Vaisala Hydromet Data Collection Platform - Manual (Page 270)

User's Guide ______________________________________________________________________
268 _________________________________________________________________ M210933EN-C
Parameters for virtual COM port configuration are presented in Table
49 on page 268 .
Table 49 Virtual COM Port Parameters
Parameter Use Note
Service connection
enabled Accept service connection from this
port. If service connection is required,
there should be at least one
communications interface (both
logical and physical) with
incoming connections enabled.
The option Accept incoming
must also be selected for the
virtual COM port.
Max idle time [s] If no commands are issued through
the open service port during this
time, the port will be closed
automatically. The idle time is configured in
seconds.
Max scrap chars Maximum number of "scrap"
characters without <CR> to accept
before automatically closing the open
service connection. Used to reject interference
caused by, for example, line
disturbance or malfunctioning
devices.
Service connection trigger,
open action, close action Target component and action
identifiers to trigger when service
connection is opened or closed.
Local port number Number of the local TCP port. Used only for incoming (passive)
connections. The local port
number must be unique for each
virtual COM port accepting
incoming connections.
Inactivity timeout Time in seconds for which
connection is kept open with no
traffic.
TCP keepalive TCP keepalive transmission interval
in seconds. Ensures connection status. If
three attempts fail, the connection
will be closed. Generates
"dummy" traffic through an open
connection, thus preventing idle
timeouts that may exist, for
example, in GSM modems. The
connection is closed if four
consecutive transmission
attempts fail.
Enable Telnet protocol Enable support for Telnet escape
sequence decoding and negotiation. Virtual COM port does not provide
full Telnet functionality, but it
provides handling for certain
escape sequences to enable
binary file transfer.