Micromod MOD: Modcell 2050R MODBUS Communications Manual de usuario descargar pdf (Pagina 42)

IB-23C650M

MODBUS PROTOCOL

Preset Multiple Registers

Master Message Format Bytes

0 1 2 & 3 4 & 5 6 7 & 8

...

x &

x+1

x +2

& x+3

Device

Address

Function

Code

Starting

Number

Registers

Number

of Data

Bytes

Data 1

... Register

Data n

CRC

Slave Response Bytes

0 1 2 & 3 4 & 5 6 & 7

Device Address Function Code Starting Register Number Number of Registers CRC

Coil Data Example

Coil data is packed 1 bit per coil. The low order bit of the first data byte

contains the addressed coil and unused bits are zero filled. For instance, if

coils 22 through 33 are requested, two data bytes will be returned with the coil

data located as follows; (coils 22,24,25,26,29,30,32 and 33 are on).

coil # 29 26 25 24 22 33 32 30

data bytes 1 & 2 10011101 00001101

1 2 ... 37 38 39 40 41 42 43 44 45 46 47 ... 69 70

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Micromod MOD: Modcell 2050R MODBUS Communications Manual de usuario Pagina 42