PBP and Lassen SQ GPS

[Angelica]

Thank's RON, efectivelly the baud rete of my port was different that the baud rate of the aplication

Thank you for your help

[kohatya]

I have purchased one piece but no starter kit.
Need suggestions on how to get started.

Kohatya

[Ron Marcus]

I have purchased one piece but no starter kit.
Need suggestions on how to get started.

Kohatya

My first suggestion will not be helpful...Return it. Get the IQ instead. Here's why. The SQ speaks in a Lassen protocol called TSIP. It Tsucks! It is obscure at best, and difficult to work with. That being said, if you are going to stick with it, you will need a RS232 level converter to allow it to speak with your PC. Next download the Tsipchat utility from the website, and reprogram it for NMEA output at 4800 baud. You can burn it into the onboard eeprom and then you are ready to install it in your app, sans the level shifter. The IQ has a dedicated NMEA output, once per second, which eliminates this step. The connectors are another story, they are available from another vendor in sample quantities. The manual has the sources of parts.

(Gripe)
(One comment here, the price of the development kit is obscene, and unjustified. I had to buy one because this is what my customer wanted(and paid for). THe ZX modules by Wonde Proud, as sold by this site's sponsors is a much better value, and the development board is much less. If you buy one, I get my standard $0.- commision.)
(Gripe ends)

Next, do a search on interfacing the basic stamp to a gps engine, there is a great part of the code which looks for the GPGGA header then downloads the coordinates to RAM for your purposes. Ii's easy to adapt to PBP. Finally, go run around outside and see where you are!

Hope (most of) this helps,
Ron

[F1CHF]

hello
my objective is to get the 1PPS signal to synchronize a 10 Mhz VCXO
for the moment I spend hours to understand how to "speak" with this GPS Receiver
I got a lot of sotware .. TSIP104 seems the best one
for the moment the 1 PPS is a 0,5 PPS ! with a very short Positive pulse (0,2µS)
I have done a very big program to monitor it !

essai:
if PPS = 0 then goto essai
high ledrougeause 100: low ledrougeause 100
goto essai

I works ! but not very wonderfull, may be the 12F675 int clock has problem
to sample the 3,3 volts signal (1PPS from GPS) because the flashing is not OK all the time
I see in the GPS datasheet that PPS signal can be setted with many options
One could be good for me "option that say that PPS signal will be avalaible if the receiver
see at least 3 sats" I didn't find how to set up this condition
eitheir in NMEA or TSIP mode ..
If "somebody" has done with this PPS signal, any input will be appreciated
thanks
Francois