Appendix A: SPOT Commands - Page 21
SPOT 3 User's Guide
ATV Commands
The table below summarises the ATV (voice) commands
supported by SPOT. All voice commands begin with
AT#V
,
eg.
AT#VD1
to receive voice data.
ATV Commands
D
Set voice data direction
D0
Transmit voice data and disable DTMF
D1
Receive voice data
SD=n
Silence deletion control
SD=0
Disable silence deletion
SD=1
Truncate over 1 second of silence
SD=2
Truncate over 0.5 second of silence
F=n
Voice flow control
F=0
Set receive buffer (FIFO) size in bytes (32, 64, 128, 256)
F=1
Disable receive buffer
G=n
Receive gain setting
0 to 256 sets the gain in the range -6.2dB to 20.8dB (default 119 = 6.4dB)
The default should not be set above 130 in order to comply with BABT
regulatory requirements.
H=n
Voice relay activation
H=0
Telephone (dialling) mode
H=1
Connect to telephone line interface
H=2
Connect to modem interface
SI=n
End of message timer
S
Voice mode activation
S0
Return to data mode (2400 bps)
S1
Voice mode at 115.2 Kbps
S2
Voice mode at 57.6 Kbps
S3
Voice mode at 38.4 Kbps
S4
Voice mode at 19.2 Kbps
SC=n
Set voice compression mode
SC=0
No compression
SC=1
CVSD 14.4
SM=n
Set voice mode encoding/decoding scheme
SM=2
Set voice mode encoding scheme to 8-bit linear
SS=n
Voice sampling rate
SS=1
Set voice sampling rate to 7300Hz
SV
Transmit voice data and receive DTMF
T
Command mode DTMF receive enable/disable
T1
Enable
T0
Disable
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