Modbus Read Command - ICP DAS USA I-7530A-MR-FD User Manual

This page is used for configuring "Modbus Read Command" and
"Response CAN Message". The major purpose of the "Modbus Read
Command" is access Modbus slave device via "Modbus Read Coil" or "Modbus
Read Registers" command. And the major purpose of the "Response CAN
Message" is used to response CAN message with I/O data which is read from
Modbus slave device via "Modbus Read Command".

6.3.1.1 Modbus Read Command

The "Modbus Read Command" is divided into several parameters.
Following, we will illustrate how to configure and operate the "Modbus Read
Command".
 Memory Usage:
This field indicates the usage of "Read Memory Space". As section 6.2
description, the total memory size is 2048. The meaning of this field is
"current usage / total size", which unit is byte.
 Enabled Current Command:
This field is used to decide whether the current command is used in
operation mode or not. You can enable or disable this Modbus read
command after you selected a command from the command list.
 Modbus Configuration:
As we know, the Modbus Read Coil/Registers format is as following.
Node Function
ID Code
In order to fit Modbus Read Coil/Registers format, the Modbus
configuration interface is designed as following:
I-7530A-MR-FD Modbus RTU to CAN Converter User's Manual (Version 1.0, 08/2022) ------------- 98
Current Usage
Start Start
Address Address
Total Size
Bit/Word Bit/Word
Count Count
CRC CRC