Product specifications

26 Documentation Number: ESP901-2303 Manual
B&B Electronics Mfg Co Inc – 707 Dayton Rd - PO Box 1040 - Ottawa IL 61350 - Ph 815-433-5100 - Fax [phone]
B&B Electronics Ltd – Westlink Commercial Park – Oranmore, Galway, Ireland – Ph [phone] – Fax [phone]
Paired Mode (Serial Tunneling)
Paired mode is also called serial tunneling. When this type of configuration is selected
additional software will not have to be loaded on a host PC. In fact a PC is not
required to make the connection. Any two dumb serial devices that can communicate
with each other through a serial link will be able to communicate using two ESP901’s
and the LAN.
Two ESP901’s are configured with one setup as a TCP or UDP client and the other to
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 Servers IP address.
Heart Beat
The ESP901 provides a convenient way to establish reliable communications between
two devices. Communication port 5300 is reserved for the Heartbeat Protocol.
Without this feature a device that loses a connection and stops communicating would
not be able to reconnect without personally attending to the problem. 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 5 seconds until communications is established again. The Heart Beat feature is
available to use with the Virtual COM port mode and TCP Direct IP connection. This
is not available when using a UDP application.