9. RECEIVING OF SMS MESSAGE
GPRS module receives specially prepared SMS. If received SMS is not correct it will
be automatically cancelled and device will not operate any action.
As mentioned above the device may operate in two modes:
o with a new encoded protocol
o with PX protocol
Depending on operation mode there are varied commands available to control the
device.
9.1. NEW PROTOCOL
The following format of message is acceptable allowing to send some commends
with one SMS (every command shall be separated with SPACE ):
SERVICE CODE
█
COMMAND
█
COMMAND
█
..........
Where:
SERVICE CODE - device service code
█
- SPACE
COMMAND - order (see the table below)
List of commands
DISC Disconnects active TCP connection.
KILL Reset modem; after execution of command a confirmation is
sent.
RESET Reset device. Note: all unsent events will be lost.
OUT=outNr, state Turn on or turn off outputs. outNr specifies output number (0
for OUT1, 1 for relay output), state specifies requested output
state (0 – switched off, 1 – switched on).
Examples:
OUT=1,0 – switches off relay output
OUT=1,1 – switches on relay output
CMD= [timeout],
command
Issues AT command to GSM modem and sends response back.
Optional timeout parameter defines time for modem response.
Time determined in seconds and ranges from 1-30 seconds. If
timeout isn’t specified, 3 seconds is assumed.
DESC Returns device description, serial number (hexadecimal
number) and firmware version.
GETSTATUS Download device status. Command sends text back according
to definition from chapter 7.6.3 Status
GETPARAM=
parameter_name
Gets inquired parameter :SERVER, PORT, APN, UN, PW, DNS1,
DNS2, SMS, SMSPERIOD
GETCFG Gets primary communication parameters of device in form:
SERVER:PORT,APN UN PW,DNS1
APN=apn Access point to GPRS network. Parameter should be obtained
from mobile network operator. If APN address contain space
sign put it with “” e.g. “my apn”.
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