N4CID08N4CIE16N4CIF24MODBUSRTU Commamd

MODBUS command (function code, write 06/16, read 04/03)

Note :

1  MODBUS command must be HEX

2  Slave address (device address) must be the same as the setting. You can also use this command to query the current device address: FF 03 00 FD 00 01 00 24 3 The Baudrate and parity should be consistent

Command overview:

Channels

SKU

Product ID

Channel assignment

16

N4CID08

2508

CH1-CH8          : 0-20MA

32

N4CIE16

2516

CH1-CH15        : 0-20MA

CH16                  : 0-30V

48

N4CIF24

2524

CH1-CH22        : 0-20MA

CH23-CH24        : 0-30V

Supported function codes:

Function

Code

Modbus

Address

(PLC)

Register

Address

Describe

 

04：

30001

0x0000-0x00017

(0-23)

Unit：

0.01MA/0.01V

N4CID08：

0x0000-0x0007

: 0-20MA

N4CIE16:

0x0000-0x000E

: 0-20MA

 

 

 

0x000F

: 0-30V

N4CIF24:

0x0000-0x0015

: 0-20MA

 

 

 

0x0016-0x0017

: 0-30V

03

40001

 

 

 

0x0080-0x00FF

(128-255)

Read special function registers (baud rate 485 address, etc.)

06

40001

 

 

0x0080-0x00FF

(128-255)

Write a single special function register (baud rate

485 address, etc.)

16(0x10)

40001

 

 

0x0080-0x00FF

(128-255)

Write multiple special function registers (baud rate 485 address, etc.)

All states are mapped into 4xxxx range registers. The user can monitor the input and output status of the module by reading or modifying the value of the 4xxxx interval register (03 06

16 function code)

 

Register address

Register contents

Register value

Remarks

R/W

0x00A0-0x00B7

(160-183)

AI analog input

Current unit: 0.01ma

Voltage unit: 0.01V

N4CID08：

0x00A0-0x00A7         : 0-20MA

R

N4CIE16:

0x00A0-0x00AE         : 0-20MA

0x00AF                           : 0-30V

 

N4CIF24:

0x00A0-0x00B5         : 0-20MA

0x00B6-0x00B7         : 0-30V

 

0x00C0-0x00D7

(192-215)

This value can be corrected when the current reading deviation is greater than 1%, such as:

1000 means 1:1

1010: 1% increase

990: 1% decrease

R/W

 

 

 

 

 

0X00F6

(246)

AI analog automatic reporting Registers

(160-167)               are

automatically reported

0:      Query      function      (default)      1-255:

Automatically report, the unit is second.

1: Report every 1 second

2: Report every 2 seconds

10: Report every 10 seconds Maximum interval of 255 seconds

 

0x00F7

(247)

Product ID

0-65535

     SKU                   ID

N4AIA08           2508

N4AIB16           2516

N4AIC24           2524

 

0x00FB

(251)

Factory Reset

Factory Reset：

1 1 Short the RES jumper for 5 seconds 2 Enter the following command at the current baud rate:

FF 06 00 FB 00 00 ED E5

R/W

0x00FC

(252)

Command        Return

Time

0-25

Time interval for command return (unit: 40MS) Setting value: 0-25

R/W

0x00FD

(253)

RS485 address

(Station address)

Read       address：FF 03 00 FD 00 01 00 24；

Set address to 0x02:

FF 06 00 FD 00 02 8C 25

R/W

0x00FE

(254)

Baud rate

0-255

0:1200     1:2400       2:4800

3:9600（default）4:19200

5:38400       6：57600

7：115200

Others：Factory reset

R/W

0x00FF

(255)

Parity

0-2

0  None Parity

1  Even Parity

R/W

 

 

 

2 Odd Parity

 

9600 Band ,8 Data bits,None Parity,1 Stop Bit。

MODBUS commands you can use "Modbus Poll" input, as shown below

（CRC check generated automatically）

You can also use HyperTerminal serial input, as shown below

（Manually add CRC check）

1.Read AI analog input value:

Send data

RS485 address

(Station address)

(1)

Functio n (1)

Register

(2)

 

address

Read number (2)

CRC16(2

)

Returns data

 

 

 

 

 

 

RS485 address

(Station address)

(1)

Functio n (1)

Number

(1)

of

bytes

data (n)

CRC16(2

)

Modbus Address(PLC)：30001-30008

RS485 address : 0x01~0x3F

Function code: 0x04

Register address:0x0000-0x0007 Read number :0x0001-0x0008

Forexample,Readthe valueofAIanaloginputofchannel1-8 (channel 8 is 3.95MA, other channels are 0MA):

Send data(address 1): 01 04 00 00 00 08 F1 CC

        Return data       : 01 04 10 00 00 00 00 00 00 00 00 00 00 00 00 00

00  01 8B 14 DB

01  RS485 address, 04 function code, 10 length, 018B represents the value of channel 8, which is 395 in decimal, /100=3.95MA.

In addition, the AI analog input is also mapped to the 40000 interval register. The user can read the value of the AI analog input through the 03 function code.

Modbus Address(PLC)：40161-40168

RS485 address : 0x01~0x3F

Function code:0x03

Register address:0x00A0-0x00A7 Read number: 0x0008

Forexample,Readthe valueofAIanaloginputofchannel1-8 (channel 8 is 3.95MA, other channels are 0MA):

Send data(address 1): 01 03 00 A0 00 08 44 2E

Return data : 01 03 10 00 00 00 00 00 00 00 00 00 00 00 00 00 00 01 8B A5 AE

01 RS485 address, 03 function code, 10 length, 018B represents the value of channel 8, which is 395 in decimal, /100=3.95MA.

2.Set the AI scale value (correction value) :

Send data

RS485 address

(Station address)

(1)

Functio n (1)

Register

(2)

 

address

Read number (2)

CRC16(2

)

Returns data

 

 

 

 

 

 

RS485 address

(Station address)

(1)

Functio n (1)

Number

(1)

of

bytes

data (n)

CRC16(2

)

Modbus Address(PLC)：40193-40200

RS485 address : 0x01~0x3F

Function code:Write 0x06/0x10,Read 0x03 Register address:0x00C0-0x00C7

The voltage ratio can be corrected by this value when the voltage readingdeviationisgreaterthan1%.Thedefaultvalueis1000(3E8).

Forexample1:Theactualvoltageofchannel1is5.00V,butthereadvalue isonly4.00V.Theratiodeviationis5/4=1.25,andthecorrectionvoltage ratio is changed to 1250, which can correct the voltage.

Send frame: 010600C004E20B7F

Return frame: 010600C004E20B7F

The return frame is the same as the send frame. 07 means channel 1, 04 E2 means correction voltage ratio is 1250

Forexample2:Theactualvoltageofchannel1is4.00V,butthereadvalue isonly5.00V.Theratiodeviationis4/5=0.8,andthecorrectionvoltage ratio is changed to 800, which can correct the voltage.

Send frame: 010600C10320D91E

Return frame: 010600C10320D91E

The return frame is the same as the send frame. 08 means channel 2, 03

20 means correction voltage ratio is 800

Special function Register

1.Set the 485 address(Slave ID)

Send data

RS485 address

(Station address)

(1)

Functio n (1)

Register

(2)

 

address

Read number (2)

CRC16(2

)

Returns data

 

 

 

 

 

 

RS485 address

(Station address)

(1)

Functio n (1)

Number

(1)

of

bytes

data (n)

CRC16(2

)

Modbus Address(PLC)：40254

RS485 address :0x01~0Xf8/0XFF

Function code:Write 0x06/0x10,Read 0x03

Register address:0x00FD(253)

Value: 2 bytes (values 1-248)

For example 1: Set the current device address to 0x02

Send data(address is 1): 01 06 00 FD 00 02 99 FB

Return data         : 01 06 00 FD 00 02 99 FB

Send data(don't know the address): FF 06 00 FD 00 02 8C 25

Return data         : FF 06 00 FD 00 02 8C 25

For example 2: Read device address(0X0001)

Send data   : FF 03 00 FD 00 01 00 24 Return data : FF 03 02 00 01 50 50

Note：With this command, there can be only one module on the bus 485， More than one will go wrong!

2.Write baud rate Send data

RS485 address

(Station address)

(1)

Functio n (1)

Register

(2)

 

address

Read number (2)

CRC16(2

)

Returns data

 

 

 

 

 

 

RS485 address

(Station address)

(1)

Functio n (1)

Number

(1)

of

bytes

data (n)

CRC16(2

)

Modbus Address(PLC)：40255

RS485 address :0x01~0x3F

Function code:Write 0x06/0x16;Read 0x03

Register address:0x00FE(254) Value: 2 bytes (values 0-7)

For example 1, Change the baud rate to 4800bps:

Send data(address 1):01 06 00 FE 00 02 69 FB

Return data         :01 06 00 FE 00 02 69 FB

Baud rate corresponds to the number: 0:1200 1:2400 2:4800 3:9600

4:19200 5:38400 6:57600 7: 115200 8: Factory reset

Note: 1 The baud rate will be updated only when the module is powered on again when this command is used!

2 When the number corresponding to the baud rate is 8, the factory settings can be restored For example:01 06 00 FE 00 08 E9 FC

For example 2 Read the current baud rate:

Send data(address 1):01 03 00 FE 00 01 E5 FA Return data    :01 03 02 00 03 F8 45

01RS485 address，03Function,02length,F845crc16,03 meansthecurrent baud rate is 9600bps

Baud rate corresponds to the number: 0:1200 1:2400 2:4800 3:9600 4:19200 5：38400 6:57600 7: 115200

3.Set Command(Date) Return Time Send data

RS485 address

(Station address)

(1)

Functio n (1)

Register

(2)

 

address

Read number (2)

CRC16(2

)

Returns data

 

 

 

 

 

 

RS485 address

(Station address)

(1)

Functio n (1)

Number

(1)

of

bytes

data (n)

CRC16(2

)

Modbus Address(PLC)：40253

RS485 address :0x01~0x3F

Function code:Write 0x06/0x16;Read 0x03

Register address:0x00FC(252) Value: 2 bytes (values 0-25)

For example, set the data return delay to 200ms

Send data(address 1):01 06 00 FC 00 05 89 F9

Return data         :01 06 00 FC 00 05 89 F9

Return the delay time calculation formula:X = 05 * 40 = 200MS

Note: The maximum can be set to 1000MS. If it exceeds 1000MS, that is, the setting value is greater than 25, and the data return delay will be initialized.

That is: 01 06 00 FC 00 20 48 22 can make the data return delay to restore initialization 0

4.Set Parity

Send data

RS485 address

(Station address)

(1)

Functio n (1)

Register

(2)

 

address

Read number (2)

CRC16(2

)

Returns data

 

 

 

 

 

 

RS485 address

(Station address)

(1)

Functio n (1)

Number

(1)

of

bytes

data (n)

CRC16(2

)

Modbus Address(PLC)：40256

RS485 address :0x01~0x3F

Function code:Write 0x06/0x16;Read 0x03

Register address:0x00FF(255) Value: 2 bytes (values 0-2)

For example, set the parity to Even parity

Send data(address 1):01 06 00 FF 00 01 78 3A

Return data         :01 06 00 FF 00 01 78 3A

0 None Parity 1 Even Parity 2 Odd Parity

Note: 1. When using this command, the module is powered on again, and the check digit will be updated!

2. When the setting is greater than 2, the default value will be restored to 0 after powering on again, and there will be no verification.

5.Factory reset: Send data

RS485 address

(Station address)

(1)

Functio n (1)

Register

(2)

 

address

Read number (2)

CRC16(2

)

Returns data

 

 

 

 

 

 

RS485 address

(Station address)

(1)

Functio n (1)

Number

(1)

of

bytes

data (n)

CRC16(2

)

Modbus Address(PLC)：40252

RS485 address : 0x01~0x3F

Function code:Write 0x06;

Register address:0x00FB(251)

Send data(address 1):FF 06 00 FB 00 00 ED E5

Return data         :FF 06 00 FB 00 00 ED E5

Hardware reset: Short the RES jumper of the board for 5 seconds, then power on again.