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Table 20 DTR Descriptions
DTR
Description
AT&D0
Ignore DTR.
If in the Online Data State, upon an on-to-off transition of DTR, the modem enters Online Command
AT&D1
State and issues an OK result code; the call remains connected. Otherwise, ignore DTR.
If in the Online Data State or Online Command State upon an on-to-off transition of DTR, the modem
AT&D2
performs an orderly clear-down of the call and returns to the command state. Automatic answer is
disabled while DTR remains off.
The modem auto-dials the default remote station upon an off-to-on transition of DTR and enters the
AT&D4
Online Data State. The modem ends the call and enters the command state upon an on-to-off
transition of DTR.
The modem auto-dials the default remote station upon an on-to-off transition of DTR and enters the
AT&D5
Online Data State. The modem ends the call and enters the command state upon an off-to-on
transition of DTR.
Upon an on-to-off transition of DTR, the modem performs an orderly clear-down of any session and
AT&D6
turns OFF the RF module. Upon an off-to-on transition of DTR, the modem turns ON the RF module and
reestablishes the radio session.
Upon an on-to-off transition of DTR, the modem performs an orderly clear-down of any session and
AT&D7
turns OFF the RF module. Upon an off-to-on transition of DTR, the modem turns ON the RF module and
reestablishes the radio session.
The modem auto-dials the default remote station upon determining DTR is OFF and enters the Online
AT&D8
Data State. The modem ends the call and enters the command state upon determining DTR is ON.
The modem auto-dials the default remote station upon determining DTR is ON and enters the Online
AT&D9
Data State. The modem ends the call and enters the command state upon determining DTR is OFF.
• Flow Control
Sets the Flow Control to None or Hardware control.
• DSR
Sets the Data Set Ready to Always On, On When Available, On When Connected or Always Off. The DSR parameter
determines how the modem controls the state of the Data Set Ready circuit. The default value is Always Off.
― Always On: DSR is always on.
― On When Available: DSR is on when the RF signal present and phone registered on network.
― On When Connected: DSR is on when connected to CDMA.
― Always Off: DSR is always off.
• DCD
The DCD parameter determines how the modem controls the state of the Carrier Detect circuit and the amber DCD
LED on the front panel. The default value is Connect On.
― Always On: DCD is always on.
― Connect On: DCD is on when connected to a remote host.
― Always Off: DCD is always off.
Vanguard 3000 Series Multicarrier Cellular Data Modem & IP Router PN 001-7300-100 Rev. B
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