Trane Mobrus RTU TR1 Series, Instruction Manual

13

Standard

Modbus

Functions

The drive’s Modbus RTU interface supports the following standard Modbus RTU functions.

01

HEX

Read Coil Status

03

 HEX

Read Holding Registers

(Example 3)

(Example 10 & 11)

05

 HEX

Force Single Coil

06

 HEX

Preset Single Register

(Example 6)

(Example 7, 8 & 11)

0F

 HEX

Force Multiple Coils

10

 HEX

Preset Multiple Registers

(Examples 1, 2, 4 & 5)

(Example 9 & 12)

The examples on the following pages demonstrate how to use these functions to control and
monitor drive operation. All communication examples assume that the drive’s Modbus RTU
address is 1.

Example 1

Start the Drive and Give It a Reference via Modbus RTU

Setting the Control Word and Serial Reference Coils
Modbus Function 0F

HEX

 – Force Multiple Coils

Example 2Give the Drive a Reference via Modbus RTU

Setting the Control Word and Serial Reference Coils
Modbus Function 0F

HEX

 – Force Multiple Coils

Example 3

Read Basic Drive Status Information

Reading the Status Word and Output Frequency/Feedback Coils
Modbus Function 01

HEX

 – Read Coil Status

Example 4

Give the Drive a Ramp to Stop Command

Setting the Control Word Coils
Modbus Function 0F

HEX

 – Force Multiple Coils

Example 5

Give the Drive a Coast to Stop Command

Setting the Control Word Coils
Modbus Function 0F

HEX

 – Force Multiple Coils

Example 6

Set How the Drive Stores Parameter Values

Setting Coil 65
Modbus Function 05

HEX

 – Force Single Coil

Example 7

Write a Parameter Value from a List of Choices

Writing a single register
Modbus Function 06

HEX

 – Preset Single Register

Example 8

Write a 16 Bit Parameter

Writing a single register
Modbus Function 06

HEX

 – Preset Single Register

Example 9

Write a 32 Bit Parameter

Writing two registers
Modbus Function 10

HEX

 – Preset Multiple Registers

Example 10

Read a 32 Bit Parameter

Reading two registers
Modbus Function 03

HEX

 – Read Holding Registers

Example 11

Read an Indexed Parameter and Read an 8 Bit Parameter

Setting the value of register 1 and reading a single register
Modbus Function 06

HEX

 – Preset Single Register

Modbus Function 03

HEX

 – Read Holding Registers

Example 12Write a Text String

Writing multiple registers
Modbus Function 10

HEX

 – Preset Multiple Registers

Example 13

Read a Text String

Reading multiple registers
Modbus Function 03

HEX

 – Read Holding Registers

Communica-

tion

Examples