Circutor ReadWatt, Instruction Manual

Page: 15 / 24

4�3�3�- WRITE COMMANDS
ReadWatt
supports the integer type write functions:
0x10
.
The device's
MODBUS
variables are specified in
Table 6
.
Example:
Changing the
MODBUS
address of peripheral 01 to the address 0x000A .
We will send the following
MODBUS
frame:
Address Function
Initial
Register
Register no� No� bytes Data CRC
01 10 0008 0001 02 000A CRC
The device will respond to us with the next frame:
Address Function
Initial
Register
Register no� CRC
01 10 0008 0001 CRC
Note:
The values are shown in hexadecimal.
The number of logs to write must be the same as the size of the variable that is being accessed.
It is possible to write several consecutive addresses, if the request meets the correct format.
4�3�4�- MODBUS VARIABLES
Table 6: Readwatt MODBUS variables�
Description
Address
(Hexadecimal)
Size Read/Write Default value
Modbus Address 0x0008 16 bits Read/Write 10
Transmission speed
(Baudrate)
0x010C 16 bits
Read/Write
0: 9600
1: 19200
2: 38400
0: 9600
Serial no. 0x0060 32-bit Read -
firmware version 0x0050 3 x16 bits Read -
Maximum width of impulses in ms 0x0106 16 bits Read/Write 250 ms
Minimum width of impulses in ms 0x0107 16 bits Read/Write 2 ms
Weight count value per output impulse 0x0108 16 bits Read/Write 10
Relationship between optical impulses
and counting register
0x0109 16 bits Read/Write 1000
Transformation ratio
(1)
0x010A 16 bits Read/Write 1
Output impulse width in ms 0x010B 16 bits Read/Write 100 ms
Instantaneous values
Impulse register 0x0600 64 bits Read -
Counting register 0x0604 64 bits Read -
Counting register 0x07D0 64 bits Read/Write -
15
Instruction Manual
ReadWatt