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Configuring the RTU GPRS Connection settings
Use the following commands to define the intervals the RTU will wake up and
connect to the A840 Telemetry Gateway:
GPRSCONNALIGN [align]
GPRSCONNINT [interval]
GPRSSECRET <secret>
GPRSTMOUT [interval]
Set these parameters according to the needs of your application. Make sure you
choose the proper parameters for GPRSTMOUT (to allow for appropriate idle
times, but not ones that are too long), GPRSCONNALIGN and GPRSCONNINT
(for specifying the proper connect times of the RTU). Also take into account, that
the RTU will be polled for data by the Adcon Telemetry Gateway within the
GPRSTMOUT time.
If you need your RTU to detect within an hour that the connection to the Adcon
Telemetry Gateway is broken, set the GPRSTMOUT to 3600 seconds. But make
sure, that the RTU is polled for data at least once within that time span.
Note:
Keep in mind that "calling" the A840 Telemetry Gateway costs battery power.
Recommended Settings for A733 GSM/GPRS with WaveCOM Module:
On the RTU:
On the gateway:
2.4 Field Installation
Installing A73x RTUs in the field is a fairly simple process. You'll perform a
connectivity check with an LED tool (does not apply to A733GSM/GPRS RTUs).
The LED tool is shown in Fig. 5.
•
GPRSCONNINT 3600 or 7200 or 10800 (1, 2, 3 hours connection interval)
•
GPRSCONNALIGN is per default set to align the connection to 8:00 (UTC)
•
Check the "Close connection after poll" checkbox for the RTU
alignment of calls in seconds (default 28800,
i.e. 8:00). NOTE: These wall clock times are
either UTC or local time of your A840
Telemetry Gateway, depending on the setting
of the "Wireless Network uses:" switch on
your A840 Telemetry Gateway.
interval between two connection attempts in
seconds (default 43200, i.e. 12 hours).
this 32-bit integer (0 to 4294967295) has to
be set for the RTU and the gateway. This is a
shared "secret" or password.
idle time out in seconds (default 3600, i.e. 1
hour). Connections that are idle this long will
be terminated by the RTU.
Using the A73x RTU
17
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