Delta RMC101 User Manual download pdf (Page 311)

100

101

Ethernet 5.2

Communications 5-61

must go through an IP router. An IP router is a device that sends packets it receives from one

network that are intended for devices on another network to the other network. Here is the

example intranet:

How does 192.168.0.5 send a message to 192.168.1.8? The answer is that it must use a third

parameter called the default gateway. This parameter is the IP address of the router who will take

care of getting the packet to its destination. The rule for most devices is to send packets to

devices with the same network address directly over its network, but to send packets to devices

with a different network address to the default gateway. In the above network, the device at

192.168.0.5 would have a default gateway of 192.168.0.1, and the device at 192.168.1.8 would

have a default gateway of 192.168.1.1.

The default gateway parameter is optional if the device will be on a network that is not connected

to any other networks, or if you have an intranet but do not want to allow the device to

communicate with devices on networks other than its own.

5.2.5.2 RMC Ethernet Protocols

Note: This section is provided for information only and is not required to be understood for using

the RMC Ethernet module successfully. It is not intended to be a complete authority on

networking. For that, we recommend Internetworking with TCP/IP, Volume I: Principles,

Protocols, and Architecture by Douglas E. Comer (Prentice Hall, 1995). It is intended to be a

brief summary of the architecture and a complete list of low-level protocols supported on the

RMC for use by network administrators.

Networking is often viewed conceptually as layers of protocols. Each layer contains a header,

used to fulfill the purpose of that layer, and data. These layers are set up such that each layer

contains the header and data from the next higher layer within its data area, as shown in the

following diagram:

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