Subnet Mask; Tcp (Transmission Control Protocol); Tcp/Ip; Udp (User Datagram Protocol) - ICP DAS USA tGW-700 Series User Manual

Tiny modbus/tcp to rtu/ascii gateway

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14. Subnet Mask

The Subnet mask is often simply called the mask. Given its own IP address and its subnet

mask, a host can determine if 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 router.

TCP provides a reliable flow of data between two hosts and is associated with tasks such

as dividing the data passed to it from applications 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.

The Transmission Control Protocol (TCP) and the Internet Protocol (IP) are the standard

network protocols. They are almost always implemented and used together in a formation is

known as TCP/IP. TCP/IP can be used to communicate across any set of interconnected

networks.

UDP provides a much simpler service to the application layer as if just sends packets of

data from one host to the other, but there is no guarantee that the packets will reach the

destination host.

tGW-700 Series User Manual, Version 1.7, Mar 2013

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