VEGA Phoenix PSI Data Fax Modem - Manual (Page 68)

PSI-DATA/FAX-MODEM/RS232
4-22 692302
Caller ID Mode Caller ID or CLIP (Calling Line Identification Presentation) is the transmission of the
caller’s telephone number. If this function is enabled at your analog connection, the
PSI-DATA/FAX-MODEM/RS232 can detect, output, and evaluate the caller ID.
When the caller ID output function is activated in the PSI-DATA/FAX-MODEM/
RS232, the caller ID, e.g., for Deutsche Telekom is transmitted after the first ring,
i.e., the modem does not accept the call until after the second ring. The caller ID is
then detected by the PSI-DATA/FAX-MODEM/RS232 and output to the RS-232
interface as follows:
<CRLF>RING<CRLF>
CLIP:0401234…<CRLF>
<CRLF>RING<CRLF>
A telephone number is only then output if a valid caller ID has been detected. It is
only output once for each call.
Selective Call Acceptance
If "Selective Answer" is selected, the PSI-DATA/FAX-MODEM/RS232
automatically checks whether, e.g., the service PC is calling the modem and
establishes a connection. Up to two telephone numbers can be stored in the device,
which the modem compares and automatically establishes a connection if they
match. The fields Caller ID 1 and Caller ID 2 are reserved for this function.
If these numbers are stored in these fields and "Selective Answer" is enabled, the
PSI-DATA/FAX-MODEM/RS232 checks each call to see whether one of the saved
numbers has been called. If so, the modem accepts the call and establishes a
connection, regardless of the settings for automatic call acceptance. Your control
system therefore does not have to evaluate the caller ID and the modem makes
sure that the service numbers (Caller ID 1 and Caller ID 2) reach your system, even
without a call back function.
The telephone number evaluation function has a filter function, which also enables
partial evaluation of the telephone number. The evaluation starts with the last digit
and is carried out for each stored digit. If, for example, from the telephone number
0123456789 only the digits 56789 have been stored, all telephone numbers that
end with these digits are classed as valid. The number of preceding digits is of no
importance. The advantage of this is that various formats (e.g., +49 40 xxxxx and
040 xxxxx) can be evaluated.
The "AA" LED flashes to indicate that this mode is active. The call is only accepted
if the stored numbers match. The caller ID is also output.
Password Enter your password here.