6 Using the optional GSM MODEM
The optional GSM & WCDMA cellular MODEM (Sierra Wireless AirLink GL8200) enables a
remote over-the-air cellular wireless connectivity of the SLC-220 to cell phones or other cellular
modems. A cellular modem communicating with the SLC-220 can be a part of SLR-220 receiver
or a part of any end-user computerized system.
The SLC-220 will send reports only to pre-defined users. The reports are text (SMS) messages
generated according to the status of the sensors and according to the messaging setup.
The format of status messages is:
nn,sensor name,Status,Signal
nn - Serial number of the message. The number rolls to 01 after reaching 99. Message
numbers help to identify the order of sent messages in cases of multiple messages during
a short period of time, or in case that the cellular infra-structure is heavily loaded.
sensor name - Sensor name (up to 13 characters), as programmed previously by the user.
The name appears in the messages inside double quote characters, for example
“Tank 15”.
Status – Can be either Air or Water or Oil or HiOil or Fail.
Signal - a 4 digit value with the uA units (micro Amperes) at the end. This is the last known
reading of the sensor before the message was sent.
Example:
24,”TANK 7 DRAIN”,Water,1563uA
Repeated messages of the current status will be sent as often as required and set, and this
serves as an indication that the system is alive.
The user can set many operational parameters by sending text messages in one of the formats
listed in paragraphs 6.1, 6.2 and 6.3 below. Each message is responded by the SLC-220 in a
similar format as an acknowledge. The user should wait for this acknowledge before sending the
next message to the SLC-220.
There are three main types of text messages to the SLC-220:
• Configuration - set & get an acknowledge.
• Calibration - set & get an acknowledge.
• Inquiry - inquire & get a reply containing the requested data / parameters.
Currently the SLC-Manager PC program is sufficient to set and review all parameters of SLC-220,
except the specific parameters related to the GSM option.
The LCD on the front panel of the SLC-220 (if installed), is another way for setting and review all
parameters of SLC-220, and in addition can be used to set GSM users.
Configuration setup can be done through the LCD and through SMS messaging to / from the
SLC-220.
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