EG_GenLoc41e_1055_UG_003_UK
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Descriptions and non-contractual illustrations in this document are given as an indication only.
ERCOGENER reserves the right to make any modifications.
Dct_427_02
7.9 GPS module
The GenLoc 41e was designed from a GSM/GPRS module with the GSM or GPRS communication functions
and a high-sensitivity 50-channel GPS module.
As a consequence, the GenLoc 41e is able to receive GPS
positions with different filtering criteria (see the document "EG_EGM_CL_xxx_yy" of ERCOGENER).
7.10 Direct GPS mode (Analog Switch)
The modem contains the EGM standard library (see the documents "EG_EGM_CL_xxx_yy" of
ERCOGENER); in this case, it is possible to use directly the GPS frames via the RS232 (V24). In this case,
the internal analog switch allows to transfer the transmission and reception signals of the GPS module
directly to the RS232 serial link.
The GSM_DSR signal becomes the GPS_TxD signal (transmission of the GPS NMEA frames) towards the
terminal.
The GSM_DTR signal becomes the GPS_RxD signal (reception of the UBX frames) coming from the
terminal.
The commands used to switch in direct GPS mode are:
For the DSR :
AT+GPIOSET=19,<x>
and for the DTR :
AT+GPIOSET=20,<x>
The transfer is made in the following form:
AT+GPIOSET=19,<x>
et
AT+GPIOSET=20,<x>
with:
<x>
= 0 : mode GSM_DSR and GSM_DTR
1 : mode GPS_TxD and GPS_RxD
Examples:
In direct GPS mode, the format of data coming from the GPS module is by default.
9600 bits/s
8 bits
No parity
1 stop
Command
Response
Interpretation
AT+GPIOSET=19
+GPIOSET: 19=0
OK
Mode GSM_DSR
AT+GPIOSET=19,1
AT+GPIOSET=19,1
OK
Mode GPS_TxD and GPS_RxD (direct GPS
mode)
AT+GPIOSET=20,1
AT+GPIOSET=20,1
OK
