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Tiny Modbus/TCP to RTU/ASCII Gateway

13. Socket

Each TCP segment contains a source and destination port number that can be used to identify the

sending and receiving application. These two values, along with the source and destination IP

addresses in the IP header, uniquely identify each connection. The combination of an IP address and

a port number is called a socket.

14. Subnet Mask

A Subnet mask, often simply called the “Mask”, is a 32-bit number that masks and IP address, and

divides the IP address into the network address and the host address. Given its own IP address and

its subnet mask, a host can determine whether a TCP/IP packet is destined for a host that is (1) on

its own subnet, or (2) on a different network. If (1), the packet will be delivered directly; otherwise

it, will be delivered via a gateway or a router.

15. TCP (Transmission Control Protocol)

TCP is a set of rules used in combination with the Internet Protocol to send data in the form of

message units between computers over the Internet. TCP provides a reliable flow of data between

two hosts and is associated with tasks such as dividing the data passed to it from an application into

appropriately sized chunks for the network layer below, acknowledging received packets, setting

timeouts to make certain that the other end acknowledges packets that are sent, and so on.

16. TCP/IP

The Transmission Control Protocol (TCP) and the Internet Protocol (IP) is standard network protocols

that are almost always implemented and used together in a formation are known as TCP/IP. TCP/IP

can be used to communicate across any set of interconnected networks.

17. UDP (User Datagram Protocol)

UDP is an internet protocol that provides a much simpler service to the application layer as it only

sends packets of data from one host to another, but there is no guarantee that the packets will

reach the destination host. UDP is suitable for purposes where error checking and correction is

either not necessary or is performed in the application.

ICP DAS USA tGw-735 User Manual

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