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 <DLE><c> is sent to DTE
at the end of the valid tone burst.
2300 Hz tone burst detected 0x10, 0x65 Character pair <DLE><e> 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.