Instruction manual

C-Bus By Demand 3
Training Manual 9
1.3 Ethernet Basics
There are two parameters that need to set to program a C ‐Bus Network Interface (CNI), and
theyare:
 • IPAddress
 • SubnetMask

1.3.1 IPAddress

An IP Address is the logical address of a network adapter. The IP Address uniquely identifies
computers,printersandotherEthernetDevicesonanetwork.
InternetProtocolsupportstheideaofindividualaddressingforEthernetDevicesonanetwork.
An IP Address contains four bytes (32 bits), which is enough to address mos
t computers on  a 
network. Each byte of an IP address is known as an octet. Octets are given a value between 0
and255,butvariousru
lesexistforensuringIPaddressesarevalid.

1.3.2 SubnetMask

A Subnet Mask allows the transmission of network traffic between  Ethernet devices to be
segregated based on a network configuration. By organising Ethernet devices into groups,
subnettingcanimprovenetworksecurityandperformanceofthenetwork.
Subnettingismorecommonlyrecognisedasthesubnetmask.ASubnetsharesthesameformat
as an IPad
dress. Each subnet maskcontainsfour bytes (32 bits) and is written using the same
formatasIPAddressing.
Althougha SubnetMaskisconstructedinthe
sameformasa IPAddress,itdoesnotsharethe
same function. A subnet mask accompanies an IP Address, an
d the two parameters work
together.
Asaruleofthumb: 
 • ProgramtheCNI’sSubnetMasktothesameSubnetMaskas
thePC
 • ProgramtheCNI’sIPAddresstoanalmostidenticalIPAddressofthePC.
Thetablebelowshowssomeexamplesoftheruleofthumblistedpreviously.
Ethernet Device Subnet Mask IP Address
PC 1
PC 2
CNI 1
CNI 2
CNI 3
Printer
255.255.255.0
255.255.255.0
255.255.255.0
255.255.255.0
255.255.255.0
255.255.255.0
192.168.170.1
192.168.170.2
192.168.170.3
192.168.170.4
192.168.170.5
192.168.170.6
Table 3: IP Addressing Examples.
This is a very generalised rule of thumb, but is the easiest way to configure network.
Thereareexceptionstothisrule.