User`s guide

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Chapter 7
Serial Ports
This chapter provides information about the type and usage of the two serial
ports on the RUC.
Background
There are two types of serial interfaces. The first type is the type used in PCs,
which is called a DTE interface. The block diagram of this interface is shown
below:
DB9
10
5
4
3
2
1
DTE
Computer End
Ethernet Board
TXD
TX
+ V
+
100 100
470 uF
RX
RXD
RUC
Serial Cable