Ethernet Adaptor 01-103
Sparr Electronics Ltd., Bangalore
31
______________________________________________________________________
L
LAN
A LAN (Local Area Network) is a computer network characterized by the fact that a
message sent from one LAN computer to another does not pass through a router. Note
that most LANs are located within a relatively small geographical area, such as a building
or campus.
______________________________________________________________________
M
MAC address
On a local area network (LAN) or other network, the MAC (Media Access Control)
address is your computer's unique hardware number. (On an Ethernet LAN, it's the same
as your Ethernet address.) When you're connected to the Internet from your computer (or
host as the Internet protocol thinks of it), a correspondence table relates your IP address to
your computer's physical (MAC) address on the LAN.
Modbus
Modbus is an application layer messaging protocol, positioned at level 7 of the OSI
model that provides client/server communication between devices connected on different
types of buses or networks. Modbus is a request/reply protocol and offers services
specified by function codes. Modbus function codes are elements of Modbus
request/reply PDUs (Protocol Data Unit).
______________________________________________________________________
N
Netmask
A netmask is a 32-bit number that is used to determine the network scope of a computer‟s
IP address. The most commonly used netmasks are 255.0.0.0 for Class A networks,
255.255.0.0 for Class B networks, and 255.255.255.0 belongs to a class C network, in
which all computers on the network have IP address of the form 192.168.254.xxx.
______________________________________________________________________
P
PPP
The Point-to-Point Protocol is designed for simple links which transport packets between
two peers. These links provide full-duplex simultaneous bi-directional operation, and are
assumed to deliver packets in order. It is intended that PPP provide a common solution
for easy connection of a wide variety of hosts, bridges and routers.
______________________________________________________________________
R
