User guide

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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
register 3 location. Stored numbers can be reviewed by giving the command ATL<CR>.
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