Sutron Corporation 8310 & 7310 Users Manual 8800-1125Rev. 2.7 (BETA) 4/16/2014 pg. 110
powered PwrOnInterval specifies how often to power on, PwrOnTime specifies an offset to the
interval, and PwrOnDuration specifies how long to stay powered.
For example, with PwrOnInterval = “01:00:00”, PwrOnTime = “00:30:00”, and PwrOnDuration =
“00:15:00”, the modem will be powered on every hour at half-past the hour, and will stay
powered for 15 minutes.
Also the GPRS modem generally needs to be reset to maintain health (re-establish
communications with the cell towers), which is why even if the PwrOnTime, PwrOnInterval, and
PwrOnDuration specify essentially a never-ending power on time, the modem will still be reset
periodically.
By powering on the GPRS modem the user is given the ability to communicate with the 8310
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 reason we give the user the ability to choose these settings is because by leaving it to be
powered all the time, for instance, would not be a cost efficient way of handling the modem.
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” as long as 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 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 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.
PrimaryIP and SecondaryIP
When the GPRS modem initiates a connection to the master station, the 8310 shall try using
“PrimaryIP” up to a certain number of times, and then try “SecondaryIP” up to a certain number
of times, with a few seconds pause between each attempt. The 8310 shall repeat this cycle until
a connection succeeds.
MessagePort, CommandPort, and RedirectorPort
Since the master station can't know the 8310’s IP without the 8310 first making contact in the
case of having PwrOnAction set to “Connect” for example. The Alpha must initiate all socket
connections to the master station using the “PrimaryIP” in such cases. Hence, the master station
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