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MultiModemISI Hybrid Series, ISIHI-2S 73
Chapter 4—MODEM AT Commands, S-Registers, Result Codes
Modem
X1 causes the modem to blind dial, but in addition to the basic CONNECT
code, it
provides extended codes consisting of the word CONNECT
and the speed of the
connection (CONNECT 14400
or
CONNECT 28800
,
for example). In this mode, the
modem does not recognize or respond to dial tones or busy signals.
X2 causes the modem to wait for a dial tone before dialing. If it does not detect a dial
tone within the time set by S6, the modem sends a NO DIALTONE result code to the
terminal. In this mode, the modem provides extended result codes but does not respond
to busy signals.
X3 causes the modem to blind dial, but also it looks for a busy signal, and if it detects
one, it sends a BUSY
result code to the terminal. In this mode, the modem provides
extended result codes, but it does not respond to dial tones.
X4 causes the modem to look for a dial tone and a busy signal, and respond with NO
DIALTONE or BUSY, as appropriate. It also provides extended result codes. It is the most
useful setting for most data communication programs and is the default setting.
X5 causes the modem to look for a dial tone and a busy signal, and response with NO
DIALTONE or BUSY, as appropriate. It also provides extended result codes. It is the most
useful setting for most data communication programs and is the default setting.
X6 causes the modem to look for a dial tone and a busy signal, and respond with NO
DIALTONE or BUSY, as appropriate. It also provides extended result codes. It is the most
useful setting for most data communication programs and is the default setting.
X7 causes the modem to wait for a dial tone before dialing. If it does not detect a dial
tone within the time set by S6, the modem sends only the basic result code to the
terminal (ERROR, NO CARRIER, or CONNECT, for example). In this mode, the modem
does not respond to busy signals.
&Q
n
Asynchronous Communications Mode
n
= 0, 5, or 6
Default: &Q5
The &Qn command allows you to select the type of asynchronous communications mode
for your modem.
Note: These commands are the same as several of the \N
n
commands, described later
in this chapter.
&Q0 selects asynchronous mode with data buffering. This is the same as \N0, non-error
correction mode with data buffering.
&Q5 selects error control with data buffering. This is the same as \N3, V.42/MNP auto-
reliable mode.
&Q6 selects asynchronous mode with data buffering. This is the same as \N0, non-error
correction mode with data buffering.
%B View Numbers in Blacklist
If blacklisting is in effect, this command displays the numbers for which the last call
attempted in the previous two hours failed. In countries that do not require blacklisting,
the ERROR result code appears.