Multi-Tech Systems ISIHP-4U manual Online Connection Commands, Qn Asynchronous Communications Mode

Modem AT Commands & S-Registers

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 doesn’t 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.

&Qn Asynchronous Communications Mode

n = 0, 5, or 6 Default: &Q5

Allows you to select the type of asynchronous communications mode for your modem.

Note: These commands are the same as several of the \Nn commands, described later in this chapter.

&Q0 selects asynchronous mode with data buffering. This is the same as \N0, nonerror 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.

Online Connection Commands

The following commands control the conditions of the online connection.

Bn Answer Tone

n = 0, 1, 2, 3, 15, or 16 Default: B1 and B16

Selects the frequency the modem uses for its answer tone. (The answer tone is the tone transmitted by the receiving modem to the calling modem, thus

84 MultiModemISI Hybrid Series, ISIHP-2S/2U/4S/4U/4SD