Rs-485 Interface Handling - TechWind SDK-500 User Manual

that operation an average current value will be stored in the controller's non-volatile memory
as the reference values for the door mechanical resistance.
Once all procedures described above are finished, leave the controller's menu by
pressing the [ESC/MENU] button. Again, the initialisation procedure will start automatically
and the door will move to the closed position. You will see "Door closed" information on the
display. The door and the controller are ready for normal operation.

7. RS-485 INTERFACE HANDLING

There is optional RS-485 used for communication with
parameters:
– format: 1 start bit, 8 data bits, 1 or 2 stop bits, no parity control
– baud rate: 19200 bit/sec.,
– protocol: Modbus RTU,
– device address: 0x18 + N (where N means value of "Door number" parameter).
All device parameters are available via RS-485 interface, as HOLDING-type registers. The
registers can be read/write using following functions of Modbus RTU protocol:
– read of registers - function 3h
– write of registers - function 6h or 10h
• Maximum group size for 03h and 10h functions can not exceeds 16 registers (for
single frame).
• The device interprets the broadcast messages, but then do not sends the
answers.
If an error occurs while write or read of single register, then the device sends an error
code according to Modbus RTU specifications:
Error
01 illegal function (only functions 03h, 06h and 10h are available)
02 illegal register address
03 illegal data value (out of permissible range)
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User's manual for elevator door controller SDK-500
SDK-500 controller.
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