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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>
OK
AT = Attention.
<Command> = any valid command
<CR> = Carriage Return or Enter key
OK = Result Code
Command Description
ATDT7678900<CR>
Instructsthemodemtodialthenumber 7678900andattemptto
connecttothe remotedevice.
ATS0=2<CR>
Enablesautoanswer option.Whenthemodem detectsaring,itwill
attempttoanswer after two rings.
Table E.1: Sample Command String
Command Description
ATA/ Repeatthe previouscommand.
ATA Answer.
Table E.2: Basic AT Commands
Appendices 80