CIRCUTOR ReadWatt Series - Manual (Page 15)

4�3�3�- WRITE COMMANDS
ReadWatt supports the integer type write functions: 0x10.
The unit's MODBUS variables are specified in Table 4 .
Example: Changing the MODBUS address of peripheral 01 to the address 0x000A .
We will send the following MODBUS frame:
Address
Func-
tion
Initial log Log no� No� bytes Data CRC
01 10 0008 0001 02 000A CRC
The unit will respond to us with the next frame:
Address
Func-
tion
Initial log Log 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 4: 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 -
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
No. of input impulses per output
impulse
0x0108 16 bits Read/Write 10
Ratio between input impulses and
kWh (kvarh)
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 log 0x0600 64 bits Read -
kWh (kvarh) log 0x0604 64 bits Read -
15 Instruction Manual
ReadWatt