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50 Special Functions
EDR detection (either CNG or DTMF tones) will be disabled once
detection occurs. However, a customer’s program might not
answer because the setting of the software may require multiple
rings to answer. S51 bits 0-1 control the number of rings that the
modem will report once the CNG or DTMF tone is detected.
The timing relationship between the Caller ID (if enabled), EDR,
and ring detection is as follows:
ring1 ring2 ring3
***--------***--------***------------------------------
3sec 3s 3s 3s S7 time-out
+------+---+------+---+------+---+-------------+----
CID/EDR RD EDR RD EDR RD EDR RD
CID=Caller ID task RD=Ring Detection task EDR=EDR task
OONOTE: DURING THE EDR PERIOD, ANY AT COMMAND WILL DISABLE THE EDR
FUNCTION.
EDR Application Example
If we use ZFAX as our fax receiving application and we don’t want
it to answer the call unless it is a fax call, the way to set it up would
be:
1. Set ZFAX to answer on 2 rings.
2. Set S51.0=1 to enable EDR and report RING twice. The
modem will not report a normal RING and ZFAX will not
answer a call unless EDR RING is reported.
3. Set S51.4=1 to enable fax CNG tone detection. It is reported as
RING.