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LX505/LX505SR QUICK INSTALLATION GUIDE
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5.5.2 RS485 Communication Connection for Standalone Unit
An RS485/RS232 converter is needed to for RS485 communication between the LX505/LX505SR and a host PC.
Please follow the steps below.
(Figure: RS485 Communication Connection for standalone unit)
- Connect RS485-RTX (+) (Yellow wire) of LX505/LX505SR to RS485-A port of the converter.
- Connect RS485-RTX (-) (Gray wire) of LX505/LX505SR to RS485-B port of the converter.
- Plug the 9-pin connector of the converter into the COM1 or COM2 port of the host PC.
- Install then run the LX505/LX505SR application software (STARWATCH TIME PRO, LX ACCESS PRO II,
STARWATCH STANDARD).
When you connect RS232/RS485 converter with LX505/LX505SR, connect Termination Resistor to both of
beginning and end points of the wire as the figure above. If the length of communication wire is too long
in one communication loop, it causes communication problem from the cracked data or decrement. To
prevent it, connect Termination Resistor as the figure above. But, don‟t use Termination Resistor for short-
distance communication wire. If you use Termination Resistor in short-distance, it could cause
communication errors.
RS485
RS232
Host PC
RS485/RS232
Convertor
Max. 1200m
Gray
Yellow
Termination
Resister
Termination
Resistor
Caution
