AMD CS5535 User Manual download pdf (Page 27)

21 Appendix A

Terminator Resistors Setup for RS-485

The terminal resistors for impedance matching on the UNO-2059E are

not installed in the factory.

Users can install the resistors with the appropriate resistances according

to the UNO-2059E application. Each terminal resistor corresponds to a

different channels for DATA+, DATA- lines. Usually, these resistors are

needed for both ends of the communication wires and the value of the

resistors should match the characteristic impedance of the wires used

(approximately 120 W or 300 W). The TR1 and TR2 shown on Figure A-

3 are prepared for COM1 and COM2 termination resistors respectively.

Figure A.3: COM Port Terminator Resistor Locations

An example of the installation of COM1 is as follows:

Figure A.4: Terminator Resistor Installation

TR1

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AMD CS5535 User Manual Page 27