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Chapter 12 – No Prefix Commands

CDMA 1xEV-D0 AT Commands Reference Guide (Document S000482B) 45

Chapter 12 – No Prefix

Commands

+++ Escape

Syntax: +++

Description: The +++ Escape Sequence is not preceded by AT. Applies only to asynchronous calls.

Used to exit data state and enter command state; this is not preceded by AT and does not

require <CR>.

The escape character is fixed as the plus sign “+” (0x2B). The guard time between normal

transmission data and the escape sequence is specified as 1 second and cannot be

changed. Therefore, the modem requires a minimum of 1 second of inactivity on the serial

input, three plus sign characters, followed by 1 second of inactivity.

If a PPP session is active, then use PPP to escape data state.

A Answer (Manual)

Syntax: ATA

Description: Instructs the modem to immediately go off-hook and attempt to establish a connection

without waiting for a ring. This is used to answer an incoming call if auto answer (S0) is

disabled.

The command presumes a RING has been received. If the command is issued without a

RING, behavior depends on the state. If the modem is in command state, it replies with

OK and remains in command state. Should the modem be in pass through state without a

call pending, the Answer command is sent to the IWF modem. This typically goes off-

hook and looks for the carrier. When none is detected, the NO ANSWER or NO CARRIER

result is returned. This is, however, dependent on the IWF modem.

The modem looks for the carrier to negotiate the connection and issues either:

• CONNECT and enters data state; or,

• NO CARRIER and remains in command state.

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