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Industrial Electronic Devices

The Bytes that composed the respons are these:

The "Status of operation" (Byte Number 1) can have these values:

0xFF: Ok;

0xFE: Different from Write;

0xFC: Writing but function different from 5,6,15,16;

0xFB: The slave interrogated hasn't replied in the TimeOut time;

0xFA: The reply CRC is wrong;

0xF9: Returned function is different from the one requested;

0xF7: Number of byte less than 9;

0xF6: Number of data to wrote is different from 1 or the frame length is wrong if the function is 5,6;

0xF5: Number of data to wrote is less than 1 or the frame length is wrong if the function is 15,16;

0x03: Illegal data value, the value referenced in the data field is not allowable in the addressed slave location;

0x02: Illegal data address, the address referenced in the data field is not an allowable address for the addressed slave device;

0x01: Illegal function, the message function received is not an allowable action for the addressed slave.

Examples:

1) We want to write two points with the following features:

Type of Data: Holding Register; Device Address: 5; Start Address: 0x0115; Number of Point: 2; Data 1: 0x1122; Data 2: 0x3344.

So the string of hexadecimal numbers is:

REQ:[02][10][05][01][15][00][02][11][22][33][44]

RES:[FF]

2) We want to set to 1 the Coil Status at address 0x115:

Type of Data: Coil Status; Device Address: 5; Start Address: 0x0115; Number of Point: 1; Data 1: 0xFF00.

So the string of hexadecimal numbers is:

REQ:[02][05][05][01][15][00][01][FF][00]

RES:[FF]

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Byte Number

Description

Status of operation

User Manual Modbus Master / Ethernet

Document code: MN67506_ENG

Revision 1.012

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