non-standard data from EM-406 - SparkFun Electronics Forum

non-standard data from EM-406#123815

By rohindeep - Sat Mar 26, 2011 12:36 pm

- Sat Mar 26, 2011 12:36 pm #123815

hey
i'm using EM406 for my engineering project. i connected it to my laptop using a serial-usb converter. The data received in the hyper terminal is not in NMEA format, rather something absurd i guess.... checkout the screenshot. please help me out with this asap.
rohin

Re: non-standard data from EM-406#123930

By ekoy - Mon Mar 28, 2011 3:55 am

- Mon Mar 28, 2011 3:55 am #123930

gps data from an EM-406 is a ttl data which is 0V and 5V (binary 0 and 1). but rs232 data is -13V to +13V for binary data 0 and 1. you need to use an inverter before you connect the gps tx pin to the rs232 rx pin...

Re: non-standard data from EM-406#123950

By rohindeep - Mon Mar 28, 2011 7:06 am

- Mon Mar 28, 2011 7:06 am #123950

yes.. i'm aware of it and for that i'm using a serial-usb converter. But still i'm getting the same data(screenshot).

Re: non-standard data from EM-406#123952

By fll-freak - Mon Mar 28, 2011 7:29 am

- Mon Mar 28, 2011 7:29 am #123952

Two guesses.
1) Baud rate set wrong. GPS is not sending at 4800 like you set up Hypertem for.
2) GPS is not sending NMEA but rather the binary SIRF format.

-Skye Sweeney

http://www.fll-freak.com/blog

Re: non-standard data from EM-406#123953

By ekoy - Mon Mar 28, 2011 7:29 am

- Mon Mar 28, 2011 7:29 am #123953

check ur usb- serial cable ( i assume if its CDR king brand check the product for durability and effectiveness) and also install the required software for it.

we have the same GPS module and its working fine with me

Last edited by ekoy on Mon Mar 28, 2011 10:51 am, edited 1 time in total.

Re: non-standard data from EM-406#123969

By rohindeep - Mon Mar 28, 2011 10:46 am

- Mon Mar 28, 2011 10:46 am #123969

@fll-freak:- It could be the baud rate because when i used the 'Synchronize Protocol & Baud Rate' option in SiRF Demo 3.87, it synchronized itself to 57600. But even after changing the settings of COM port to 57600 baud rate, the result's still the same. As far data format is concerned, it's definitely not NMEA and i'm not sure about the SiRF format. Do you know any software, except SiRF demo, which can read SiRF data?

Anyways i'm posting some more screenshots of some different programs i tries out... check them out.. especially the SiRf demo, because i'm getting some errors in it.

@ekoy:- i'm pretty sure that my serial-usb cable is working fine as i checked it with some of my other stuff.

Re: non-standard data from EM-406#123973

By ekoy - Mon Mar 28, 2011 10:50 am

- Mon Mar 28, 2011 10:50 am #123973

ahh isee so you need a SiRf Data but its better with NMEA

Re: non-standard data from EM-406#123975

By rohindeep - Mon Mar 28, 2011 10:58 am

- Mon Mar 28, 2011 10:58 am #123975

SiRF Demo:
I'm getting some frame errors in SiRF..

RealTerm:
This software is showing some errors as well.. check out the status pins in the screenshot and at the bottom it says 'UART receiver framing error'

GPSInfo:
This software comes with the module. It's made by the Globalsat people.. and i'm not even getting any response in it.

GPS Utility:
This software is showing an error regarding buffer overflow and baud rate.

Re: non-standard data from EM-406#123976

By rohindeep - Mon Mar 28, 2011 11:00 am

- Mon Mar 28, 2011 11:00 am #123976

I need the NMEA data only...
i was just wondering if there is any software which can read SiRF data, so that i can check my module..

Re: non-standard data from EM-406#123979

By ekoy - Mon Mar 28, 2011 11:56 am

- Mon Mar 28, 2011 11:56 am #123979

SirF demo 3.87 is quite good software.. If you need NMEA data better use NMEA than Sirf

Re: non-standard data from EM-406#123980

By ekoy - Mon Mar 28, 2011 11:58 am

- Mon Mar 28, 2011 11:58 am #123980

MY SAMPLE

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