Readme for Passthru.exe

This program is used to send the GPS Pass Through command to the Serial Output
A/D board. After receiving this command, the A/D board will send all serial 
data from the GPS port to the Comm port and all data from the Comm port to the 
GPS port. In this mode, programs like WinPlotGPS can send and receive data to 
and from the GPS receiver.

Passthur.exe is a 32-Bit Command line program. To run the program open a DOS 
box, locate the program, and then type the program name. You will be asked for 
the computer Comm port, BAUD rate and receiver type. The BAUD rate is usually 
set to 38400. If you have changed the A/D board BAUD rate in WinSDR, you will 
need to use that BAUD rate setting. The A/D board supports two GPS receivers. 
You can specify either the Motorola ONCORE or Garmin GPS 16 receiver.

After entering the information, the program will initialize the A/D board and 
GPS receiver so that it can be placed in the pass through mode. Below is what 
you should see after starting the program:

C>passthru.exe
Comm port [1]:
Comm Port = 1
Port BAUD Rate: 1 = 38.4K, 2 = 19.2K, 3 = 9600, 4 = 4800 [1]:
Port BAUD Rate = 38400
GPS Receiver Type 1= ONCORE, 2 = Garmin GPS 16 [1]:
GPS Receiver Type: ONCORE
Press ESC key to quit or the P key to enter the GPS pass through mode....
Sending Configuration Information
A/D Board Message: GPS - Time: Diff:-854 VSat:10 TSat:4
Sending Status Request Packet
New Data ID: 12912630 UTC Time: 02:10:2003 04:58:39.998
Status Packet - A/D Board Firmware: 2.4

To enter the pass through mode press the P key. You should then see the raw data 
from the receiver. Now press any key to exit the program.

The A/D board should now be in the pass through mode.

-Larry Cochrane
Redwood City, PSN