Escape Sequence (Return From Data Mode To Command Mode); Serial Port Interface Speed And Flow Control; Serial Port Interface Speed - Telebit T3000 Reference Manual

Escape Sequence
(return from data mode to command mode)
During a data connection, the escape sequence
provides a way to enter command mode without
disconnecting the communications link. An escape
sequence contains three consecutive escape
characters (defined by the S2 register) separated
from other characters by a guard time (specified by
the S 12 register).
The modem switches to command mode only after
you enter an escape sequence with the proper guard
time. The data connection is maintained while the
modem is in command mode.
Note:
The local modem discards any data received from the
remote modem if no link protocol is active.
Serial Port Interface Speed and Flow Control
Most communication problems occurring over the
DTE-DCE interface result from a mismatch in the
interface speed and/or flow control method used by
the DTE and modem. Both devices must agree on the
interface speed and flow control method used.
Otherwise, information may be lost or garbled.
Serial Port Interface Speed
To allow the DTE to communicate with the modem,
the interface speed used by both the DTE and the
modem must match. For maximum data throughput,
set the interface speed between the DTE and the
4-6 Beyond the Basics