W&T 58031, Manual

Page: 105 / 217

105
W&T
Data transfer per TCP/IP sockets
Subject to error and alteration
It must be noted that only one TCP client at a time can be
connected to the serial port of the Com-Server. If there is already
a connection, any attempt from another client is rejected until
this first connection has been properly closed or ended by
means of a reset.
1
This configuration method is intended only for
direct socket access per TCP or UDP. Higher-order
services like TELNET or FTP are not reachable in this way. If the
configurable port number is set to one of the standard values
(e.g. 21 for FTP), the associated service is no longer reachable
and the data area of the TCP or UDP protocol is passed on
transparently to the serial terminal device.
10.1.2 Optional settings
Serial transmission parameters
Baud rate, data bits, parity and handshake procedure must
conform to the connected serial device. For details see section
Configuration of the Serial Port .
Serial receive buffer
The Com-Server has a serial receiving buffer with 4kB capacity.
The
Flush Buffer option specifies whether received serial data
are to be sent to the client or deleted (default setting) after
opening a TCP connection. Details can be found in section
Setup Setup Port x r Setup TCP/IP r System Options
Network delay
In its default setting the Com-Server attempts to sent the
serially arriving data to the network-side application with as little
delay as possible. Particularly when working with host serial
protocols it may be necessary to send the protocol blocks
enclosed in a network packet if possible. The option Network
Delay in
Setup Setup Port x
r
Setup TCP/IP
r
System Options
allows an artificial delay in transmission for this purpose. De-
tails can be found in section
Menu ... Setup TCP/IP
r
System
Options .