Kinco FD3&CD3 User Manual
Chapter 10 RS232 communication
The CD3 motor controller can be controlled, configured or monitored via a RS232 communication interface (X3) using
the following interface and protocol description.
10.1 RS232 wiring
If the motor controller should be controlled by a programmable logic controller (PLC) or other controllers via the a
RS485 communication interface, a RS485 to RS232 converter has to be used.
10.1.1 Point to point connection
Figure 10-1: Communication wiring between PC (DSub 9-pin) and CD423 controller
10.1.2 Multi-point connection
The communication protocol provides network operation with a host computer operating as a master and several CD3
controllers working as communication slaves （RS232_Loop_Enable(d5.15) must be set to1, save and reboot the
controller after setting). In that case the RS232 cabling must have a loop structure as follows:
Figure 10-2: Communication wiring between PC (DSub 9-pin) and multiple CD423 controllers
10.2 Transport protocol
RS232 communication of the CD3 motor controller strictly follows master / slave protocol. The host computer send
data to the CD3 controller. The controller checks the data regarding a checksum and the correct ID number,
processes the data and returns an answer. Default communication settings for the CD423 motor controller are as
follows:
Baud rate = 38,400 bps
Data bits = 8
Stop bits = 1
No parity check
The baud rate can be changed in RS232 BaudRate(d5.02). After changing the value it’s necessary to save the setting
and reboot the system.
The controller’s ID can be changed in Node ID(d5.02).
The transport protocol uses a telegram with a fixed length of 10 bytes.
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