Using the A73x RTU
2.3 Special notes for the A733GSM/GPRS RTU
The A733GSM/GPRS RTU is based on a GSM module which employs a GSM
cellular network to transmit the telemetry data. Before you install such a device,
you must make sure a sufficient signal for proper operation of the RTU on the site
where you plan to use it exists; you can do this by using a standard cellular phone
operated by the same cellular provider. You can also verify that you can
communicate with the RTU simply by calling it as you would a normal cellular
phone.
The two ways to operate your A733GSM/GPRS RTU are as follows:
GSM mode: In this case please ask whether your provider offers CSD
connections.
Most cellular/GSM providers use a different telephone number for data
communication than for voice communication. Don’t forget to ask for this data
number when you order your SIM card, if you do not use the RTU in GPRS
mode!
When your modem calls the RTU from a land line, use the data number: else
the RTU will answer, but immediately send a busy tone, as the voice call
cannot connect to a data terminal. Voice calls cannot connect to a data
terminal, so you need to set up your modem to use the data number when
calling the RTU from a land line.
1.
2.
GPRS mode: Please make sure your SIM card is well suited for GPRS
operation.
You also need to insert your SIM card into the SIM holder inside your
A733GSM/GPRS RTU by following these steps:
1.
Open the lid of the A733GSM/GPRS RTU by unscrewing the four bolts in the
corners of the RTU and then remove the lid as shown in Figure 3 .
Fig. 3:
Removing the A73x Lid
Note:
You don’t have to remove the battery plug from the base board during this
operation, but make sure nothing is attached to the POWER connector.
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