Despatch Protocol Plus Modbus Communications Manual do Utilizador descarregar pdf (Página 26)

Chromalox Instruments and Controls

A-51643 Rev. 6 10/06/03 20

5 Function Set Details

This section details the Modbus functions supported in the Protocol

Plus controller.

5.1 Function Set Overview

Table 8 Protocol

Plus Function and Exception Code Set

Function Code

Function Name

Read Outputs

Read Input Discretes

Read Holding Register (Read Multiple Registers)

Read Input Registers

Write Single Register

Diagnostics

Write Multiple Registers

Report Slave ID

Table 9 Protocol

Plus Diagnostic (Function Code 08) Sub-function Set

Sub-function Code

Sub-function Name

Comments

Return Query Data

Loop Back

Restart Communications Options

Reset the slave. Cancels Listen Only

Mode.

Return Diagnostic Register

Contents of slave‘s 16-bit diagnostic

Force Listen Only Mode

Reset by Restart Communications

Option

Clear Counters and Diagnostic Register

Also cleared at power up. Clears only

the counters

Return Bus Communication Error Count

Slave CRC errors only.

Return Bus Exception Error Count

Slave Exception Response count.

Return Slave Message Count

Number of messages addressed to the

slave and successfully processed.

Includes broadcast messages.

1 2 ... 21 22 23 24 25 26 27 28 29 30 31 ... 52 53

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