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very small delays for single characters while trying to keep the packet count low. The
alternate packing algorithm minimizes the packet count on the network, and is especially
useful for applications in routed Wide Area Networks. Various parameters can be set in
this mode to economize the serial data stream.
3.2. Channel Identification
The EAD 02 has one IP Address, which is programmable. The port number selects the
specific channel, which must be unique.
3.3. IP Address
Every device connected to the TCP/IP network must have a unique IP address. This IP
address is used to reference the specific device, for example to build a connection to a
serial port. See Appendix B for a complete description of IP Addressing.
3.4. Port Number
Every TCP connection and every UDP datagram is defined by the two peer IP addresses,
which are source and destination port number. These port numbers are necessary to
address different applications or channels on a network host. The port number can be
compared to an extension on a PBX system.
A Telnet application (login to a host with an ASCII terminal) is commonly assigned TCP
port number 23. More than one Telnet connection can be established to one host to the
Telnet port; however, the other peer IP address/port number combination must be
different. In the EAD 02, a different port number for each channel must be configured.
The EAD 02 uses this port number as the source port in outgoing messages and receives
connections or UDP datagrams, which are addressed to this number. Port 9999 (decimal)
is used for remote configuration.
4. Configuration
The EAD 02 can be configured by various remote or local methods. Either use an ASCII
terminal or terminal emulation to locally access the first serial port or use a Telnet
connection to configure the unit over the network. The EAD 02 configuration is stored in
nonvolatile memory and is retained without AC power. The configuration can be changed
any time. The EAD 02 performs a reset after the configuration has been changed and
stored.
4.1. Network Configuration
To configure over the network, a Telnet connection to port 9999 must be established.
