001-0003-822 Rev 1
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AT&Sn
DSR Configuration:
This parameter determines how the modem controls the state of the Data Set
Ready circuit. Default value AT&S0.
AT&S0 DSR always ON.
AT&S1 DSR ON when the RF signal present and phone registered on network.
AT&S2 DSR ON when connected to CDMA.
AT&S3 DSR always OFF.
AT&S4 DSR controlled via I/O control feature.
AT&Qn
CTS Configuration:
This parameter determines how the modem controls the state of the Clear to
Send circuit. Default value AT&Q0.
AT&Q0 CTS always ON.
AT&Q1 CTS always OFF.
AT&Q2 CTS flow control, terminal sets CTS low if it is unable to accept data
from host.
AT&Q3 CTS follows state of RTS.
AT&Q4 DSR Controlled via I/O control feature.
AT&Cn
DCD Configuration:
This parameter determines how the modem controls the state of the Carrier
Detect circuit. Default value AT&C1.
AT&C0 DCD always ON.
AT&C1 DCD ON when connected to remote host.
AT&C2 DCD always OFF.
AT&C3 DSR controlled via I/O control feature.
AT&Nn
RI Configuration:
This parameter determines how the modem controls the state of the Ring
Indicator circuit. Default value AT&N1.
AT&N0 RI always ON.
AT&N1 RI tracks incoming ring pulse.
AT&N2 RI always OFF.
AT&N3 RI controlled via I/O control feature.
AT&N4 RI acts as watchdog output (changes state once per second under
normal conditions).
