Multi-Tech Systems MT2834MR6 - Manual (Page 50)

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Chapter 3 - AT Commands
&E5 XON/XOFF Flow Control
XON/XOFF flow control is an in-band method of data flow regulation used by the modem or
computer (i.e., by flow control or pacing). If you issue the &E5 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.
In-band data regulation means that the XON and XOFF characters (^Q and ^S, respectively)
are inserted into the stream of data rather than using separate control lines. When an XOFF
character is detected, the data stream is suspended until an XON character is detected. The
drawback to using this method of pacing is that some files may contain these characters. If
such a file is transferred using a modem, the file transfer can be suspended indefinitely.
&En XON/XOFF Pass-Through
n = 6 or 7
Default: &E6
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 datacomm link to the remote modem,
thereby pacing the remote modem as well.
&E6 causes the modem to respond to and discard the XON and XOFF characters.
&E7 causes the modem to respond to the characters and pass them through the data link to
the receiving modem.
&En Hewlett Packard ENQ/ACK Pacing
n = 8 or 9
Default: &E8
If the MT2834MR6 is used with Hewlett Packard (or compatible) equipment, it can be
configured to respond to ENQ/ACK pacing as a complement to any other form of active flow
control or pacing. In that case, pacing from the Hewlett Packard equipment is processed
according to the HP protocol.
&E8 causes the modem to ignore ENQ/ACK pacing.
&E9 causes the modem to respond to the ENQ (^E) and ACK (^F) characters.
&En Non-Error Correction Mode Flow Control
n = 10 or 11
Default: &E10
When two modems are connected in non-error correction mode, XON/XOFF flow control
can be used as a complement to XON/ XOFF pacing.
&E10 disables non-error correction mode flow control.
&E11 enables non-error correction mode flow control.