MT9234ZBA-USB-CP【PDF 56/66 页】MODEM V.92 DATA/FAX USB WORLD

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Chapter 4 – Voice Commands

+VPP

Description:

Syntax:

Values:

Result Codes:

+VPR

Description:

Syntax:

Values:

Result Codes:

Enable or Disable Voice Mode Packet Protocol

The +VPP command enables and disables the Packet protocol for Voice mode

operation, and handles the new unsolicited Voice mode result codes. The Packet

protocol is used to detect lost octets on the modem-to-PC serial link, and to recover

the lost octets by requesting retransmission. The Packet protocol assumes that the

data corruption is not a problem on the communications link, the last octet sent will

never be lost due to data overrun (i.e., that the newer octets always overwrite

previous octets in the communications input buffer, a common UART design feature).

Several PC processes can cause serial input channel neglect for longer than the

Protocol time between asynchronous characters (typically less than 521

microseconds), and data loss can occur. If a character is lost in the received data,

the playback of the voice data may be impaired or lost. If a character is lost in the

final result code, the connection may fail. The Packet protocol permits recovery from

such data loss.

AT+VPP=<enable>

0, 1; (2–255 reserved for future standards)

OK if the modem accepts the command.

ERROR if the <enable> value is out of range.

Select DTE/DCE Interface Rate (Turn Off Autobaud)

The +VPR command causes the modem to select between various fixed modem-to-

PC interface rates and autobauding. The selected fixed interface rate stays in effect

until the modem selects another interface rate or autobauding, or until the modem

returns to autobauding on the expiration of the Inactivity Timer. The newly selected

rate takes effect after the modem returns the OK result code.

AT+VPR=<rate>

+VPR=0 select autobauding

+VPR=1 select 2400 bps

+VPR=2 select 4800 bps

+VPR=3 select 7200 bps

+VPR=4 select 9600 bps

+VPR=5 select 12000 bps

+VPR=6 select 14400 bps

+VPR=7 select 16800 bps

+VPR=8 select 19200 bps

If the modem claims support for autobauding (+VPR=0), it means that the modem

can accept AT commands at 2400 bps at all times while in Voice command mode

and with +VPR=0.

OK if the modem accepts the command.

ERROR if the <rate> value is out of range.

Multi-Tech Systems, Inc. AT Commands for the MultiModem & SocketModem MT9234 Series (S000434H)

56

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