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Table 2.9
RS-485 Serial port COM4 ( Outside connector)
1 5
\ooooo/ \o 0 0 Of
6 9
Pin DB9
Signal
2
RXD
3
TXD
5
GND
Notation:
If the output resistance of a transmitter and the input resistance of a receiver
are not equal to the chatacteristic impedance ofthe used line, it produces signal reflections that causes interferences. It is then necessary the "matching", or "termination", ofthe transmission lines.
Parallel termination:
The termination method that gives better performances is the "parallel" one. In case of poit-to-point transmissions, in parallel at the receiver it is necessary insert between terminals A and B a resistance with same value of the line characteristic impedance about 120 Ohm.
(About this argument refer to the JumperJP3 configuration).
Parallel Termination of the Rs 485 serial port ( COM4 )
Table 3.0_COM4 Parallel Termination (JP3)
* Termination Disabled Termination Enabled
* Factory configuration
27
SPPC 12" User Manual
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