Hi C-Man,C-Man said:Hi ericmar,
I worked with Garmin GPS25 and GPS35 a few years ago.
All you have to do is enable the required output messages (using GPRMO) and you will get a new message every second.
You can initialize the unit if it has never been at your current position but this is not necessary. It might take longer to get the first valid fix under this condition but thats all.
Should you need any more info do not hesitate to ask ...
best regards
ericmar said:Thanks everyone!
Wat if I want to trace something and keep moving the GPS receiver, will it still work?
So how far I hv to move to see the longitude and latitude change? Wat about the altitude? I cant find any message which provides the information about altitude but when I use the Garmin software application, it shows Altitude!?C-Man said:ericmar said:Thanks everyone!
Wat if I want to trace something and keep moving the GPS receiver, will it still work?
Sure that is what GPS is designed for Garmins are specified up to 999 Km/H
May application was a data logger for gliders (sailplains) which also go up to 300 Km/H ...
best regards
ericmar said:So how far I hv to move to see the longitude and latitude change? Wat about the altitude? I cant find any message which provides the information about altitude but when I use the Garmin software application, it shows Altitude!?C-Man said:ericmar said:Thanks everyone!
Wat if I want to trace something and keep moving the GPS receiver, will it still work?
Sure that is what GPS is designed for Garmins are specified up to 999 Km/H
May application was a data logger for gliders (sailplains) which also go up to 300 Km/H ...
best regards
Thanks a lot!
ericmar said:Hi,
Can anyone explains this to me? In PAge 8 of this GPS receiver's datasheet, it said :"The unit accepts TIA-232-F (RS-232) level inputs and transmit voltage levels from ground to the input voltage, TIA-232-F (RS-232_ polarity." So wat does it mean? Besides, how much voltage do I need to supply to it actually? I tried +5V and it works but it's not mentioned very clear in the datasheet!
Its datasheet: h**p://www.garmin.com/manuals/GPS18_TechnicalSpecification.pdf
I'm trying to get the data from this GPS receiver through using a MAX232 however, I'm getting junk message! I tried invert the DATA but it doesnt seem to be correct either.
Thanks.
Regards,
Eric
I tried connecting this unit directly to the PC via serial COM port without using MAX232 and it works. I only supply +5V to it and i didnt do any inversion. How come?C-Man said:ericmar said:Hi,
Can anyone explains this to me? In PAge 8 of this GPS receiver's datasheet, it said :"The unit accepts TIA-232-F (RS-232) level inputs and transmit voltage levels from ground to the input voltage, TIA-232-F (RS-232_ polarity." So wat does it mean? Besides, how much voltage do I need to supply to it actually? I tried +5V and it works but it's not mentioned very clear in the datasheet!
Its datasheet: h**p://www.garmin.com/manuals/GPS18_TechnicalSpecification.pdf
I'm trying to get the data from this GPS receiver through using a MAX232 however, I'm getting junk message! I tried invert the DATA but it doesnt seem to be correct either.
Thanks.
Regards,
Eric
When you are using the LVC part you must use TTL levels (but inverted) the LVS parts use RS232 levels for example through a MAX 232.
As the datasheet says the unit accetps RS232 levels but only up to the supply voltage.
When you are using the unit with a +5V powered microcontroller you do not need a max 232 but you must use inverters in the receive and transmit path.
If you want to use this unit with a PC you must use MAX232 but you must also use inverters at the TTL side because the unit operates with inverted levels ...
The unit needs to be powered by +5V.
1.6.2.1
GPS 18 LVC 4.0 - 5.5V
best regards
ericmar said:I tried connecting this unit directly to the PC via serial COM port without using MAX232 and it works. I only supply +5V to it and i didnt do any inversion. How come?
ericmar said:On the other hand, I tried passing the information to the PIC by connecting the TX line (from GPS receiver) to RX line (of PIC) and then echo back the data to the PC by connecting the TX line (of PIC) to the RX line (of PC serial COM Port ) through MAX232. It didnt work! I tried using a Hex inverter IC to invert the data in between of the PIC and MAX232, it still didnt work! I can get some junk messages and they appear to be repeating pattern which I suspect i could hv made a minor mistake!
Thanks for help anyway!
Regards,
Eric
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