B&B Electronics ESP902 - Manual - Manual (Page 12)

Introduction
4 Chapter 1 Manual Documentation Number: ESP901-902_5012m
B&B Electronics Mfg Co Inc – 707 Dayton Rd - PO Box 1040 - Ottawa IL 61350 - Ph 815-433-5100 - Fax 815-433-5104 – www.bb-elec.com
B&B Electronics Ltd – Westlink Commercial Pk – Oranmore, Galway, Ireland – Ph +353 91-792444 – Fax +353 91-792445 – www.bb-europe.com
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
Serial Servers and the LAN.
Two Serial Servers 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.