Page
132
of
248
When the front panel button is pressed, and when the station goes into alarms, listening is automatically
turned on for one hour.
When the cell modem is powered on, the station will act as a TCP/IP server, ready to accept incoming
connections from LinkComm if
Accept TCPIP Connects
is enabled. Additionally, the station will be ready to
accept incoming SMS if the
Accept SMS
setting is enabled.
If
Accept TCPIP Connects
is enabled, the station will listen on port 3001. Only one connection may be
established at a time.
If power consumption is of concern, setup the station to periodically check for SMS messages (see
Msg
Interval
below). Shorter intervals result in higher power consumption. Longer intervals mean a longer
response time. For example, if
Msg Interval
is one hour, it may take up to one hour for the station to
receive a message.
Once there is a need to connect to the station, send a message to the station asking it to start listening
and to accept TCP/IP connections. That message should say
!ACCEPT TCPIP CONNECTS = ON
!CELL LISTENING=ON
Once the station receives the message, it will send a reply. From that point on, the station is online and
available to connect. It will stay online until listening is turned off. Use LinkComm to connect to the
station and perform the appropriate operations.
Do not forget to turn off listening and TCP/IP connects before disconnecting.
To have the station only turn on listening for a limited time period, use the LISTEN command. For
example, to have the station go online for two hours send an SMS saying
!ACCEPT TCPIP CONNECTS = ON
!LISTEN 7200
Two hours is 7200 seconds.
Please note that the
Msg Interval
setting (described below) determines how often the station checks for
incoming messages. If that is set to six hours, it means that it may take up to six hours before the station
receives incoming messages.
Accept TCPIP Connects
This setting controls whether the system will
ever
open a listening socket in order to accept incoming
TCP/IP connections on port 3001. Normally, that port is used to allow LinkComm to connect to the station
remotely.
Accept TCPIP Connects
is enabled by default.
Disabling incoming TCP/IP connections increases the security of the station. This setting is new with
version 8.21.
Summary of Contents for SUTRON XLINK 100
Page 230: ...Page 230 of 248...
Page 247: ...Page 247 of 248...
