Lite-On Technology Corp.
Industrial Automation
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Chapter 8 Communication Mechanism
8.1. RS-485/RS-232 Communication hardware interface
For communication, the servo drive supports two serial communication functions RS-485 and RS-232 to
access and alter the parameter in the servo system. The communication functions RS-485 and RS-232
cannot be used simultaneously. The description is as follows:
Definition of the CN3 interface pin for servo motor:
Fig. 8.1 Definition for the communication Interface CN3 of servo motor
For RS232 communication, use Pin 1 (TX), Pin 2 (RX) and Pin 3(GND) of Interface CN3. For RS485
communication, use Pin 4 (-) and Pin 5 (+) of CN3 Interface.
Note: The definition of RS232TX and RS232RX defined in Interface CN3 is the one for the signal at the
servo drive end. If the servo motor is the slave for communication, dock TX of the master end for
communication to RS232RX at the slave end. Dock RX at the master end to RS232TX at the slave end.
Description for the use of RS232:
1) 15 m is required for the environment with less noise. For the transmission speed above 38400bps, use the
communication line with the length below 3 m to ensure the transmission accuracy.
2) For the definition of the wiring regarding RS232 connector, refer to Fig. 8.1 Definition for the
communication Interface CN3 of servo motor.
Description for the use of RS-485:
1) It is suggested to use the line with the length below 15 m to ensure the transmission accuracy.
2) For the definition of the wiring regarding RS-485 connector, refer to Fig. 8.1 Definition for the
communication Interface CN3 of servo motor.
3) When using RS-485, 32 drives can be connected simultaneously. For connecting more servo
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