Volkslogger to HP IPAQ hx4700 Connection

I am trying to make a cable to hook a Volkslogger to an HP IPAQ hx4700
to download flight logs. Can anyone provide some advice on which wires
to hook together for the data transfer. I have the power connections
under control.
Pin out for the devices is below.
Thanks
John

HP Volkslogger
1 +5v 1 gnd
2 +5v 2 gnd
3 +5v 3 serial input
4 +5v 4 NEMA output
5 gnd 5
6 RS-232 Data Carry Detect 6
7 RS-232 Receive data 7 +12v
8 RS-232 Transmit Data 8 +12v
9 RS-232 Data Terminal Ready
10 gnd
11 RS-232 Data Set Ready
12 RS-232 Request to Send
13 RS-232 Clear to Send
14 RS-232 Ring
15 gnd
16 no connect
17 USB Detect
18 no connect
19 USB Data+
20 gnd
21 USB Data-
22 gnd