DKM-0208 User Manual V-1.0
(26.10.2015)
-10-
The unit has serial communication port that can be integrated to automation systems.
Serial port is a standart RS-485 MODBUS-RTU isolated from supply input and
measuring terminals. Therefore, the unit survives under harsh industrial conditions
without any damage.
The MODBUS properties of the unit are:
-Data transfer mode: RTU
-Serial data: 9600 and 19200 bps, 8 bit, no parity, 1 bit stop
-The unit replies within 4.3ms when it receives a message.
Each register consists of 2 bytes(16 bits). Larger data structures will contain multiple
registers.
For further details of Modbus Protocol, “
Modicon Modbus Prot
ocol Reference Guide”
can be rewieved. The guide can be downloaded from
www.modbus.org/docs/PI_MBUS_300.pdf
Supported Function:
-
Function 3 (Read multiple registers)
- Function 6 (Write single register)
- Function 16 (Write multiple registers)
Error Codes:
There are only 3 error codes are being used:
01: Invalid function code
02: Invalid adress
10: Read protection (try to write Read-Only memory)
Data Types:
Each register consists of 16 bits (2 bytes)
If the data type is byte, only low byte is valid. Ignore high byte.
A larger data structure(more than 16bit) will contain multiple registers.
Least significant register comes first.
Baudrate Options:
4th jumper determines Modbus Baudrate.
BaudRate
Value
9600
1
19200
0
5. MODBUS COMMUNICATION
5.1 INTRODUCTION
