Vaisala Hydromet Data Collection Platform - Manual (Page 273)

Chapter 5 __________________________________________ Configuring TCP/IP-Based Telemetry
VAISALA______________________________________________________________________ 271
Configuration for remote host(s) is stored into a parameter set with the
same name as the virtual port, for example, VCOM1. Station-specific
values for these parameters can be set using the paramset commands
described in section
Commands for Parameter Sets on page 293 .
To delete a remote host, select the host from the list and click Delete.
Virtual COM ports buffer outgoing data within the limitations of the
configured transmit buffer. However, according to the buffer flushing
configuration, the output buffer may be cleared when certain
communication events occur.
Service Connection for Virtual COM
Ports
The service connection to a virtual COM port is not a pure ASCII
terminal session, but the information is transferred using a TCP/IP
connection between the terminal software (for example,
HyperTerminal) and the QML logger.
The primary requirement for incoming service connection is that the
QML logger must have a known fixed IP address. If the address is
private, as usually is the case in LAN environments, service access is
possible only from inside the local network to which the QML logger is
connected, not the Internet. If the address is public and there are firewall
configurations allowing the connection to be made, it is possible to
access the QML logger from the Internet.
Point-to-point dial up will establish a network with two peers, where the
requirement of a known fixed IP address is also fulfilled. The known
fixed IP address is required for establishing a service connection.
NOTE In addition to selecting the option Accept Incoming, it is not
necessary to define an interface for incoming connections. Virtual
COM ports can accept a connection from any open interface.
NOTE As the QML logger provides only username/password security, it is
recommended to keep it behind external, strictly restrictive firewall(s).