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86 MultiModemISI Hybrid Series, ISIHP-2S/2U/4S/4U/4SD
Modem AT Commands & S-Registers
Nn Modulation Handshake
n = 0 or 1
Default: N1
Controls whether the local modem performs a negotiated handshake with
the remote modem at connection time when the communication speed of the
two modems is different.
N0 enables handshaking only at the communication standard specified by
S37 and the ATB command.
N1 always begins the handshake only at the communication standard
specified by S37 and the ATB command, but allows fallback to a lower
speed as the handshake proceeds. This is the default.
\Tn Inactivity Timer
n = 0
Default: \T0
The inactivity timer specifies the length of time, in minutes, that the modem
waits before disconnecting when no data is sent or received. This timer is
specified in register S30. The \T0 command disables the inactivity timer.
Yn Long Space Disconnect
n = 0, 1
Default: Y0
When two modems are connected in reliable mode, a link disconnect
request packet is sent to request a disconnect. In non-error correction mode,
there is no polite way to request a disconnect. As a result, some garbage
may be received when a hang-up command is issued.
Y0 disables the modems use of the break signal.
Y1 enables long space disconnect.
RS-232 Interface Commands
These commands define how the ISIHP-2S/2U modems use and respond to
standard
RS-232 signals.
&Cn Carrier Detect Control
n = 0 or 1