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COURIER HIGH SPEED MODEMS
Data Mode Operations 4-29
In non-ARQ mode, a Courier set to &I5 operates as
though flow control were disabled (&I0); it does not look
for your typed XON/XOFF commands. However, it
looks for XON/XOFF characters coming in over the phone
link. When the remote operator sends XON/XOFF com-
mands, the Courier either resumes or stops transmitting
data over the link and drops the characters from the data
stream.
If both modems are set to &I5, operators at each end can
signal the remote modem to stop sending, thereby
controlling the data flow on the phone link and
preventing their own modem's buffer from overflowing.
At the computer or terminal/modem interfaces, the
modems independently control the flow of data through
their Transmit Data (&H) settings.
Guidelines
Use of software flow control may prove satisfactory if you're
only transferring text files. However, if you're transferring non-
text (binary) files, or using an Xmodem-type protocol, disable
flow control entirely (&R1, &I0). In addition, set the modem to
&B0 and &N0, so that the serial port and connection rates are
equal.
S-REGISTERS
The S-Registers are used to set various timing parameters,
redefine selected ASCII characters, and other configuration
options. A detailed summary of the S-register functions is in
Appendix B. A less detailed summary is in the Quick-Reference
card.
Sr=n Set S-Register value: r is any S-Register; n must be a decimal
number between 0 and 255.
Sr.b=n Alternative command for setting bit-mapped registers: r is the
bit-mapped register; .b is the bit; n is 0 (off) or 1 (on).
Sr? Query contents of register r.