Flintec DAD 141.1 Modbus Communication - Manual (Page 2)

DAD 141.1 Technical Manual Modbus Communication, Rev. 2.3 - Juni 2014 Page 2
1. How to use Modbus in DAD 141.1
1.1. Implemented functions for Modbus RTU and Modbus TCP.
 0x03 Read holding registers: Used for reading 16 or 32bit values.
 0x04 Read input registers: Same as above.
 0x06 Write single register: Used for writing 16bit values.
 0x10 Write multiple registers: Used for writing 32bit values.
1.2. Modbus RTU
 The baudrate must be set in menu 8.1.
 In multidrop or 2 wire applications the user must select "485" in menu 8.2 or "422" for
point to point 4 wire applications.
 A Modbus address between 1 and 247 must be set in menu 8.3.
 The parity used in the actual Modbus network must be selected in menu 8.7
(select no or o = odd or e = even).
 The Modbus RTU mode must be selected in menu 8.8 (select RTU).
1.3. Modbus Protocols
1.3.1. Modbus RTU via Serial Port
 binary data protocol
1.3.2. Modbus TCP via Ethernet Port:
 binary data protocol, embedded in TCP/IP packages
 Modbus TCP port: 502
 IP address is 192.168.0.100 (factory default)
1.4. Modbus Index Tables
See the following pages.