US Robotics COURIER - Page 47

COURIER HIGH SPEED MODEMS
DTE. When you send a <Ctrl>-Q (XON) command, the modem
resumes. (Hold down the Ctrl key and press the letter. Don't
type the angle brackets. The brackets indicate a special, named
key on the keyboard.)
WARNING: In ordinary operation, the only characters the
modem recognizes during a call are the three pluses(+++) of the
escape code. But when software flow control is enabled, the
modem also looks for <Ctrl>-S or <Ctrl>-Q characters. If these
characters
occur in a file or as part of a protocol, the modem
reads them as XON /XOFF characters and acts on them. In some
cases, the modem drops them from the data stream.
&IO Disables XON /XOFF flow control of received data.
Default. Recommended for non-ARQ (Normal mode)
calls, but see &IS. The IO option provides transparency for
all characters except the escape
code sequence(+++),
because at this setting the modem does not look for
control characters.
NOTE: Because of
the risk described in the above
warning, the settings that follow are only recommended
for users whose data does not include XON /XOFF control
characters.
&Il The
Courier acts on your typed XON /XOFF commands,
and passes them to the remote computer. Use in ARQ
mode only, but keep in mind that the XON/XOFF
characters sent to the remote computer may interfere with
XON /XOFF signaling between the remote computer and
remote modem. See &I2.
&I2 The
Courier acts on your XON/XOFF commands, but
removes them from the data stream instead of passing
them to the remote computer. This ensures that the
remote computer does not confuse your XON /XOFF
characters with those from its attached modem. This is
the recommended setting for ARQ mode.
However, if the call is not in ARQ mode, there is no flow
control
on the phone link. If you send an XOFF to your
modem and it stops passing data, it has no way to tell the
remote computer and modem to stop sending for a while,
and your modem's buffer may overflow. For more
reliable control in non-ARQ mode, see &IS.
4-10 Interface Controls
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-