Multitech BA-Series Guida Utente Scaricare il pdf (Pagina 34)

Chapter 5 - Command Mode

Multi-Tech Systems, Inc. MT2834BA/BL Series User Guide

To activate DTR Dialing, enter AT$D1 and hit RETURN. The modem dials the phone number stored

in the N0 location of memory when it receives a high DTR signal. DTR must remain high for the

duration of the call, until disconnect. To deactivate DTR dialing, enter AT$D0 and hit RETURN.

Note when using DTR Dialing in a synchronous application, be sure DIP-Switch #8 is in the UP

position to disable V.25bis Command mode.

Voice/Data Dialing $VD

Another alternate method of causing the modem to automatically dial is Voice/Data Dialing. With

Voice/Data Dialing, the modem automatically dials the phone number stored in the N1 position of

memory whenever the Voice/Data switch is toggled. You must first enter AT$VD1&W0<CR>. This

command string enables Voice/Data dialing when the Voice/Data toggle switch is activated. To

disable Voice/Data Dialing (default), enter the command AT$VD0 W0<CR>.

5.4.2 Dial Modifier Commands

There are several command characters that can be included within a dialing command (following the

letter D), called “Dial Modifiers”. They have various functions, including the selection of Pulse or Tone

Dialing, pauses in the dial sequence, automatic re-dials if a number is busy, and reverting to the

Command mode or switching to the Answer mode after dialing.

Pulse or Tone Dial P T

The modem dials numbers using either pulse or tone dialing, or a combination of both methods.

Pulse dialing is a method used by rotary-dial telephones, which involves the timed opening and

closing of line relay.

Tone dialing is the method used by push-button (touch tone) telephones, and is sometimes referred

to as DTMF, or Dual-Tone Multi-Frequency dialing.

The method used is selected by including a P for Pulse or a T for Tone in the dialing command, right

before the digits you wish to have dialed in that manner.

For example, you would pulse-dial the number 555-1212 by entering ATDP5551212 and hitting

RETURN. You could tone-dial the same number by entering ATDT5551212 and hitting RETURN. If

neither Pulse nor Tone dialing is specified in the dial command, the modem uses whatever method

used last. If the modem has been reset or just powered up, it uses Pulse dialing, even if the letter P is

not included in your dial command.

Nearly all telephone systems in the U.S. are now compatible with tone dialing. Since that is the faster

method, you will probably choose the tone method for your dialing.

An example of combining pulse and tone dialing could involve a PBX system where 9 had to be

pulse-dialed first, then the rest of the number tone-dialed after pausing for a second dial tone. The

number would be dialed by entering ATDP9, T5551212 and RETURN. (The comma causes a pause,

which we’ll explain soon.)

Set Pulse Dial Ratios &P

This command sets the time ratios between the open and closed portions of the dialing pulse

frequencies. To set the dialing pulse ratio of 60 mSec to 40 mSec, enter AT&P0. To set a ratio of 67

mSec to 33 mSec, enter AT&P1. The factory default is &P0.

1 2 ... 29 30 31 32 33 34 35 36 37 38 39 ... 119 120

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Table des matières

Television

Contents

Installation

Location

Brightness

Equalizer

MoveOOOOOSkip

Kong/South

Europe/China/Africa/CIS)

(USA/Korea/Philippines)

ProgrammeOedit

Programme

Selecting

(option)

ChildOlock

S-VIDEO VIDEO

S-VIDEO VIDEO L/MONO

Troubleshooting

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