is connected to +6V/+5V on the car charger, its not connected in the cradle. +6V/+5V makes the phone go to speaker mode immediately when picked up or dialing. When this pin is connected to ground, the internal mike and speaker are turned off, and audio input is taken from the audio input pin on the connector, for use in real car kits.
Pin 2 GND / SENSE is not necessary. it seems that if its grounded, the phone hangs up when placed in a DIY Car-holder for example. - leave it unconnected.
Pin 5 ANALOG GND - connect this to your sound Input/output-GND (Speaker/Microphone) - do not connect this with the other GNDs - it makes a lot of noise on the analog input/outputs. Audio needs to be capacitively coupled in, any DC bias seems to inhibit audio.

If RS232_DCD is pulled to +6V/+5V, the device turns on and ActiveSync is started. The serial port powers down and needs to be reopened after the device goes in power-save mode.

USB power also wakes up the device and starts ActiveSync. UDC+ and UDC- are the USB data connections. One person reported measuring them the other way around.

Cable to plug into computer

This is the cable you need to talk to the Wallaby or Himalaya serially from a computer, such as is needed with our Manipulator program or for using ActiveSync through the serial port. Techies like us call it a null-modem cable, O2 describes it as a serial hotsync cable. Optionally, if you wish to be able to power/charge to XDA while using this cable, you could hook up a female connector that mates with the connector on your power adapter between Ground (pins 2,5,etc. on XDA) and pins 20,21 and 22 on the XDA. Make sure the center conductor on the power connector goes to pins 20,21 and 22.

Wallaby /
Himalaya
9-pin connector
(male)
2,5,16,17,18 5 (gnd)
6 (dcd) 4 (dtr)
7 (cts) 7 (rts)
8 (txd) 2 (rxd)
9 (rts) 8 (cts)
10 (rxd) 3 (txd)
11 (dtr) 6,1 (dsr, dcd)

Cable to plug into modem or GPS

This cable will connect to devices which come with a cable to plug into a PC serial port, such as a modem. If you are connecting to a device that only uses RX, TX and GND (such as many GPS receivers), you may only need the wires which connect to pins 2, 3 and 5 on the 9-pin serial connector. And you can, optionally, hook up a charging interface in the same way as described above.

Wallaby /
Himalaya
9-pin connector
(female)
2,5,16,17,18 5 (gnd)
6 (dcd) 1 (dcd)
7 (cts) 8 (cts)
8 (txd) 3 (txd)
9 (rts) 7 (rts)
10 (rxd) 2 (rxd)
11 (dtr) 4 (dtr)

Modifying iPaq accessories

Using the pinout of the XDA connector, you can now modify iPaq accessories to fit the Wallaby or Himalaya.

Wallaby /
Himalaya
iPaq
36xx or 37xx
iPaq
38xx or newer
2,5,16,17,18 (gnd) 4,10 10,15,22
6 (dcd) 9 6
(or 11, see below)
7 (cts) 5 13
8 (txd) 7 8
9 (rts) 6 12
10 (rxd) 8 7
11 (dtr) 3 9
14 (udc+) 11 19
15 (udc-) 12 21
20,21,22 (power) 1,2 1,2,3,4

 

22 pin male Himalaya proprietary of O2 Xda, Qtek 1010, 1020, Siemens SX56, T-Mobile MDA, Dopod 686 (all Wallaby); O2 Xda II, Qtek 2020, SPV M1000, Dopod 696 (all Himalaya); Audiovox PPC-6600, PPC-6601, VX6600; PDA cable connector connector layout
22 pin male Himalaya proprietary connector
at the PDA (keypad up)
According to 6 reports in our database (6 positive and 0 negative) this pinout should be correct.

Is this pinout
O2 Xda, Qtek 1010, 1020, Siemens SX56, T-Mobile MDA, Dopod 686 (all Wallaby); O2 Xda II, Qtek 2020, SPV M1000, Dopod 696 (all Himalaya); Audiovox PPC-6600, PPC-6601, VX6600; PDA cable connector visual pinout:
O2 Xda, Qtek 1010, 1020, Siemens SX56, T-Mobile MDA, Dopod 686 (all Wallaby); O2 Xda II, Qtek 2020, SPV M1000, Dopod 696 (all Himalaya); Audiovox PPC-6600, PPC-6601, VX6600; PDA cable connector diagram
click to enlarge
Source(s) of this and additional information: wiki.xda-developers.com
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