Rs485 Termination; What Is Rs485 Termination; When Is Termination Used - Adaptive Micro Systems AlphaEclipse 3600 A Series Installation Instructions Manual

September 28, 2004

RS485 termination

What is RS485 termination?

When signs are connected together, it is necessary to terminate each end of the network. This is necessary to
make sure that the signs communicate with each other.
If signs are not correctly terminated, messages could be displayed improperly.

When is termination used?

RULE: Terminate the first and last sign in a network:
RULE: If a Converter Box III is used, treat the converter box as if it were a sign:
Converter Box III + ONE SIGN
Converter Box III + TWO SIGNS
Converter Box III + THREE SIGNS
Converter Box III + FOUR SIGNS
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AlphaEclipse 3600 Series A Sign Installation Instructions (9711-8001C)
Terminated
ONE SIGN
Terminated
TWO SIGNS
Terminated
THREE SIGNS
Terminated
FOUR SIGNS
Terminated Terminated
Terminated Not Terminated
Terminated Not Terminated
Terminated Not Terminated
Terminated
Not Terminated Terminated
Not Terminated Not Terminated
To terminate a Converter Box III, set
the switch on the back of the unit.
Terminated
Not Terminated Terminated
Not Terminated Not Terminated
Terminated
Terminated
Appendix