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4.3
Ethernet interfaces
You can program and commission the CX8180 Embedded PC via the X001 Ethernet interface. The Ethernet
interface achieves speeds of 10 / 100 Mbit/s.
Fig. 3: Ethernet interface X001.
The LEDs on the left of the interface indicate the connection status. The upper LED (LINK/ACT) indicates
whether the interface is connected to a network. If this is the case, the LED lights up green. The LED flashes
when data transfer on the interface is in progress.
The lower LED (SPEED) indicates the connection speed. The LED is not lit if the speed is 10 Mbit/s. At
100 Mbit/s the LED lights up orange.
Table 4: Ethernet interface X001, pin assignment.
PIN
1
2
3
4
5
6
7
8
Transmission standards
10Base5
The transmission medium for 10Base5 consists of a thick coaxial cable ("yellow cable") with a max. data
transfer rate of 10 Mbaud arranged in a line topology with branches (drops) each of which is connected to
one network device. Because all the devices are in this case connected to a common transmission medium,
it is inevitable that collisions occur often in 10Base5.
10Base2
10Base2 (Cheaper net) is a further development of 10Base5, and has the advantage that the coaxial cable is
cheaper and, being more flexible, is easier to lay. It is possible for several devices to be connected to one
10Base2 cable. It is frequent for branches from a 10Base5 backbone to be implemented in 10Base2.
10BaseT
Describes a twisted pair cable for 10 Mbaud. The network here is constructed as a star. It is no longer the
case that every device is attached to the same medium. This means that a broken cable no longer results in
failure of the entire network. The use of switches as star couplers enables collisions to be reduced. Using
full-duplex connections they can even be entirely avoided.
CX8180
Signal
TD +
TD -
RD +
connected
RD -
connected
Version: 1.5
Product overview
Description
Transmit +
Transmit -
Receive +
reserved
Receive -
reserved
15
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