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Chapter 5 - AT Commands

layers (the computer) to handle error correction.

!Z=5 V.120 protocol (async, error detection, error correction)

!Z=7 HDLC (async, error detection)

!Z=9 PPP protocol (async, error detection)

!Z=12 X.75 protocol (async, error

detection, error correction)

Digital (Data) Call Commands

Use these commands to make or configure data calls.

A Answer Call

Values: none

Default: none

Forces TA to answer an incoming call. To cause the TA to autoanswer, set register S0 to a

value higher than 0.

Dn Dial

Values: string of up to 25 characters

Default: none

Causes TA to dial a telephone number (e.g., ATD785-3500 <cr>).

DSn Dial Stored Number

Unit: Decimal ASCII code

Values: n=0-9

Default: DS0 (Dial stored number 0)

To dial a stored telephone number, type DSn in terminal mode, where n is the location of the

number you wish to dial. For example, ATDS3<CR> dials a telephone stored in memory

Numbers can be stored by the use of the &Zn=x command.

Hn Hang Up

Values: n = 0 or 1

Default: H0

Forces TA to go off-hook (take control of the telephone line) or go on-hook (hang up). Since

TA goes off-hook automatically when it dials, H command normally is used only to hang up.

To hang up, first escape to command mode (+++AT <cr>), then type ATH (or ATH0) <cr>.

Or, include the hang up command in the escape sequence: +++ATH <cr>.

H0 Go on-hook (hang up).

H1 Go off-hook.

!Hn Digital Call Hold-Off Time

Unit: 1 second

Values: n=0 (disable),

n=1-255 (1-255 seconds)

Default: !H0 (disabled)

When a digital call disconnects a timer will be installed that will hold off incoming digital

calls for the given amount of time (n) for that digital port. Digital calls that are received by that

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Multitech ISIHP-4U Guide de l'utilisateur Page 107