PBP and Lassen SQ GPS

[claxon]

HI Ron,

used to have same problem, but after connecting the 3.6V battery backup (not compulsory) and using "tsip chat" (DOS proggy u can get from trimble site) all went fine.

Beware that the "SQ Monitor" win-proggy does not always save registers.

regards

[rwilson]

Hi,

I am starting in GPS, but I have some dudes. I have a circuit that work with 5V and it has a PIC16 and a program to decode NMEA but I want to buy a Started Kit but I don`t know if I use a SmartAtenna F02 or Lassen SQ. The problem is that SmartAntenna works with 5V but is very expesive. Trimble es cheaper but works with 3.3V. My question is, Do I need a special interface to connect the Lassen SQ to PIC16 even it´s working to 5V?

Finally, Do I need a backup power to conserv NMEA protocol as default?

Thanks.

[claxon1]

Hi rwilson,

Do I need a special interface to connect the Lassen SQ to PIC16 even it´s working to 5V?.

Yeap, you do need a MAX232 like, level shifter. BTW , the IQ version is better.

Do I need a backup power to conserv NMEA protocol as default?

That is an Yes too if you want to keep the module settings, including NMEA sentences, NMEA protocol, and Serial comm port settings.

Good Luck

[rwilson]

Hello Claxon,

I saw the manual of Lassen iQ and says "User settings such as port parameters, NMEA, and TAIP configurations can be stored in the receiver`s non-volatile (Flash) memory. Theses settings are retained without application of main power or battery back-up power." The same manual say "Port 2 default output languaje: NMEA"

Then I think Lassen iQ doesn`t require batery back-up to conservs NMEA output languaje, Is it right?

Roger

[claxon1]

Roger,

You are right.

And if u are using the IQ and :

If you don't need RTC(keeping) info in your application , neither quick position fixes on start-up then just forget about battery. Leave some place though on your pcb to accomodate it if you'll need it later. I will set NMEA out (needed sentences if other than default) at first time prog then it will stay in flash mem. Use the second com port. See also my message dated 18th february in this thread.

Good Luck

[Angelica]

Hello. I´m working with a GPS lassen sq, and i conect the gps to max 232 and connect this to the serial port, but i run the SQ Monitor and don't have results. You can tell me how is the correct connection of the GPS and de serial port.

Thank you very much

[rwilson]

Hello. I´m working with a GPS lassen sq, and i conect the gps to max 232 and connect this to the serial port, but i run the SQ Monitor and don't have results. You can tell me how is the correct connection of the GPS and de serial port.

Thank you very much

Hello Angelica,

I really haven´t worked in a similar proyect. But in the next internet address you can get the next documents:
- Lassen iQ Pin connections.PDF, this document describes how connect the Lassen iQ/SQ when the RX´s pins aren´t used to communications. You need to know that there are a difference between the connections when you programm the Lassen iQ/SQ and when you use it to report GPS messages.
- Lassen-IQ GPS EVK Schematic.PDF, this document describes how connect the Max232 to Lassen iQ/SQ and Max232 to PC.
There are other documents that can help you in the same address.


http://www.sparkfun.com/shop/index.p...385401&cat=63&

in other case you can access with "www.sparkfun.com" and go to "GPS" and next to "Modules".

[Angelica]

Hi, i want change NMEA for TSIP output of my GPS lassen SQ

I go to the tsip104 in DOS and set te configuration but ehn i press enter show me
....waiting for reply(0x7B)
and never change

Please Help me

Thank you very much

[Ron Marcus]

Hi, i want change NMEA for TSIP output of my GPS lassen SQ

I go to the tsip104 in DOS and set te configuration but ehn i press enter show me
....waiting for reply(0x7B)
and never change

Please Help me

Thank you very much

What this means, is that the unit is at a different baud rate than the terminal program. Are you getting any legible data on the screen? If so, what speed id TSIPchat running at? If you don't know, or are gettong garbage, you can change the TSIP comms speed until you get data. Next, do a software reset, and that should bring you back to factory default. Next, try again. When you change from TSIP protocol to Ascii, you will not get a legible ack from the module. See if the change worked, and don't worry about a reply...

Ron