TCP/IP Overview
The CTI 2572 module uses TCP/IP (Transmission Control Protocol/Internet Protocol) to transport
messages between the module and other nodes on the network. TCP/IP is a suite of protocols that
provide routing and delivery services for messages between application programs running on
different processors (called hosts in TCP/IP terminology). You may select between connectionless
(packet based) or connection-oriented (stream based) delivery services.

TCP/IP uses a standard structure known as a socket, for the application program interface. The de
facto socket standard is the Berkeley Socket, named for the University of California at Berkeley, who
originally distributed TCP/IP. Originally, the Berkeley Sockets were used with only the Unix
operating system. Today, Microsoft Windows includes TCP/IP support using the Winsock standard, a
derivative of the Berkley Socket standard.
Summary
The TCP/IP protocol is used to send and receive messages via the network. It will function over the
local Ethernet network or over Wide Area Networks. TCP/IP supports both connectionless (UDP) and
connection oriented (TCP) services. UDP is usually sufficient for most applications because the
higher-level application protocol (CAMP) incorporates an acknowledgment to commands. TCP/IP
network software for an IBM compatible personal computer is readily available from a wide range of
sources. For a complete discussion of the TCP/IP protocol, see Internetworking with TCP/IP by
Douglas Comer (1991. Prentice Hall) or other commonly available reference material.
Getting Started
If you are not familiar with the 2500P-ECC1 Communications Coprocessor module, you should read the
remainder of this chapter and CHAPTER 2. which describes the communications protocols supported by the
ECC1 module.
CTI 2595 - 16-point TTL/Word Output Module
CTI 2596-8 - 8-point 11-125 VDC Output Module
CTI 2597-8/16/32-point 11-125 VDC Output Module
CTI 2598-8 - 8-point 11-240 VAC Output Module
CTI 2599-8/16/32-point 11-240 VAC Output Module
CTI 2530-8-point Form-C Relay Output Module
CTI 2532-16-point Form-A Relay Output Module
CTI 2534-8-point Form-C Relay Output Module
CTI 2501 - 8in/4Out Analog Module
CTI 2550-A - 8-Channel Isolated Analog Input Module
CTI 2555-A - 16-Channel Analog Input Module
CTI 2558 - 8-Channel Analog Input Module
CTI 2560-A - 8-Channel Isolated Analog Output Module
CTI 2551-A - 8-Channel Isolated Thermocouple Input Module
CTI 2552-A - 8-Channel Isolated RTD Input Module
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