Functions
MLR 3G 2.0
10.8.2
Configuring the Serial Ethernet Gateway
The serial Ethernet gateway of the MLR 3G 2.0 allows a comprehensive configuration of
the serial interface and the packing of the data arriving there into TCP packets. It is also
possible to use the Telnet protocol. RFC 2217 is also supported with this, which allows to
modify the serial interface parameters during the operation via a Telnet connection.
Configuration with the web interface
In order to configure the
serial interface speed
, select in the menu" Serial
Ethernet" on the page "Configuration" the speed in the drop-down list "Speed
(in Bit/s)".
Configure the
data format of the serial interface
in the drop-down lists "Data
bits / Parity bits / Stop bits".
Select the
data flow control
(Hardware, i.e. RTS/CTS or Software i.e.
XON/XOFF) in the drop-down list "Flow control". If the connected serial device
does not support the respective data flow control, you must not use this.
In order to use the
control lines
DCD and DTR, check the checkbox "Use mo-
dem control lines".
In order to
reset the control lines after the connection is terminated
, check the
checkbox "Reset modem control lines after connection termination".
In order to specify the
maximum block size
, from which the serially received
data are packed to a TCP packet and sent when reached, enter the value into
the field "Maximum block size".
In order to specify the
maximum time until packing a TCP packet
, enter the
time into the field "Aggregation timeout" in milliseconds. If this time has ex-
pired, the serially received data will be packed to a TCP packet and sent, even
if the maximum block size has not yet been reached. This timer will only be
restated if the RS232 input buffer is empty and the first character is received.
The subsequent characters do not reset the timer.
In order to
close the serial Internet connection automatically
,
if no data is
transmitted
any more, enter a timeout value in seconds into the field "Idle
time". If no data transfer takes place as long as specified here, the connection
will be closed. To ensure that the connection is never closed, set the value to
"0". The value "0" is the default setting.
In order to enable
sending keep alive packets
, enter the sending interval of
the packets in seconds into the field "Keep alive interval". This function is dis-
abled by entering "0". If the serial Ethernet gateway receives no reply to a keep
alive packet for three consecutive times, the connection will be considered as
interrupted and the serial Ethernet gateway terminates the connection.
In order to
use the Telnet protocol
, check the checkbox "Use Telnet protocol".
In this case, the serial Ethernet gateway filters all Telnet commands from the
incoming TCP data and replies them. Additionally, the serial and the TCP data
stream are adjusted to transmit Telent control characters error free.
Save your settings
by clicking "OK".
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