Rockwell RCV144ACx, Command Reference Manual

Page: 164 / 186

AT Command Reference Manual
7-32 1048
7.4 S-REGISTERS
The following S-Register is global, meaning that it can be set in any appropriate mode (i.e., any #CLS setting).
S30 - Disconnect Inactivity Timer
Range: n = 0 – 255
Default: 0 (OFF, which means DTE should usually set it to some value for Voice)
Command options:
S30=0 Disconnect Inactivity timer off. No matter how long it might continue, the modem never
spontaneously hangs up the telephone line or switches to autobaud mode as a result of inactivity.
S30=1 to 255 This is the period of time (in seconds), which if expired causes the modem to hang up the
telephone line if it is off-hook and no data has passed during the period. The timer is also active
whenever the #BDR setting is non-zero. In order to avoid a state where speed sense is disabled
(even though the PC can crash, come back up, and try to issue commands at what should be a
supported speed), the inactivity time-out occurs if there is no data passed on the DTE interface
within the S30 period, even if the modem is on-hook. DTE software must not select a nonzero
setting for #BDR until it is ready to establish a telephone call or virtual connection to a speaker or
microphone. When there is an inactivity time out with #CLS=8, the modem always forces #CLS=0
and #BDR=0.
7.5 RESULT CODES FOR VOICE OPERATION
VCON VCON is sent when the modem is configured for voice/audio (#CLS=8), or when after answering
or originating a call, the modem enters the Online Voice Command Mode for the first time.
Typically, this is immediately after an off-hook in answer mode, and after ringback ceases in
originate mode. VCON is also sent when the DTE requests a switch from Voice Transmit Mode to
Online Voice Command Mode by issuing a <DLE><ETX> to the modem, or when the DTE
requests a switch from Voice Receive Mode to Online Voice Command Mode via the key abort.
CONNECT CONNECT is sent when switching from the Online Voice Command Mode to either Voice Receive
Mode via the #VRX command, or to Voice Transmit Mode via the #VTX command. This message
is sent to the DTE to inform it that it may begin receiving or sending ADPCM or PCM data.
7.6 EXAMPLES OF VOICE OPERATION
See Tables 7-7 through 7-13.