
MultiModem ISI Hybrid Series, ISIHI-2S/2U 81
Chapter 4—MODEM AT Commands, S-Registers, Result Codes
The drawback to using this method of pacing is that some files may contain these
characters as part of the file data. If such a file is transferred using a modem with XON/
XOFF flow control enabled, the file transfer could fail due to indefinite suspension.
\Q3 enables modems use of Clear to Send (CTS) signal on the RS-232/V.24 interface to
regulate data flow. When CTS drops, data flow is suspended until the signal goes high
(on) again. This method of flow control works in conjunction with pacing (i.e., computer-
initiated flow control), which uses the Request to Send (RTS) signal on the RS-232/V.24
interface. Hardware flow control cannot be enabled unless an active error correction
protocol is selected. This is the factory default setting. (This is the same as &K3.)
\Xn XON/XOFF Pass-Through
n = 0, 1
Default: \X0
When XON/XOFF pacing is active, the local modem has two options regarding the XON
and XOFF characters. It can respond to and discard the characters from the computer, or
it can respond to the characters and pass them through the data communications link to
the remote modem, thereby pacing the remote modem as well.
\X0 causes the modem to respond to and discard the XON and XOFF characters (default)
\X1 causes the modem to respond to and pass on the XON and XOFF characters
\Jn Data Buffer Control
n = 0
Default: \J0
\J0 disables force line rate less than or equal to DTE rate
\J1 enables force line rate less than or equal to DTE rate
\Kn Set Break Control
n = 0, 1, 2, 3, 4, 5
Default: \K5
Determines how the modem processes a break signal received from the local DTE during
an online connection.
\K5 causes the modem to send the break to the remote modem in sequence with
transmitted data, non-destructive, non-expedited.
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