Chapter 3 – Voice Commands

Command: +VNH=

Automatic Hang-up Control

 

 

 

 

 

Description:

This command enables or disables automatic hang ups.

 

 

 

 

Syntax: +VNH=<hook>

 

 

 

 

 

Values:

<hook> Decimal number corresponding to the selected option.

 

 

 

0

 

Modem enables automatic hang ups as is normal in other modes.

 

 

1

 

Modem disables automatic hang ups usually found in the other non-

 

 

 

 

voice modes.

 

 

 

 

 

 

 

2

 

The modem disables automatic hang ups in the other non-voice modes.

Default:

0

 

 

The modem performs a “logical” hang up (returns OK result code).

 

 

 

 

 

 

 

 

 

Report Commands:

+VNH?

Reports current or selected values.

 

 

 

Command Responses:

+VNH=?

Reports supported range of parameter values.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Automatice Hang-up Command Responses

 

Command

 

No Carrier Present

 

ATH

 

ATZ

 

DTR & D2

 

+VNH=0

 

 

Y

 

Y

 

Y

 

Y

 

+VNH=1

 

 

N

 

Y

 

Y

 

Y

 

+VNH=2

 

 

N

 

N

 

N

 

Y

 

Notes:

 

 

 

 

 

 

 

 

 

 

Y = will hang up; N = will not hang up

 

 

 

 

 

 

How +VNH is reset:

 

 

 

 

 

 

DTE uses +VNH command to change the setting.

 

 

 

 

DTE issues another +FCLASS mode change without issuing another +VNH.

 

A hang-up event occurs (see this table).

 

 

 

 

 

 

DTE issues +VIP command.

 

 

 

 

 

Command: +FLO

Flow Control

 

 

 

 

 

Function:

Select Flow Control Method

 

 

 

 

 

Values:

0, 1, 2, 3-255

 

 

 

 

 

 

 

 

Result Codes:

OK or ERROR

 

 

 

 

 

 

 

 

Description:

The +FLO? command lets you select the method of flow control provided and used by the

 

modem. If +FLO=0, some other method (such as credit flow control) is used. The Xon-Xoff

 

method is required. Xon is the ASCII character <DC1> (11 hex). Xoff is the ASCII

 

character >DC3> (13 hex). CCITT V.24 circuits 106 and 133 are optional flow control

 

methods. If circuits 106 and 133 are not used (+FLO<>2), then circuit 106 is held On

 

whenever +FCLASS=8.

 

 

 

 

 

 

In Voice mode, circuit 105 has no effect on the state of transmitted data. (Circuit 133

 

normally reverts to use as circuit 105 (RTS) when not used for Flow Control.)

 

 

+FLO=0

 

Disables Xon-Xoff and 133/105 flow control

 

 

 

 

+FLO=1

 

Enables Xon-Xoff flow control in either direction

 

 

+FLO=2

 

Enables CCITT Circuit 133 for flow control of the modem by the PC; use

 

 

 

CCITT Circuit 106 for flow control of the PC by the modem.

 

+FLO=3-255 Reserved for future standards.

Multi-Tech Systems, Inc. AT Commands Reference Guide (S000273G)

29

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Multi-Tech Systems MT5600BA-V92 manual Command +VNH= Automatic Hang-up Control, Command +FLO Flow Control
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