Laurel-electronics LTM DPM SERIES ANALOG INPUT, SERIAL DATA OUTPUT Manuel d'utilisateur télécharger pdf (Page 29)

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6.0 SUPPORTED EXCEPTION RESPONSE CODES

Code Name Error Description

---- -------------------- ------------------------------------------------------

01 Illegal Function Illegal Function Code for this Slave. Only hex Function

Codes 03, 04, 05, 08, 10 (dec 16) are allowed.

02 Illegal Data Address Illegal Register Address for this Slave.

03 Illegal Data Value Illegal data value or data length for the Modbus protocol.

04 Slave Device Failure Slave device failure (eg. Transmitter set for external gate).

7.0 MESSAGE FORMATTING

MA = Meter Address DD = Data (Hex) CL = CRC Lo Byte

FC = Function Code WW = Data (On/Off) CH = CRC Hi Byte

RA = Register Address SF = Sub-Function CR = Carriage Return

NR = Number of Registers EC = Error Code LF = Line Feed

NB = Number of bytes LRC = ASCII Checksum

Modbus RTU Format

Byte Number

FC Action

> 3.5

Char

1 2 3 4 5 6 7 8 9 10 11

Request

Response

NoTx

DD*

Request

Response

NoTx

DD*

Request

Response

NoTx

Request

Response

NoTx

Request

Response

NoTx

DD*

CL CH

Exception

Response

NoTx MA

+80

EC CL CH

DD* = (DD DD) times NR (Number of Registers)

1 2 ... 24 25 26 27 28 29 30 31 32 33 34 ... 39 40

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Laurel-electronics LTM DPM SERIES ANALOG INPUT, SERIAL DATA OUTPUT Manuel d'utilisateur Page 29

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