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Controling a Holux GM-270 GPS device - power on

I have a PocketPC with a Holux GM-270 add on GPS device. I understand how to watch the serial port to get NMEA strings to parse. But how do I send commands to the device to turn it on and to set the rate at which positions are sent to the port? I want to simply query the current position without getting a continuous stream of positions from the device. I want it to wait until I request a position. Is this possible? Thanks.

Timothy Dean
MobileDataforce

ASKER CERTIFIED SOLUTION

Jaime Olivares

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imarshad

There is a utility called SirfDemo that will allow you to do what you require..... Here is the link.....

http://www.holux-uk.com/Products/gm-270/downloads.htm

I think you must have got it with your GPS.....

Imran

kevinbenedict

ASKER

Imran,

Yes, I have that demo. That is exactly what I want to be able to do, but I want to be able to add the code to my program to do it. In particular, the I want to be able to execute the "Open GPS" and "Close GPS". How would I do this? Is this a NMEA command? Thanks.

Timothy Dean
MobileDataforce

imarshad

from Jaime
>>
> I want it to wait until I request a position
I think there is not NMEA GPS that works this way.
>>

>> I want to be able to execute the "Open GPS" and "Close GPS". <<

Then why have you accepted the wrong answer from Jaime????? It is ***definately*** possible to program a GPS so that it will remain dead until you request a position.....

Imran

kevinbenedict

ASKER

That was only the first part of my question. I am new here and accepted his answer by mistake. The second part of my question is how to turn the GPS device on and off just like the "GPS viewer" program that comes with the device. I will post another question. I have the "GPS viewer" program but I have not looked at the SirfDemo. I will check that out as well.

Timothy Dean
MobileDataforce

imarshad

If you have read my comment on the other question then you must have realized that it is possible to control the data output from a GPS receiver......

Imran