Ebyte E820-AIO User manual

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-AIO（II-485-4-20）

Parameter

Name

Parameter value

Description

Size

108 * 75 *37mm

Pressing line interface is not included.

Average weight

226g

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

5 ~ 36V DC

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

36V.

Working

current

12V/50mA

5V/90mA，12V/50mA，24V/30mA，36V/20mA(The over 100mA output

current is recommended when the output power is not used).

Communicatio

n level

RS485

Communicatio

n address

1-247

1-247 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

3000vDC

Lightening strike, Surge protection.

1.2 Series products

Model Number

Interface

Signal type

Acquisition

accuracy

Analog

channel

Protection

level VDC

Size

E820-AIO

（II-485-4-20）

RS485

0-20mA

0.1%FS

3000

82*84.25

1.3 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.

1.4 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

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_A

Interface A of RS-485

Interface A of RS-485 connected to Device A.

RS485_B

Interface B of RS-485

Interface B of RS-485 connected to Device B.

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.

Vout

Power supply output positive

Power supply output, the voltage is decided by the pin

1(internal connecting to pin 1).

reset

Long press to reset the equipment parameters to

factory settings. Reset success L1 and L2 indicator

lights flash once

Earthing

pole

Earthing pole

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

30013

AI4 input

Read only

Unit 0.001mA/0.001V

30014

AI3 input

Read only

30015

AI2 input

Read only

30016

AI1 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）

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

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 register . After the

configuration, channel 1-4 will be the

range 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

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

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

To read the length of

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

The value of

40035 is 0, the

parity bit of

device is no

parity, see more

details in parity

The value of

40036 is 0

CRC parity

code

rate value table.

check code

table.

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

5. 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 followed by a blank.

5.2.E820 testing software

In the upper monitor software, the start address of register is set in the address column, the length should

be from start address to end address. For example, address is 1, which 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 current

channel converted to the original value after collection.

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