Datasheet

5. Configuration Software HSComm 25
5.3.2 Handshake
The handshake controls the data flow at the serial interface while the data rate is too
high at the moment. Software handshake controls the data flow with the control
characters (XON/XOFF) via the data lines. Hardware handshake uses the separate control
lines RTS/CTS of the serial interface.
Without handshake, overflowing data is ignored.
Attention! Handshake must be deactivated when the INSYS GSM small is operated
with a device that does not support the according handshake.
5.3.3 Responses
The response format of the GSM small after an AT command or a system message
(CONNECT, NO CARRIER, OK, etc.) can be set as text or numerical code; it can also
be switched off, if necessary.
5.3.4 DTR Behavior
The control line DTR of the serial interface indicates whether a device (configuration PC,
control) is connected with the INSYS GSM small and is active. The setting controls the
behavior when the DTR signal is missing, e.g. when the terminal device (PC, control) is
disconnected.
Reaction to DTR deactivation
When the DTR signal changes from 1 to 0, it can be set whether an existing connection is
cleared, the GSM small switches into command mode, or no DTR behavior takes place.
Version 1.00 / 09.04