Silicon Laboratories SI2493/57/34/15/04 - Manual (Page 230)

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230 Rev. 1.3
8.2.1.1. Handshake Tone Detection
Two tone detectors are reconfigured for detection of the 1400Hz and 2300Hz tones. When a valid tone burst is
detected the modem reports it to the host DTE in the V.253 event format as follows.
8.2.1.2. Session Example
Event Modem-to-DTE indication Remarks
1400 Hz tone burst detected 0x10, 0x63 Character pair is sent to DTE
at the end of the valid tone burst.
2300 Hz tone burst detected 0x10, 0x65 Character pair is sent to DTE
at the end of the valid tone burst.
Table 145. Ademco
®
Mode of Operation
Step DTE-to-Modem Command Modem-to-DTE
Indication
Remarks
1 AT*y254:w8686,1AA,CCDF,C73B,C001,0
AT*y254:w868B,1AA,D3D1,C39A,3FFF,DDD
AT*y254:w8690,1AA,C34B,C35F,3FFF,54A0
AT*y254:w8695,C,400
AT*y254:w8697,7BE,E050,CC04,3FFF,345F
AT*y254:w869C,7BE,BF39,CA8D,3FFF,37B5
AT*y254:w86A1,C,300,C00,CCD OK
OK
OK
OK
OK
OK
OK Initialize 2300 Hz tone detector.
Note: This step must be done
after a reset or ATZ. But it is not
needed for every call.
2 AT*y254:w86A5,100,2A44,C480,C001,0
AT*y254:w86AA,167,25BC,C22F,3FFF,EC95
AT*y254:w86AF,167,303D,C21E,3FFF,BEF2
AT*y254:w86B4,C,400
AT*y254:w86B6,812,1E2F,C772,3FFF,D55F
AT*y254:w86BB,939,3394,C6FC,3FFF,D345
AT*y254:w86C0,1000,0,0,0,0
AT*y254:w86C5,C,140,8c0,CCD OK
OK
OK
OK
OK
OK
OK
OK Initialize 1400 Hz tone detector.
This step must be done after a
reset or ATZ. But it is not needed
for every call.
3 ATE0:UAD|40
AT:UAD&FF7F
OK
OK
Set UAD.6 to enable Ademco
mode tone detections.
Clear UAD.7 to disable SIA
mode.
5 AT:R48 0064 DTE reads and records what is
the normal “tone off” duration for
DTMF dialing. This parameter is
country dependent. This param-
eter will be modified for Data
Tones transmission later.
6 AT+FCLASS=8 OK Put modem into V.253 voice
mode.