Lucas Industries EM-C061 Manual de usuario descargar pdf (Pagina 23)

EM-C061 Computer User Manual

5.3 KEYBOARD PORT

The computer supports an AT style 101 Keyboard.

Keyboard Connector

(Rear View)

Pin Signal

1 KeyClk

2 KeyData

3NC

4 GND

5 VCC

5.4 NETWORK COMMUNICATIONS PORT

Ethernet is the most widely used of all LAN protocols. Typical characteristics of the Ethernet

are:

Bandwidth Protocol Frame Size Max. Nodes Max. Network Span

10 MB/Sec CSMA/CD 1514 bytes 1024 2.8 Km

There are 3 basic topologies. Characteristics of each are shown below:

Media Topology Segment Cable Connection

10 BASE-T STAR

(Twisted Pair)

100 Meters 24 AWG, 100 ohm, 8 pin, RJ45

10 BASE-2 BUS

(Multi-Point)

185 Meters RG58, BNC ‘T’

10 BASE-T is most popular because of its low cost and easy installation. Also, UTP’s star topology

allows the rest of the network to function correctly even if a break occurs in a particular segment.

Cable length is limited to 100 m for twisted pair wires.

The EM-C061 can be ordered with 10 BASE-T and 10 BASE-2 connectors. Both connectors are

available when the Ethernet option is ordered.

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Lucas Industries EM-C061 Manual de usuario Pagina 23