UniMod GSM-4
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To trigger the automatic baud rate detection the control input UE (terminals
8/GND and 9/UE) must be short-cut for at least 5 seconds. After that the
leftmost INF-LED flashes three times and the detection is started.
The UniMod GSM-4 checks these baud rates in order: 19200, 9600, 4800,
2400, 1200, 600 und 300 Bd. Before the baud rate is switched the left INF-
LED flashes three times. At every try the modem sends the string
„/?!<CR><LF>“ to meter and waits two seconds for the answer. If it gets a
valid answer, this baud rate is chosen for further communication and saved.
All three INF-LEDs blink in this case like this:
INF-LED Function
Baud rate
Flashing
1 time: 300 Baud
2 times: 600 Baud
3 times: 1200 Baud
4 times: 2400 Baud
5 times: 4800 Baud
6 times: 9600 Baud
7 times: 19200 Baud
Operating status after baud rate detection:
In GPRS mode a „warm restart“ is done. Meter can be read after 60 sec-
onds.
In CSD mode (dial-up connection) the modem pauses for 10 seconds. After
that the meter can be read.
If no matching baud rate is found the originally programmed baud rate re-
mains active.
After completion of baud rate detection the jumper at terminals 8/GND and
9/UE should be removed, else it will be performed after every power out-
age. To start the detection process immediately after another one has been
performed then the jumper must be removed for at least 5 seconds and af-
ter that closed for 5 seconds again.
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Important: Only one VDEW2 (IEC1107) meter must be connected to
UniMod GSM-4 while the detection process is running ! Disconnect all
meters except one before you start the baud rate detection. Before re-
connecting the other meters all must be set to the same baud rate as
the first one uses. At all meters disable baud rate switching as defined
in IEC1107 Mode A !
Summary of Contents for UniMod GSM-4
Page 4: ...UniMod GSM 4 4 ...
