Frequently Asked
Questions
GPS Receiver:
What brand
is this receiver module?
Can you tell
me the model of this receiver?
What chip
set does this receiver use?
What
NMEA sentences does this unit output in the default mode?
Can you tell
me if the GPS receiver will output the 1 PPS without connection to RS-232?
Is there a
way to disable or remove the RS232 driver?
Is it ok to
connect VCC_5v and antenna power to the same 5V supply (assuming a 5v antenna
is used)?
What brand is this receiver module?
Axiom
Can you tell me the model of this receiver?
Sandpiper II
What chip set does this receiver use?
This receiver contains a SiRF chip set. It is programmed to operate in NMEA-0183 upon power up. It can be set to output data in SiRF format. See the documentation on the CD-ROM that is shipped with the receiver.
What NMEA sentences does this unit output in the default mode?
$GPGGA, $GPGLL, $GPGSA, $GPRMC, $GPVTG, $GPGSV
Can you tell me if the GPS receiver will output
the 1 PPS without connection to RS-232?
Yes, 1 PPS is available on Pin 19, Normally low with 100ms TTL
high pulse once every second.
The description states that this unit has an RS-232 level shifter installed. Does this mean that the unit can be connected directly to a PC without the need for a level conversion and inversion circuit?
Correct, please refer to the above table "Minimum
connections to make receiver work:"
Is there a way to disable or remove the RS232
driver?
One buyer has reported that you can remove the RS-232 driver chip and there are pads that can be shorted to bring out the TTL serial to connector J1. I would suspect that this is true because these receivers could be ordered with or with out the driver chip, however I have not verified this information.
Is it ok to connect VCC_5v and antenna power to
the same 5V supply (assuming a 5v antenna is used)?
Yes
Last revised: Thursday September 13, 2007