Avocent Network Adapter EMS1000P Betriebsanweisung PDF herunterladen (Seite 72)

Appendix E: Internal Modem

Some models of the ACS 6000 console server come equipped with an internal modem. This modem is used to

originate and answer phone calls and establish communication with other modems to transmit data.

Controlling the modem’s functions is done by using the “AT” commands. These commands are used to instruct

the modem to perform functions such as dialing or answering calls and are normally automatically issued by

communication software. However, for some applications, custom software may have to be written due to the

absence of a normal operating system.

The modem will automatically accept and process AT commands at most standard DTE (Data Terminal

Equipment) speeds and parity settings. For each command issued, the modem will respond with a result code to

inform you of the modem’s status. The format of a basic AT command and result code is as follows:

AT<Command><CR>

AT = Attention.

<Command> = any valid command

<CR> = Carriage Return or Enter key

OK = Result Code

Command Description

ATDT7678900<CR> Instructs the modem to dial the number 7678900 and attempt to connect to the remote device.

ATS0=2<CR>

Enables auto answer option. When the modem detects a ring, it will attempt to answer after two

rings.

Table E.1: Sample Command String

Command Description

ATA/ Repeat the previous command.

ATA Answer.

ATB0 CCITT operation at 300 or 1200 bps.

ATB1 Bell operation at 300 or 1200 bps (default).

ATD Dial.

ATD0-9 Dial the DTMF digits 0 to 9.

ATDA-D Dial the DTMF digits A, B, C and D.

ATDP Select pulse dialing; effects current and subsequent dialing.

ATDT Select tone dialing; effects current and subsequent dialing.

ATD! Flash: go on-hook by time defined by S29.

ATDW

Wait for dial tone detection before dialing a number. If no dial tone is detected within the time specified by S7,

the modem aborts the rest of the sequence, goes on-hook and generates an error message.

ATD@

Wait for five seconds of silence before proceeding with next dialing string and then complete handshake

sequence.

ATD,

Pause. The modem pauses for a time specified by S8 before dialing the number. Most often used when dialing

an outside line through a PBX.

ATD; Return to the command mode after processing the command.

ATE0 Disables the command echo.

Table E.2: Basic AT Commands

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