Xn XON/XOFF Pass-Through | Multi Tech Equipment ISIHI-2S manual

Modem

Chapter 4—MODEM AT Commands, S-Registers, Result Codes

control lines. When an XOFF character is detected, the data stream is suspended until an XON character is detected. If you issue the &K4 command to the modem, it will respond to XON/XOFF pacing, and use XON/XOFF characters as its own method of flow control to the computer. (This is the same as &K4.)

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 modem’s 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 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. This is the default.

&Jn Auxiliary Relay Control

n = 0 Default: &J0

The &J0 command causes the auxiliary relay to remain open. It is never closed. This is the default, and the only supported command format.

\Gn Modem Port Flow Control

n = 0 Default: \G0

This command returns an OK for backward compatibility with some software.

\Jn Data Buffer Control

n = 0 Default: \J0

This command enables data buffer control. Serial port speed is independent of connect speed.

\J0 enables data buffer control. This is the default, and the only supported command format.

80	MultiModemISI Hybrid Series, ISIHI-2S

ISIHI-2S specifications

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Multi Tech Equipment ISIHI-2S manual Xn XON/XOFF Pass-Through, Jn Auxiliary Relay Control

Models: ISIHI-2S