E820-AIO Data Acquisition Module User Manual

Introduction

This manual provides detailed information for the E820-AIO Data Acquisition Module. It covers features, electrical specifications, pin definitions, connection methods, ModBus registers, and instruction formats.

This manual may be modified based on product upgrades. Please refer to the latest version. All rights to interpret and modify this manual belong to Chengdu Ebyte Electronic Technology Co., Ltd.

Version History

Product Overview

The E820-AIO is an analog signal collection product designed by Ebyte. It utilizes an RS485 communication network to transmit analog signals from scattered field data points via AD transformation to a master or control remote site via a PC. Featuring a built-in watchdog timer (0.2s reset), the system is designed to prevent halts. The E820-AIO analog acquisition module supports measurement data collection, device switch status collection, and is primarily used for data collection, control, and device display in various measurement and control terminals, making it suitable for automation and information systems across diverse industries.

Features

• Wide working temperature range: -40°C to +65°C, suitable for harsh working environments.
• Non-directional input power design: Prevents misconnection and over-voltage damage, enhancing reliability.
• Modbus protocol: Supports Q&A communication, offering ease of use, cost-effective hardware, and broad compatibility.
• High acquisition accuracy: Achieves 0.1%FS.
• All aluminum alloy shell: Provides good EMS performance, a compact size, easy installation, and effective heat dissipation.
• Watchdog timer: Enables precise time layout. In case of any exception, the module restarts in 0.2s and continues with previous parameters.

Electrical Parameters

1.1 E820-DTU (AI-485-4-5)

1.2 E820-DTU (II-485-4-20)

1.3 Series Products

FAQ

Notice

Function Description

2.1 Pin Definition

2.1.1 E820-DTU (AI-485-4-5)

2.1.2 E820-DTU (II-485-4-20)

2.2 Connection Method

2.2.1 RS485 Connection Method

Register Configuration Table

3.1 ModBus Address Table

Note: Addresses 40001-40012, 40017-40028, 40042-40049 are not used in this device.

3.2 Baud Rate Code Table

3.3 Parity Bit Code Table

Instruction Format

4.1 Input "03" to Read the Command of Single Register

Users input "03" to read the command of register value. Below is the command to read the value of baud rate:

Send the above command via the serial assistant to the module, then the following value will be returned:

The value of 40034 is 3, which means the baud rate is 9600. See more details in the baud rate value table.

Note: With the known baud rate, to use FF monitoring address can read the unremembered register value. Such as, send FF 03 00 21 00 01 c1de to read the address of the device. CRC parity check code can be calculated by CRC16 system. The assistant software can be downloaded from the official website.

4.2 Input "03" to Read the Command of Multiple Registers

Users input "03" to read the command of register value. Below is the command to read the addresses of 40034 to 40036:

Send the above command via the serial assistant to the module, then the following value will be returned:

The value of 40034 is 3, which means the baud rate is 9600. See more details in the baud rate value table. The value of 40035 is 0, the parity bit of the device is no parity. See more details in parity check code table. The value of 40036 is 0.

4.3 Input "06" to Write the Command of Register

Input "06" to write a single command. Below is the command to change the baud rate to 19200:

The write value of 40034 is 4, the corresponding baud rate is 19200. See more details in the baud rate table.

If the revision is successful, the module will return 01 06 00 21 00 04 d803.

4.4 Factory Default Value

Software Instructions

5.1. MoBusCRC16 Calculator

Ebyte will provide the MoBusCRC16 calculator for your convenience, which will automatically add the CRC16 parity check code after the input data. Please pay attention to the format; if it's less than f, then should add 0 in the front, such as 01, 06, and each digit should be followed by a blank.

5.2. E820 Testing Software

In the upper monitor software, the start address of the register is set in the address column, and the length should be from the start address to the end address. For example, if the address is 1, it means to read from 40001. The length of 49 should read 49 registers from 40001-40049. Analog quantity input (1,2,3,4) should be the real current value input by the current channel. Channel (1,2,3,4) conversion value shows that the analog signal of the current channel is converted to the original value after collection.

Important Statement

1. CDEBYTE reserves the right of final interpretation and modification of all the contents in this manual.
2. As the hardware and software products are continuously improving, this manual may be subject to change without notice; please refer to the latest version.
3. Users who use this product need to pay attention to the product dynamics on the official website so that users can get the latest information of this product in time.

About Us

CDEBYTE after-sales technical support: support@cdebyte.com

For file download and more product information, please visit: www.cdebyte.com/en/

Thank you for using the CDEBYTE products! Any questions or suggestions, please contact: support@cdebyte.com

Company: Chengdu Ebyte Electronic Technology Co., Ltd.

Tel: +86-28-61399028 ext. 812

Fax: 028-64146160

Web: www.cdebyte.com/en/

Address: Innovation Center D347, 4# XI-XIN Road, Chengdu, Sichuan, China