Appendix

&Dn

Data Terminal Ready Control

 

n = 0, 1, 2, or 3

 

&D0

Modem ignores DTR signal

 

&D1

When DTR drops while in online data mode, the modem enters command mode, issues

 

 

an OK, and remains connected

 

&D2

When DTR drops while in online data mode, the modem hangs up

 

&D3

When DTR drops, modem hangs up and resets as if ATZ command had been issued

DSn

Dial Stored Telephone Number

 

n = 0, 1, 2, or 3

 

Dial a number previous stored in directory number n by &Zn= command. For example, ATDS3

En

Echo Command Mode Characters

 

n = 0 or 1

 

E0

Do not echo command mode characters

 

E1

Echo command mode characters

+ES=6

Enable Synchronous Buffered Mode

 

Allows an H.324 video application direct access to the synchronous data channel. On underflow,

 

the modem sends the HDLC flag idle (0x7E) to the remote modem. This special error correction

 

mode is overridden by any of the following commands: &F, &M, &Q, and \N.

 

+ES=? Shows the only allowed value

Fn

Echo Online Data Characters

 

n = 1

 

 

F1

Disable online data character echo (included for backward compatibility with some

 

 

software)

&Fn

Load Default Configuration

 

n = 0

 

 

z&F0

Load factory default values as active configuration

&Gn

Guard Tones (International model only)

 

n = 0, 1, or 2

 

&G0

Turn off ITU-T guard tones

 

&G1

Turn on ITU-T 550 Hz guard tone

 

&G2

Turn on ITU-T 1800 Hz guard tone

 

Note: The UK model is locked to &G2, which turns on the ITU-T 1800 Hz guard tone.

\Gn

Modem Port Flow Control

 

n = 0

 

 

\G0

Returns an OK for backward compatibility with some software.

Hn

Hook Control

 

n = 0 or 1

 

H0

Go on-hook (hang up)

 

H1

Go off-hook

In

Information Request

 

n = 0, 1, 2, 3, 4, or 9

 

I0

Display default speed and controller firmware version.

 

I1

Calculate and display ROM checksum (for example,12AB)

 

I2

Check ROM and verify the checksum, displaying OK or ERROR

 

I3

Display default speed and controller firmware version

 

I4

Display firmware version for data pump (for example, 94)

 

I9

Display country code (for example, NA Ver. 1)

&Jn

Auxiliary Relay Control

 

n = 0

 

 

&J0

The auxiliary relay is never closed.

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Multi Tech Equipment manual MultiModemISI Hybrid Series, ISIHI-2S 153

ISIHI-2S specifications

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