Silicon Laboratories SI2493/57/34/15/04, SI2494/39 Table 118. +FCLASS and IDLE State Transitions Expected Response, Table 117. Voice Mode Operations (+FCLASS=8) (Continued)

AN93
Rev. 1.3 191
21 S On-Hook Ring, CID1 FDV DTMF
2Tones*
Await call with tone genera-
tor connections to AOUT for
control beeps, ring tone, etc.
RS232-
>AOUT
* 2Tones =
Detector for
2 pro-
grammed
tones.
Table 118. +FCLASS and IDLE State Transitions Expected Response
Input
Command or
Event
Current Modem Settings
+FCLASS=0,1 +FCLASS=8
+VNH = 0 +VNH = 1 +VNH = 2 +VNH = 0 +VNH = 1 +VNH = 2
ATH o r
DTR off (&D2)
ON-HK ON-HK,
+VNH = 0 OFF-HK,
+VNH = 0 ON-HK,
+FCLASS = 0
+VLS = 0
ON-HK,
+VNH = 0,
+FCLASS = 0
+VLS = 0
ON-HK,
+VNH = 0,
+FCLASS = 0
+VLS = 0
AT&F
ON-HK
+VNH = 0
+FCLASS = 0
ON-HK
+VNH = 0
+FCLASS = 0
ON-HK
+VNH = 0
+FCLASS = 0
ON-HK
+VNH = 0
+FCLASS = 0
+VLS = 0
ON-HK,
+VNH = 0,
+FCLASS = 0
+VLS = 0
ON-HK,
+VNH = 0,
+FCLASS = 0
+VLS = 0
ATZ or
DTR off (&D3)
ON-HK
+VNH = 0
+FCLASS = 0
ON-HK
+VNH = 0
+FCLASS = 0
ON-HK
+VNH = 0
+FCLASS = 0
ON-HK
+VNH = 0
+FCLASS = 0
+VLS = 0
ON-HK
+VNH = 0
+FCLASS = 0
+VLS = 0
ON-HK
+VNH = 0
+FCLASS = 0
+VLS = 0
Key Abort ON-HK OFF-HK OFF-HK ON-HK
+VLS = 0 ON-HK +VLS = 0 ON-HK +VLS = 0
DCE Initiated
disconnects ON-HK OFF-HK OFF-HK ON-HK OFF-HK OFF-HK
+FCLASS = 8
+FCLASS = 8
Go to IDLE
Keep HK
+FCLASS = 8
Go to IDLE
Keep HK
+VNH = 0*
+FCLASS = 8
Go to IDLE
Keep HK
+VNH = 0*
+FCLASS = 0,1
Go to IDLE
Keep HK Go to IDLE Keep HK Go to IDLE Keep HK +FCLASS = 0,1 Go to IDLE
Keep HK
+FCLASS = 0,1
Go to IDLE
Keep HK
+VNH = 0*
+FCLASS = 0,1
Go to IDLE
Keep HK
+VNH = 0*
Notes:
1. “HK”: Hook
2. “Keep HK”: Maintain ON or OFF hook status.
3. *If no +VNH=x command executed since last +FCLASS change.
Table 117. Voice Mode Operations (+FCLASS=8) (Continued)
+VLS Mode Primitive DAA Active
Detectors Description +VTX +VRX +VSP +VTS