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User Manual LineTroll R400D
The Indicator will only respond to a message which starts with a correct password or an
appropriate binary protocol heading. Faulty SMS messages i.e. faulty command or message
format will be acknowledged with an error message. The implemented codes are as follows:
99 1 1
Unknown command
99 2 1
Command not implemented
99 3 1
Corrupted command
99 4 1
Unable to execute command
99 5 1
Command rejected
Message filtering
It is not possible to set a message filter on the GPRS connection. All messages will always be
sent through GPRS.
It is possible to set a “message Filter” on the three SMS recipients. In cases where e.g. the
primary recipient should only receive transient and permanent faults and a secondary number
receive the other messages, it is possible to filter messages to each of the three recipients.
As an example for usage of the
message filter, the secondary number can be “maintenance
central” and should keep track on heartbeat messages, low battery, boot messages
etc.,
whereas the primary (e.g. the main SCADA) should receive the real fault messages from the
network only.
LineTroll R400D
Secondary NetTroll
microSCADA
System
ComTroll 120
GLR
Permanent and
Transient alarms
Main NetTroll
microSCADA
System
ComTroll 120
GLR
Heartbeat
messages, Low
Battery etc
Figure 10, message filter
It is advisable to send alarm messages to one recipient (e.g. NetTroll micro SCADA system)
and use a separate application to forward alarms to other recipients. NetAlert 3.5 is a program
that runs together with NetTroll and will forward alarms to unlimited number of recipients.
Polling interval
Because the GSM modem is normally switched off, it has a feature providing automatic
wakeup in certain intervals called the polling interval.
When the LineTroll R400D is due for polling, the GSM modem is powered up and connected to
the GSM network to check if a new message is sent to the unit.
This can be
