Modbus RTU/ASCII Default Registers

Name

Coils

Base address

1

Data Type

Single Bit

High Register

10000

Low Register

1

Max Per Request

2000

Multi-write Code

15

Read Code

1

String Type Length

1

Write Code

5

Read-only

False

Perform single register writes

False

Always use multi-write function code

False

Subtract 1 from register address

False

High/low byte order

True

High/low word order

True

High/low dword order

True

Name

Inputs

Base address

10001

0001Data Type

Single Bit

High Register

30000

Low Register

10001

Max Per Request

2000

Multi-write Code

0

Read Code

2

String Type Length

1

Write Code

0

Read-only

True

Perform single register writes

False

Always use multi-write function code

False

Subtract 1 from register address

False

High/low byte order

True

High/low word order

True

High/low dword order

True

Name

Input Registers

Base address

30001

Data Type

16-bit integer

High Register

40000

Low Register

30001

Max Per Request

125

Multi-write Code

0

Read Code

4

String Type Length

1

Write Code

0

Read-only

True

Perform single register writes

False

Always use multi-write function code

False

Subtract 1 from register address

False

High/low byte order

True

High/low word order

True

High/low dword order

True

Name

Holding Registers

Base address

40001

Data Type

16-bit integer

High Register

49999

Low Register

40001

Max Per Request

125

Multi-write Code

16

Read Code

3

String Type Length

1

Write Code

6

Read-only

False

Perform single register writes

False

Always use multi-write function code

False

Subtract 1 from register address

False

High/low byte order

True

High/low word order

True

High/low dword order

True