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Also the GPRS modem generally needs to be reset to maintain health, which why even if
the PwrOnTime, PwrOnInterval, and PwrOnDuration specify essentially a never-ending
By powering on the GPRS modem the user is given the ability to communicate with the
Xpert over a TELNET, TCP/IP, SSP/CL, and SMS session via the master station. As well
as send self-timed, and/ or alarm transmissions (this can be done without the power mode
settings enabled too)
The primary reason to turn off the modem is to reduce power consumption, or limit time
connected to the Cell network.
Please note that if the LAN is powered on at the same time that the GPRS is powered on,
that the LAN will be preferred and may cause a conflict. This is similar to how when you
enable WiFi on a cell phone, communications will whenever possible be routed using the
WiFi interface and not the 3G.
PwrOnAction
If set to “Connect” the modem will use the “PrimaryIP” address and connect to the
master station using the port set for “Command Port” and establish an SSP/CL session
according to the PwrOn schedule. This mode is meant as an option for one way systems.
For example, if the user was using Tempest and didn’t know the IP address of the GPRS
modem but wanted to connect to it, the GPRS modem’s PwrOnAction would need to be
set to “Connect” in order for the modem to connect to Tempest using a SSP/CL session.
If set to “Listen” (the default setting) the modem will connect to any master station that
initiates a connection. This is as long PwrOnInterval, PwrOnTime, and PwrOnDuration
are set to power the GPRS at the time of this operation.
For example, if the user was using Tempest and knew the IP address of the GPRS
modem and wanted to connect to it, the GPRS modem’s PwrOnAction would need to be
set to “Listen” in order for the modem to connect to Tempest using a Telnet, or TCP/IP
session.
Finally if a user connects to the unit remotely with one of the ways mentioned above, and
the self-timed and /or alarm transmission fails to reach the master station the user will get
logged out regardless of what the user timeout value is set to in the user settings.
GPRS Relay Settings
The Relay… button brings up a further dialog which allows power to the modem to be
controlled by a relay connected to a digital I/O point and to control the warm-up time.
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