A&D AD-4408A Instruction Manual download pdf (Page 11)

4. Modbus Memory

4.1. Memory Map

Modbus uses reference numbers and addresses to control the AD-4408A or to read data.

The AD-4408A uses Holding Registers and Input Registers.

Data types and reference numbers are as shown below.

Table 4 Data types

Data type

Reference

No.

Description

Output Coil 0

Read and write bit data

Corresponds to the input of the control I/O.

Not used for the AD-4408A.

Input Status 1

Read only bit data

Corresponds to the output of the control I/O.

Not used for the AD-4408A.

Input Register 3

Read only Word data

Used to read weight values and command responses.

Holding Register 4

Read and write Word data

Used to send commands.

NOTE: Do not access the memory area that the AD-4408A is not using.

Table 5 Holding Register memory map

Holding Register (Read and write Word data Reference No. 4)

15 14 12 13 11 10 9 78653 42 1 0

Command bits

First word

of Holding Register

Bit

Zero

Clear the zero value

Tare

Clear the tare value

Hold*

Net displa

Gross display

Manual print command

*Hold at the rising edge, release at the falling edge

Bits 9-15 are

internally reserved.

Error rese

1 2 ... 6 7 8 9 10 11 12 13 14 15 16 ... 21 22

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A&D AD-4408A Instruction Manual Page 11

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