W&T Com-Server++, Manual

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W&T
Expanded services of the Com-Server
Subject to error and alteration
25�2 Reset Com-Server port
Factory default = 9084, 9184, 9 2 84/TCP for ports A, B, C
For special applications this port makes it possible to carry
out a forced reset of the Com-Server port. All current connec-
tions to the serial port are immediately closed, regardless of
whether the respective partner is reachable.
1 The factory default port number under which this
service can be reached is configured and deactivated
in the menu branch SETUP System
r
Setup TCP/IP
r
System
Port List
1 For automatic detection and preventing the TCP
connections from hanging, we recommend using the
keep-alive function of the Com-Server.
Use of the system password
If a system password has been configured (see section „Basic
Configuration of the Com-Server“), this must be null-termi-
nated (=[password] + 0x00) and sent to the Com-Server via
the Control Port within 2s after a connection has been suc-
cessfully opened. If the Com-Server does not receive a correct
or even any password within this time, it sends the message
PASSWD? followed by a null byte (0x00) to the client and clo-
ses the TCP connection.
If no system password is configured, then as the example
shows the Com-Server immediately closes the TCP connection
as soon as it has been established and performs a port reset.
1 When invoking this service, the contents of the serial
in- and output buffer are lost. The port can be opened
by any desired station and should only be used in extreme
cases! No data excepting the password are permitted to be
transported through this connection! The port is opened by a
host and then immediately closed by the Com-Server.