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EM-C061 Computer User Manual
17
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
1
2
3
4
5
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.