Communication
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
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
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
Example: “069, 1 sec. pause, 654321“: 0 6 9 P 6 5 4 3 2 1 – (= 10 characters)
Common modem settings are:
EO | - Echo off |
QO | - Enable result codes |
X3 | - Dial without checking for dial tone |
% CO | - Data compression off |
\ N1 | - Buffer off, fault correction off |
V1 | - Result codes in text format |
% B 9600 | - Baud rate 9600 |
\ 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) | |
80EB 5179 EN
