Datasheet

INSYS ETHERNET 5.X AT Command Reference
Nov-06 55
AT&K<n> Data flow control at the RS232 (handshake)
AT&K0 Switches the data flow control off
AT&K3 Switches the hardware data flow control (RTS/CTS) on
(default)
AT&K4 Switches the software data flow control (Xon/Xoff) on.
AT&K8 Activates the controlled half duplex operation on the serial
interface for RS485
In this mode, the CTS signal is deactivated (high), while the
device sends data at the serial interface. Thus, the CTS sig-
nal can be used as driver release signal for a RS485 driver.
Controlling of the data direction for RS485 takes place via
the CTS signal. Polarity setting via AT&R<n>.
AT#KEEP=<n> TCP/IP Keep Alive
This timer enables the monitoring of an existing TCP/IP connection when no
data is transferred. When 5 consecutive monitoring packets are not an-
swered, the connection is terminated and re-established, if necessary (in
leased line mode, see AT&L).
AT#KEEP=1..255 The time between monitoring packets in units of 10
seconds
AT#KEEP=0 No monitoring packets (default)
AT&L<n>
Automatic connection setup (leased line)
If no connection to the defined remote terminal exists, an automatic attempt
to establish a connection is performed every 20 seconds. The remote termi-
nal is set with the command AT&Z0.
AT&L0 Deactivates the automatic connection setup
AT&L1 Activates the automatic connection setup
Note:
AT&L1 must only be set at the devices connected to the leased line. The other
device should be configured to automatic connection acceptance with
ATS0=1. For the stability of the connection it is also advisable to activate
Keep alive (AT#KEEP) on both sides.
AT#MSS=<n>
Set maximum segment size
A maximum TCP segment size can be set using the command AT#MSS. This
setting is only required under special circumstances, if the transmission is
done via a router which doesn't support the maximum standard setting for
the segment size of 1460 bytes, or for the timing optimization of application
protocols resting on it (see Chapter IP block formation).
AT#MSS=<n> Maximum TCP segment size n=1...1460
default = 1460