GPS-721 User Manual
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GPS-721 User Manual V2.0, Oct. 2010
1.3.3 Pin assignments and LED indicators
Pin assignments
LED indicators
LED
Status
Description
ON
The module is operating / functioning correctly.
Sys.
OFF
There is an error with the module.
The module has encountered an error.
ON
Digital Output is active.
DO1
OFF
Digital Output is off.
ON
The number of signals received from GPS
satellites is less than 5.
S1
OFF
Module can’t receive any GPS signals.
ON
The number of signals received from GPS
satellites is 5 ~ 8 or above.
S2
OFF
The number of signals received from GPS
satellites is less than 5.
ON
The number of signals received from GPS
satellites is more than 8.
S3
OFF
The number of signals received from GPS
satellites is less than 8.
ON
The PPS is on.
1 PPS
OFF
The PPS is off.
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