Syntax and Parameters 5-11
MX2A137REFGD Revision A MX2 Reference Guide
F#
Flow Control
This option allows you to specify what type of flow control to use for the
file transfer.
Flow control is the ability of the receiver to detect that data is coming in
faster then it can receive it and to issue a command to the sender
instructing it to stop sending data. When the receiver is again able to
handle new data, it issues another command instructing the sender to
resume the transfer of data.
XFER supports two types of flow control: software (XON/XOFF) and
hardware (RTS/CTS). Only one type can be used at a time. The sender
and receiver should have this option enabled similarly.
To use the F option, replace the # symbol with the desired setting:
0 - No flow control
1 - XON/ XOFF (Zmodem only)
2 - RTS/ CTS
Note: XON/XOFF cannot be used with Xmodem protocol, because
Xmodem protocol sends raw binary data and cannot
distinguish between the XON/XOFF characters and file data.
Attempting to specify XON/XOFF with Xmodem protocol will
result in an error.
If you do not include the F option in the command line, no flow control
is used. If you use the F option without specifying a number, it is
assumed to mean F0, or no flow control. This is useful in the case where
flow control is specified in the XFER_ARGS environment variable but
you wish to turn flow control off for the current transfer session. An
invalid setting will result in an error on the command line.
On a MX2, XON/XOFF flow control is the default when transferring
with Zmodem.
