User's Manual

39
3.0 Modem Setup Options
The DTE-DCE Flow Control options are available for Hayes, V.25 bis, Dumb,
and Leased-Line modes (except V.33).
• NONE — No flow control is used.
• RTS ON/OFF — The Request to Send signal controls
data flow from the modem to the terminal.
• DC1/DC2 — Inserts control characters (CONTROL-R and CONTROL-Q)
in the data stream stop and start the flow of data from a device.
• DC1/DC3 (X-ON/X-OFF) — The most common method of flow control.
It inserts control characters into the data stream: CONTROL-S stops the
flow of data, and a CONTROL-Q restarts it.
NOTE
When using the modem for binary file transfer, in-band flow control (flow
control using control characters) must be disabled. In this case, use
hardware flow control or, as an alternative, lower the DTE speed to
lessen the possibility of overflow.
The DCE-DTE Flow Control options are available for Hayes, V.25 bis, Dumb,
and Leased-Line modes (except V.33). All information given above under
DTE-DCE Flow Control options also applies to DCE-DTE (modem to
terminal) flow control options, except that the CTS, Clear to Send,
signal is used to control DTE-DCE data flow instead of RTS.
Flyback Buffer options are available Hayes, V.25 bis, Dumb, Leased line
modes (except V.33). The Flyback Buffer option is effective only when MNP
error correction is active. Flyback buffering is used for specific applications
such as printers, teletypes, etc.
• ENABLE — If MNP is buffering data, a five-character delay is inserted
after the following characters are sent to the terminal: HT (09), LF (0A),
VT (0B), FF (0C), and CR (0D).
• DISABLE — Flyback buffering will not occur.