Vega VEGACOM 557 Modbus protocol Bedienungsanleitung PDF herunterladen (Seite 39)

VEGACOM 557 Modbus 39

Data transmission with Modbus RTU

Start

Slave

ad-

dress

Func-

tion

code

Address of

1. register bit

Number of

bits

Error

Check

End

Number

of Bytes

Value

range

Meaning

Structure of the enquiry acc. to switching status from Modbus-Master to VEGACOM 557

RTU enquiry telegram acc. to switching conditions (function code 01)

3 ... 4

1 1 2 2 2 3 ... 4

Closed level

1 .. 247

0 ... 65.509 8 ... 2.040 CRC Closed level

0x01 0x01 0x00 0x20 0x00 0x20 0xXX 0xXX

Start

Slave

ad-

dress

Func-

tion-

code

No. of

data

bytes

Error

Check

End

No. of

Bytes

Value

range

Meaning

Structure of the answer VEGACOM 557 to Modbus-Master

RTU answer telegram (function code 01)

3 ... 4

1 byte for 8

3 ... 4

Closed level

1 .. 247

255 1 ... 127 CRC Closed level

0x01 0x01 0x04 0x00 0x0F 0x00 0x0F 0xXX

Data (switching status)

0xXX

Switching status to

AR card #4

Switching status to

AR card #3

1 2 ... 34 35 36 37 38 39 40 41 42 43 44 ... 67 68

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