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Bits
Bin.
Dec.
(1,0)
00
0
01
1
10
2
11
3
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. S51 bits 0-1 control the number of rings that the modem will
answer to 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
+------+---+------+---+------+---+-------------+----
CID/EDR RD EDR RD EDR RD
CID=Caller ID task
Note: During the EDR period, any
10.5.2 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:
Special Functions
Description
Disable EDR (default).
Report RING twice.
Report RING four times.
Report RING six times.
S7 time-out
EDR
RD=Ring Detection task
AT
command will disable the EDR function.
U-90E Data/Fax Modem
RD
EDR=EDR task
10-11
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