Circutor ReadWatt Series Bedienungsanleitung PDF herunterladen (Seite 15)

4�3�3�- WRITE COMMANDS

ReadWatt supports the integer type write functions: 0x10.

The unit's MODBUS variables are specied 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 -

Instruction Manual

ReadWatt

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