Samsung SSA-R2010 ユーザーズマニュアル

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INSTALLATION AND EXTERNAL CONNECTION
COMMUNICATION LINE CONNECTION
RS-485 Communication Port Connection (Standalone)
A RS-485/RS-232 converter is needed to make RS-485 communications between the product and the host PC. 
Please follow the steps below:
Connect the yellow RS-485-RTX (+) line to the RS485-A port of the converter.
Connect the gray RS-485-RTX (-) line to the RS485-B port of the converter.
Connect the RS-485/RS-232 converter to the serial port (COM port) of the host PC.
Install and launch the application (SAMS).
1.
2.
3.
4.
A B
RS-485/RS-232 
Converter
RS-232
RS-485
Host PC
Max. 1200m
Gray
Yellow