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How to change the rate of a GPS module

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ADGANL

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Hi everyone! This is a basic question about GPS modules. I'm using two GPS modules for testing, Tellit JF2 and Venus. I want to set the GPS send only RMC and GGA messages and send it every 30s. I know that I need to use NMEA 103 message to set this. But I was not successful.
 

Hi,

I'm not experienced in this..

But in another thread I read that it can be set to send position data "on request only".
So simply poll the position data every 30s.

Klaus
 

But I was not successful
Click to expand...

Instead of giving void information, why don't you show what exact command have you sent ?
 

Hi! Sorry for not giving specific information. This is the command I used.

$PSRF103,00,00,30,01*25
Click to expand...

I have set it to output only RMC messages but it outputs all default messages. i.e. RMC,GGA,GSA, VTG,etc
This is from the reference manual about query/control message.

Capture2.JPG
 

You did not recalculate the checksum, that's what you did:

Code: 
$PSRF103,00,00,30,01*25

That's what at datasheet:

Code: 
$PSRF103,00,01,00,01*25

According to this website, it should be:

Code: 
$PSRF103,00,00,30,01*27
 
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    ADGANL

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Thanks for that. But still I can't set it to only output RMC or GGA

Capture3.JPG
 

I did not read this dataasheet, except the snapshot you attached above, but I would expect a response from the GPS module in the case of the command being accepted or rejected ( eg: "OK", "-1", etc...). Take a look at the documentation of this module and check the error message from it, if sent, right after above command issued to it.
 

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