Ebyte E820-AIO Manuel utilisateur

Data Acquisition Module

E820-AIO

User Manual

This manual may be modified based on product upgrade, please refer to the latest version.

All rights to interpret and modify this manual belong to Chengdu Ebyte Electronic Technology Co., Ltd.

Version

Date

Description

Issued by

1.00

2018/01/23

Initial version

huaa

E820-AIO is the analog signal collection product designed by Ebyte. With RS485 communication network, E820-AIO transmits the

analog signal of scattered field data point via AD transformation to master or control remote home site via the PC. Built-in watch dog (0.2s

reset), the system won’t be halted easily. E820-AIO analog acquisition module features measurement data collection, measured data

collection, device switch status collection etc, mainly used for the data collection, controlling and device display of various measurement

and control terminal, suitable for the automation and information systems in various industries.

Features

Wide working temperature range: working at -40℃～+65℃, suitable for harsh working environment.

Non directional design of input power: This can avoid misconnection and over connection damage, increasing the reliability.

Modbus protocol: Q&A communication, easy to use and featuring cheap hardware and strong universal property.

High acquisition accuracy: it’s 0.1%FS.

All aluminum alloy shell: Good EMS performance, compact size, easy installation and good heat dissipation.

Watch dog: This can conduct the precise time layout. Once any exception occurs, the module will restart in 0.2s and continue to

work as previous parameters.

1. Electrical Parameters

1.1 E820-DTU（AI-485-4-5）

Parameter Name

Parameter value

Description

Size

82 * 84 *25mm

Pressing line interface is not included.

Average weight

150g

Pressing line interface is not included.

Input signal type

0—20mA/0-5V

Analog signal input range.

Acquisition channel

4 channel input

4 channel current collection and all differential voltage acquisition.

Acquisition rate

Full channel 10Hz

Acquisition rate for analog signal.

Interface

RS485：1 * 5 * 3.81 mm

Pressing line

Supply voltage

8 ~ 28V DC

Note: The module will be destroyed if the voltage is higher than 28V.

Working current

40mA

The over 100mA output current is recommended(when the output power is not used).

Communication level

RS232/RS485

RS232 or RS485.

Communication address

1-250

1-250 can be configurable, the default is 1.

Acquisition accuracy

0.1%FS

Accuracy of analog signal collection.

Baud rate

Default: 9600

It can be configured from 1200~115200.

Working temperature

-40℃～+65℃

Industrial grade.

Isolation protection

4000vDC

Lightening strike, Surge protection.

1.2 E820-DTU（II-485-4-20）

Parameter Name

Parameter value

Description

Size

82 * 84 *25mm

Pressing line interface is not included.

Average weight

150g

Pressing line interface is not included.

Input signal type

0—20mA

Analog signal input range.

Acquisition channel

4 channel input

4 channel Single-ended input of analog signal.

Acquisition rate

Full channel 10Hz

Acquisition rate for analog signal.

Interface

RS485：1 * 5 * 3.81 mm

Line pressing

Supply voltage

10 ~ 28V DC

Note: The module will be destroyed if the voltage is higher than 28V.

Working current

31mA

The over 100mA output current is recommended(when the output power is not used).

Communication level

RS232/RS485

RS232 or RS485

Communication

address

1-250

1-250 can be configurable, the default is 1.

Acquisition accuracy

0.1%FS

Accuracy of analog signal collection.

Baud rate

Default: 9600

It can be configured from 1200~115200.

Working temperature

-40℃～+65℃

Industrial grade.

Isolation protection

4000vDC

Lightening strike, Surge protection.

1.3 Series products

Model Number

Interface

Signal type

Acquisition accuracy

Analog channel

Protection level

VDC

Size

E820-DTU

（II-485-4-20）

RS485

0-20mA

0.1%FS

3000

82*84.25

E820-DTU

（VI-485-4-5）

RS485

0-5V

0.1%FS

3000

82*84.25

1.4 FAQ

No.

Questions

Description

Change baud rate

When using the upper computer, users need to close the upper computer first and reopen after changing the baud rate.

Forget the device address

Users can use 03 command to read FF monitoring.

1.5 Notice

No.

Notice

Description

Communication

connection

In connecting with other RS485 device, users need to pay attention to the match of A, B line and add 120R

matching resistance.

Input voltage

Only DC power supply is available, and the DC input voltage should be 10-28V

The device won’t work when lower than 10V, while the device will be destroyed when higher than 28V,

Output power supply

The positive and negative directions of output power is same with the input power. See more details in Pin

definition.

Analog input interface

The collection signal is 0-20Ma/0-5V, so user do not input the exceed nominal measured value, or it may cause

damage.

Waterproof

The device is not waterproof, please do not get the device wet, or it will be damaged.

2. Function Description

2.1 Pin definition

2.1.1 E820-DTU（AI-485-4-5）

Definition

Function

Description

DC-IN

Pressing line power input positive

Power input, range: DC10-28V. 12V, and 24V are recommended.

GND

Pressing line power input negative

Power supply GND.

AGND

Communication common ground

When communicating with RS485, the DTU won’t be used, while when

communicating with RS232, it will be grounded.

RS485_B

Interface B of RS-485

Interface B of RS-485 connected to Device B.

RS485_A

Interface A of RS-485

Interface A of RS-485 connected to Device A.

AI1+

Analog signal input channel 1 positive

Input pin of analog signal forms the input with the GND1 pin.

AI1-

Analog signal input channel 1 negative

To be used in pairs with VI1+.

AI2+

Analog signal input channel 2 positive

Input pin of analog signal, forms the input with the GND2 pin.

AI2-

Analog signal input channel 2 negative

To be used in pairs with VI2+.

AI3+

Analog signal input channel 3 positive

Input pin of analog signal, forms the input with the GND3 pin.

AI3-

Analog signal input channel 3 negative

To be used in pairs with VI3+.

AI4+

Analog signal input channel 4 positive

Input pin of analog signal forms the input with the GND4 pin.

AI4-

Analog signal input channel 4 negative

To be used in pairs with VI4+.

GND

Power supply output negative

The negative internal of power supply connected to pin 2 GND.

OUT-DC

Power supply output positive

Power supply output, the voltage is decided by the pin 1(internal connecting to

pin 1).

2.1.2 E820-DTU（II-485-4-20）

Definition

Function

Description

DC8-28V

Pressing line power input positive

Power input, range: DC10-28V. 12V, and 24V are recommended.

AI-

Pressing line power input negative

Power supply AI-.

AAI-

Communication common ground

When communicating with RS485, the DTU won’t be used, while when

communicating with RS232, it will be grounded.

RS485_B

Interface B of RS-485

Interface B of RS-485 connected to Device B.

RS485_A

Interface A of RS-485

Interface A of RS-485 connected to Device A.

AI1+

Analog signal input channel 1 positive

Input pin of analog signal forms the input with the AI1-.

AI1-

Analog signal input channel 1

negative

To be used in pairs with AI1+.

AI2+

Analog signal input channel 2 positive

Input pin of analog signal forms the input with the AI2-.

AI2-

Analog signal input channel 2

negative

To be used in pairs with AI2+.

AI3+

Analog signal input channel 3 positive

Input pin of analog signal forms the input with the AI3-.

AI3-

Analog signal input channel 3

negative

To be used in pairs with AI3+.

AI4+

Analog signal input channel 4 positive

Input pin of analog signal forms the input with the AI4-.

AI4-

Analog signal input channel 4

negative

To be used in pairs with AI4+.

AI-

Power supply output negative

The negative internal of power supply connected to AI-.

OUT-DC

Power supply output positive

Power supply output, the voltage is decided by the pin 1 (internal connecting to

pin 1).

2.2 Connection method

2.2.1 RS485 connection method

3. Register configuration table

3.1 ModBus address table

40001—40012、40017—40028、40042—40049 is not used in this device.

ModBus register address table

Address

Byte

variable names

Type

Description

40013

AI1 input

Read only

Unit 0.001mA/0.001V

40014

AI2 input

Read only

40015

AI3 input

Read only

40016

AI4 input

Read only

40029

reference voltage for channel 1

Read/write

Default 2400，Max. 3300，Min 2000，Unit 0.001V

40030

reference voltage for channel 2

Read/write

40031

reference voltage for channel 3

Read/write

40032

reference voltage for channel 4

Read/write

40033

ModBus address

Read/write

1-250（0xff is the monitoring address）

40034

Baud rate

Read/write

see more in baud rate table

40035

parity bit

Read/write

see more in parity bit table

40036

Lower limit register

Read/write

0-65535（Lower limit register must be less than the Upper limit

of upper and lower limits.

40037

Upper limit register

Read/write

40038

Conversion value for channel 1

Read only

The original data value transformed by the analog quantity of

channel 1

40039

Conversion value for channel 2

Read only

The original data value transformed by the analog quantity of

channel 2

40040

Conversion value for channel 3

Read only

The original data value transformed by the analog quantity of

channel 3

40041

Conversion value for channel 3

Read only

The original data value transformed by the analog quantity of

channel 4

3.2 Baud rate code table

Baud rate code table

1200

2400

4800

3（default）

9600

19200

38400

57600

1152200

3.3 Parity bit code table

Parity bit code table

0（default）

No parity

Even parity

Odd parity

4. 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:

00 21

00 01

D4 00

ModBus Address

To read command

To read the address of register

To read the length of register

CRC parity code

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

00 03

F8 48

ModBus Address

To read command

To read the return bytes

The value of 40034 is 3，which means

the baud rate is 9600，see more

details in baud rate value table.

CRC parity code

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 device. CRC parity check code can be calculated by CRC16 system, the assistant software can be downloaded

in 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 address of 40034 to 40036:

00 21

00 03

55 C1

ModBus address

To read command

To read the address of register

To read the length of register

CRC parity code

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

00 03

00 00

65 75

ModBus

address

To read command

To read the

return bytes

The value of 40034 is 3，

which means the baud

rate is 9600，see more

details in baud rate value

table.

The value of 40035 is 0,

the parity bit of device

is no parity, see more

details in parity check

code table.

The value of 40036 is 0

CRC parity code

4.3 Input “06” to write the command of register

Input “06”to write single command, below is the command to change the baud rate as 19200：

00 21

00 04

D8 03

ModBus address

To write command

Write in 40034 register

The write value of 40034 is 4, the

corresponding baud rate is 19200,

see more details in baud rate table

CRC parity code

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

4.4 Factory default value

Device address

Baud rate

Voltage for reference

Parity check code

40033 address is 1

9600，that is, 40034 address is 3

2400

No parity check：40035 address is 0

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