Despatch Protocol Plus Modbus Communications Uživatelský manuál stáhnout pdf (Strana 42)

Chromalox Instruments and Controls

A-51643 Rev. 6 10/06/03 36

No. of Registers Lo

$08

CRC

$----

Exception Response Format

Field Name

RTU Example Data

Description

Slave Address

$06

Slave number 6

Function

$81

Read output status with MSB set

Exception Code

$02

Illegal Data Address Exception code

CRC

$----

5.4.1 [01] Illegal Function

The function code received in the query is not an allowable action for the slave.

5.4.2 [02] Illegal Data Address

The data address received in the query is invalid or is not accessible due to the current communication

security setting. For queries involving multiple registers, if any address is invalid in the entire query, the

entire query is rejected, no action is taken, and an exception is generated.

5.4.3 [03] Illegal Data Value

The query data field is invalid or contains an illegal value. This exception can occur when the query data

exceeds the maximum or minimum allowable value for a register or the data does not agree with the

query function. For queries involving multiple registers, if any data is invalid, the entire query is rejected,

no data is written, and an exception is generated.

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Despatch Protocol Plus Modbus Communications Uživatelský manuál Strana 42