Modem timeout (t)
When the controller connects to the GLT but without addressing a Modbus data point, the con-
nection is closed after the time specified for
Modem time-out has elapsed. If the error status reg-
ister has not been read during the GLT connection, the controller dials up to the GLT again after
the
Modem dialing pause (P) has elapsed.
Number of redialing attempts (C)
The controller tries to dial up to the control system again, observing the
Modem dialing pause,
in case the control station/text messaging center/fax is busy or the function that triggered the
call has not been reset by the controller. After the specified number of redialing attempts have
failed, the district heating controller dials up the alternative recipient.
Resetting of triggered call = Reading the error status register (HR 40060)
Phone number of control station (tELno)
Enter the phone number of the control system modem including the dialing code, if necessary.
Short pauses between the numbers can be entered using P (= 1 second); the end of the string is
to be marked by “–“. The phone number may include a maximum of 22 characters.
Example: “069, 2 sec. pause, 4009, 1 sec. pause, 0“:
0 6 9 P P 4 0 0 9 P 0 – (= 11 characters)
Phone number of the alternative recipient (rESno)
Enter the phone number of the alternative recipient including the dialing code, if necessary.
Short pauses between the numbers can be entered using P (= 1 second); the end of the string is
to be marked by “–“. The phone number may include a maximum of 22 characters.
Example: “069, 1 sec. pause, 654321“: 0 6 9 P 6 5 4 3 2 1 – (= 10 characters)
Common modem settings are:
4
EO
- Echo off
4
QO
- Enable result codes
4
X3
- Dial without checking for dial tone
4
% CO
- Data compression off
4
\ N1
- Buffer off, fault correction off
4
V1
- Result codes in text format
4
% B 9600
- Baud rate 9600
4
\ VO
- Standard connect result codes
Resetting to default settings
A modem can be reset to its default settings directly at the controller using the key number.
Key number
Command
44
AT&F&W <CR> <LF>
45
AT&F&W ATX3 <CR> <LF> (for branch exchange systems)
80
EB 5179 EN
Communication
