11
CHAPTER 4: Operation
COMMAND
DESCRIPTION/RANGE —SIZE
ATI0
Identification Code
ATI1
Identification Code
ATI2
“OK” response if checksum verifies
ATI3
Revision number
ATL0
Lowest volume setting
ATL1
Same as ATL0
ATL2
Medium volume setting
(default)
ATL3
Maximum volume setting
ATM0
Speaker always off
ATM1
Speaker on until carrier is detected
(default)
ATM2
Speaker always on
ATM3
DTMF Tones are not heard, but speaker is on until carrier detected
AT0
Originate immediate or return to data mode
ATQ0
Enable result code
(default)
ATQ1
Disable result code
ATS
n
?
Provide S Register Value (
n
=0—27)
ATS
n
=
Set register value (
n
=0—27)
ATV1
Verbose response
(default)
. See ATV0 for response.
ATW0
Negotiation process result codes not returned
(default)
ATW1
Negotiation process result codes returned
ATX0
Enable result codes 0—4
ATX1
Enable result codes 0—5
ATX2
Enable result codes 0—6
ATX3
Enable result codes 0—5, 7, and 10
ATX4
Enable result codes 0—10
(default)
ATY0
Disable long space disconnect
(default)
ATY1
Enable long space disconnect
ATZ0
Software reset, restore S Register from Profile Location 0
ATZ1
Restore S Register
AT&C0
EIA carrier line always forced on
(default)
AT&D0
DTR always on
(default)
AT&D1
Modem goes to command mode when DTR goes Off