Table of Contents
Advertisement
"AT" Commands Supported
A/
Repeat Previous Command
The "A/" command causes the previous command input string to be re-parsed and commands re-executed
exactly as before. This command must appear alone in a command input string and must not have an "AT"
prefix. It does not require a carriage return since the parser begins re-parsing the previous command input
string upon receipt of the '/' character.
A
Answer a call
The "A" command causes the modem to answer. Any commands in the command input string appearing after
the "A" command are ignored. This command may be chained after other commands, but it is not meaningful
to chain other commands after it.
D<string>
Dial a Number
The "D<string>" (dial command) causes the modem to proceed to originate mode. This command may be
chained after other commands. The dial string is made up of two parts, the destination telephone number and
optional dial modifiers. The total length of the dial string (including the "d") is 50 characters.
The characters after the command character 'D' are processed as follows:
All valid address digits and characters are processed in the order received. These characters are '0', '1', '2', '3',
'4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', '*' and '#'.
Two additional characters (the comma "," and the letter "R") are valid when the Modem Sharing option
"Reverse Dial" option is enabled and when the t (tone) command immediately follows the d (dial) command in
the dial string.
Commas add delay(s) to the call progress and are most commonly used when dialing a destination that initially
answers with an automated attendant. For example, ATDT17637853500,,,,,5315 (with the 5315 being entered
as the extension of the final destination).
The letter R instructs the MultiAccess modem to switch to answer mode after dialing. When the R is
processed, it's echoed back to the host as a comma (for example: ATDT17637175038R is echoed back as
ATDT17637175038,). See the Modem Usage section "Reverse Dial" found in Chapter 3 of the User's Guide,
for complete details.
Dial modifier characters that are accepted but are discarded (have no function). These characters are 'P', 'W',
'@', '!', ';', ')', '(', '-', ' ' (space), '"' and 'I'. The dial modifier t (tone command) is accepted but discarded when
the Reverse Dial option is disabled.
All other characters cause the result code to be set to "ERROR" and the parser to abort.
En
Echo
This command controls the echoing of command characters back to the host.
"E0" disables echoing to host (DEFAULT setting as of version 1.12).
"E1" enables echoing to
Hn
Hang Up
The "Hn" command causes the link to be terminated. The valid range of n is 0 to 1 but the value has no effect.
This command is also accepted in the Idle state, but has no effect. The result code remains "OK".
MultiAccess Communications Server MA30120 User Guide
host.
Appendix B – Modem Commands
144
Advertisement
Table of Contents
