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Special Functions

692302 5-9

5.4 Caller ID and Selective Call Acceptance

5.4.1 Caller ID Output

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.

The AT%G1 command activates the caller ID output function 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 detected by the PSI-DATA/FAX-MODEM/RS232 and output to the

RS-232 interface as follows:

CLIP:0401234…<CRLF>

A telephone number is only then output if a valid caller ID has been detected. It is

only output once for each call. The call is accepted according to S register S0.

5.4.2 Selective Call Acceptance

The PSI-DATA/FAX-MODEM/RS232 can automatically check whether it has been

called from a specific telecommunications cable 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. Store numbers 18 and 19

are reserved for this purpose (&Z18, &Z19).

Example AT&Z18=040 123456789

AT&Z19=0170 123 45 69

If these numbers are stored in these fields and "Selective Answer" is enabled

(AT%G3), 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 S register S0. Your control

system therefore does not have to evaluate the caller ID and the modem makes

sure that only the service numbers (&Z18 and &Z19) 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

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Vega Phoenix PSI Data Fax Modem Bedienungsanleitung Seite 79