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Producing a GPS output

Posted: Tue Oct 19, 2010 10:57 pm
by Chalkie5
I have set up the application and can get an output runnning through virtual COM Ports for installed applications ie input via usb GPS dongle output to Virtual COM10, memory map recieves input from COM10. However when I try to output COM to COM ie Serial port COM1 is set as the output with a Baud Rate of 9600, connect to another PC Serial Port COM1 with a 9 pin serial female to female and then look for an input, there is nothing coming through.

I'm using another PC to check to see if it is receiving GPS data from the computer as what I eventually want to do is feed the GPS info to a Nikon camera with a serial lead.

Any obvious I need to do?

RE: Producing a GPS output

Posted: Wed Oct 20, 2010 5:57 am
by richardhula
If you have a female to female dSub 9 pin cable to connect the two PC's, check the data in/out connections. It should be wired as null modem cable.

Pin 2 is data in, Pin 3 data out, so the connector at source PC running GpsGate, should have its pin 3 connected to pin 2 at the receiving end & vice versa for return if needed. pin 5 is common ground BTW.

Not sure what application you are using to monitor the NMEA at second, receiving PC but suggest HyperTerminal set to connected COM port @ 9600 baud.

Richard

There no place like 127.0.0.1

RE: Producing a GPS output

Posted: Sun Oct 24, 2010 4:46 pm
by Chalkie5
Hi Richard,

It's a sealed cable the pins on both ends are numbered:
5 4 3 2 1
9 8 7 6

So what you are saying is it needs to be rewired so the cable is normal on the output, but pin two and three needs to be swapped over on the input?

I am using hyper terminal at 9600.

Neil

RE: Producing a GPS output

Posted: Sun Oct 24, 2010 8:11 pm
by richardhula
Yes you need to wire cable with connections to pins 2 & 3 reversed between ends, so 2->3 & 3->2.

If you check with a meter/continuity tester you will probably find pin 2->2 & pin 3->3 at present which is why it won't work for your purpose.

You can either find a way (chop off one end & connect to another female connector) or buy a "null modem" dSub9 female to female cable which will be wired as suggested in first paragraph.

If you decide to make the connection up yourself make sure pin 5->5 is also connected as this is the common signal ground.

Richard

There no place like 127.0.0.1

RE: Producing a GPS output

Posted: Mon Oct 25, 2010 2:42 am
by Chalkie5
Richard,

Thanks for the information - very useful. Would never have twigged that myself. I'll get a "null modem" dSub9 female to female cable and give it a go.

Neil