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V.250 AT COMMANDS

AT Commands for EV-DO-EV3 Modems

Data Carrier Detect (DCD) Control &C

Set command controls the RS232 DCD output behavior.

Syntax

Command Command type

AT&C[<n>] Set

Parameters and Values

<n>

0 DCD remains high always.

1 DCD follows the carrier detect status: if carrier is detected DCD is high, otherwise

DCD is low. Default: 1.

2 DCD off while disconnecting.

Notes

 If parameter is omitted, the command has the same behavior as AT&C0.

 Reference: V.25ter.

Data Terminal Ready (DTR) Control &D

Set command controls the module behavior to the RS232 DTR transitions.

Syntax

Command Command type

AT&D[<n>] Set

Parameters and Values

<n>

0 Device ignores DTR transitions. Default: 0.

1 DCD follows the carrier detect status: if carrier is detected DCD is high, otherwise

DCD is low.

2 When the module is connected, the high to low transition of DTR pin sets the

device in command mode, the current connection is not closed.

3 Device ignores DTR transitions.

4 C108/1 operation is disabled. Of +CVHU is not 2, issuing AT&D3 is equivalent to

AT&D5.

5 C108/1 operation is enabled. Same behavior as for <n>=2.

Notes

 If +CVHU is not set at 2, issuing AT&D0, AT&D1, AT&D2, AT&D3, or AT&D4 is equivalent to AT&D5.

 If a connection is set up issuing #SKTD, then AT&D1 has the same effect as AT&D2. If a connection is set up

issuing AT#SD then AT&D1 and AT&D2 have different effect, as described above.

 If AT&D2 is issued and the DTR is tied Low, auto answering is inhibited and it is possible to answer only

issuing command ATA.

 If parameter is omitted, the command has the same behavior as AT&D0.

 Reference: V.25ter.

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Multitech CDMA Guía de usuario Pagina 38