GPS module to Serial port - help

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dacflyer
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GPS module to Serial port - help

Post by dacflyer » Wed May 07, 2014 5:08 am

i got a GPS module that i want to see the raw data on my laptop.
the GPS has serial output of 9600 baud and has the common TX RX Gnd.
well i tried to connect to it via Hyper Terminal and it did not work, i also used a Program
that the GPS ( U-Center v.8.10 ) and i still cannot connect.
do i need something more between the GPS and my laptop ? a sort of converter ?

i have seen other uses of the GPS module connected to Arduinos etc.
but i read that the GPS has serial output. so i thought it could connect directly to the laptop.

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joepardue
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Re: GPS module to Serial port - help

Post by joepardue » Wed May 07, 2014 7:16 am

There could be any number of reasons for this problem and since I don't have experience with GPS modules I can't help with this other than to suggest Googling the brand name of the GPS unit along with the word 'Arduino'.

Joe

dobrien
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Re: GPS module to Serial port - help

Post by dobrien » Wed May 07, 2014 9:33 am

What kind of GPS module.
Make sure the GPS RS-232 output goes to the PC RS-232 input and the GPS RS-232 input connects to the PC RS-232 output.
Do you need the RS-232 Handshaking signals? Do you need you need to send a command to the GPS to initialize the unit
or to to get data ? Radio Shack used to carry an RS-232 device with LEDs to check the status of RS-232 communications.

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Re: GPS module to Serial port - help

Post by dacflyer » Wed May 07, 2014 10:31 am

the GPS is a Ublox NEO-6M GPS Module
only connections are 5V - Gnd - TX - RX

a question i forgot to ask is.. as far as TX and RX go,
does it connect as such...

GPS.................DB9
TX---------------RX
RX---------------TX
.........or is it..
TX---------------TX
RX---------------RX

we have camera equipment at work that uses the TX---RX and RX-----TX connections.

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Re: GPS module to Serial port - help

Post by dacflyer » Wed May 07, 2014 7:52 pm

ok, i did some more research and got my answer i think..
i finally found out the GPS TX RX are only 3V levels and i do need a 232 converter.
so thats the next item to find..
local electronics store does not have any such thing, neither does RS..
so online i go searching.
i still need to understand my question from above this one.

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Re: GPS module to Serial port - help

Post by dobrien » Thu May 08, 2014 6:13 am

Maxim makes a RS-232 transceiver the MAX3232.
You can also get two seperate chips a transmitter an a receiver.
I do not remenber the numbersmbut the require a +12v and a -12v supply.

The output of the GPS module TX should go to the RX of the computer and
the RX of the module go to TX of the computer.

GPS.................DB9
TX---------------RX
RX---------------TX

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Re: GPS module to Serial port - help

Post by dyarker » Thu May 08, 2014 7:50 am

I answered in General Section, but didn't address voltage. The maximum voltages to drive RS-232 lines are plus and minus 25V. The minimum voltages on a connected input are plus and minus 6V. +12 and -12 usually meets these specs. (where usual means reletively short (low resistance, low capacitance cable)) In fact, Maxim RS-232 interface chips use +10 and -10 to drive the lines.
Dale Y

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