DK-45 Kullanım Kılavuzu V1.0 (22.09.2016)
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The unit offers the possibility of MODBUS communication through its serial port.
The serial port has 0/+5V logic levels.Using special adapters it is converted to RS-232 or RS-485
standards.
The MODBUS properties of the unit are:
-Data transfer mode: RTU
-Serial data: 9600 bps, 8 bit, no parity, 1 bit stop
-Supported functions:
-Function 3 (Read multiple registers, max 120 registers)
-Function 6 (Write single register)
-Function 16 (Write multiple registers, max 32 registers)
-Answer to a message is sent within 4.3ms after the reception of the querry.
Each register consists of 2 bytes (16 bits). A larger data structure will contain multiple registers.
Detailed description about the MODBUS protocol is found in the document “Modicon Modbus Protocol
Reference Guide”. This document may be downloaded at: www.modbus.org/docs/PI_MBUS_300.pdf
Each device in the same RS-485 serial network must be
assigned a different slave address. Otherwise the Modbus
communications will not be performed.
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