Introduction
Manual Documentation Number: ESP904-4513m
Chapter 1
3
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B&B Electronics Ltd – Westlink Commercial Park – Oranmore, Galway, Ireland – Ph +353 91-792444 – Fax +353 91-792445 –
www.bb-europe.com
To use this mode, the ESP904 must be set to either TCP/server or
UDP/server with a designated communication port number. The virtual COM
driver is the TCP or UDP client.
Paired Mode
Paired Mode
is also called serial tunneling. In this mode any two serial
devices that can communicate with a serial link will be able to communicate
using two ESP904s and the LAN.
Two ESP904s are connected to a network, one configured as a TCP or UDP
client and the other as a TCP/UDP server. When setting up the server the
remote IP address section must contain the address of the client. This will
allow the client’s IP address to pass the IP address-filtering feature of the
server. Conversely, the Remote IP address of the client must contain the
server’s IP address. Both communication port numbers must be the same.
Heart Beat
The
Heart Beat
protocol connection provides a reliable communications
connection in
Virtual COM Port Mode
or with
Paired Connection Mode
.
This feature restores the connection if communications are temporarily lost at
either end due to loss of power or Ethernet connection.
Without this feature a device that loses a connection and stops
communicating would not be able to reconnect without human intervention.
A TCP data connection can be lost when there is a power failure or
temporary loss of an Ethernet connection on either the client or server. If a
loss occurs the Heart Beat feature will try to reconnect the TCP data
connection every five seconds until communications is established again. The
Heart Beat feature is available for use in
Virtual COM Port
Mode
and
Paired
Connection Mode
. This is not available when using a UDP application.
