Chatsworth-products Remote Infrastructure Management System Protocol C Manuel d'utilisateur télécharger pdf (Page 53)

RIM-Protocol Converter User Guide - Version 1.0

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Table 4.2 Read Output Registers Packet Structure

Table 4.3 Output Registers

4.3 RTU Framing

The example below shows a typical Query/Response from an Protocol Converter.

Table 4.4 Response Sample

Slave address 2 responds to Function Code 4 with six bytes of hexadecimal data and ends with CRC16 checksum.

40001 = 0000 (hex)

40002 = 0000 (hex)

40003 = 0001 (hex)

Code Name Description Units Range

40001 Integer Output Register for Integer data 16 0-65535

42001

Float Output

* two registers need

Read Registers Request Packet Read Registers Response Packet

Slave Address (1 byte) Slave Address (1 byte)

03 (Function code) (1 byte) 03 (Function code) (1 byte)

Start Register (2 bytes) Byte count (1 byte)

# of registers to read (2 bytes) First register (2 bytes)

CRC Checksum (2 bytes) Second register (2 bytes)

…

CRC Checksum (2 bytes)

Slave

Address

Function

Code

Count Bytes

of Data

Data

Msb Lsb

Data

Msb Lsb

Data

Msb Lsb

CRC 16

“Lsb”

CRC 16

“Msb”

02 04 06 00 00 00 00 00 01 B5 A3

1 2 ... 48 49 50 51 52 53 54 55 56 57 58 ... 67 68

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Chatsworth-products Remote Infrastructure Management System Protocol C Manuel d'utilisateur Page 53