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LX505/LX505SR QUICK INSTALLATION GUIDE
14
5.5.3 RS485 Communication Connection for Multiple Units
An RS485/RS232 converter is needed for RS485 communication between LX505/LX505SR and a host PC.
Please follow the instructions below.
(Figure: RS485 Communication Connection for Multiple Units)
First, connect RS485 port of all LX505/LX505SRs in parallel. (Maximum of 32 LX505/LX505SR)
- Connect RS485-RTX (+) (Yellow wire) of one LX505/LX505SR to RS485-RTX (+) (Yellow wire) of another
LX505/LX505SR.
- Connect RS485-RTX (-) (Gray wire) of one LX505/LX505SR to RS485-RTX (-) (Gray wire) of another
LX505/LX505SR.
- Set a unique Communication Address of each LX505/LX505SR.
Second, connect RS485 port of the first LX505/LX505SR to the RS485/RS232 converter.
- Connect RS485-RTX (+) (Yellow wire) of the LX505/LX505SR to RS485-A port of the converter.
- Connect RS485-RTX (-) (Gray wire) of the LX505/LX505SR to RS485-B port of the converter.
- Plug the 9-pin connector of the converter into the COM port of the host PC.
- Install and run the LX505/LX505ST application software (STARWATCH TIME PRO, LX ACCESS PRO II,
STARWATCH STANDARD).
When you connect RS232/RS485 Converter with LX505/LX505SR, connect Termination Register to both of
the 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 Register as the figure above. But, don‟t use Termination Resistor for
short-distance communication wire. If you use it in short-distance, it could cause communication errors.
RS485/RS232
Converter
Host PC
RS232
RS485
Max. 1200m
Gray
Yellow
Termination
Resistor
Termination
Resister
Last LX505/LX505R
First LX505/LX505SR
Caution