Basic functions:Support standard MODBUS devices such as text, touch screen, PLC, etc.

24-way switching input (12V, 24V)Photoelectric isolation,Support NPN and PNP input
1-way standard 485 communication port,Photoelectric isolation(Supporting modbus-RTU protocol free port communication protocol)

Code Function Support Function Code:

Function code	Definition	Operations (binary)
0x02	Read switch input	Read one or more switch state input data
0x01	Read switch output	Read one or more switch output status data
0x030x04	Read register data	Read data from one or more registers
0x050X0F	Write switch outputWrite multiple switches	Control all the wayRelay"Hop / sub" output
0x06	Write single path register	Write a set of binary data into a single register
0x10	Write multiplexer register	Write multiple sets of binary data into multiple registers

**************************************************************************************************************

The default configuration is as follows:

MODBUS address1

Baud rate: 96008Bit data bits1 bit stop bits
No check10001-10016 16 switch input**********************************************

Read analog input (0x04)

Host sends:Addr 04 regH regL NumH numL crcH crcL

From the machine back:Addr 04 len d0H d0L...DnH dnL crcH crcL

Interpretation: Register address from0Start counting.numH numLRepresents the number of routes of the analog quantity to be read. This card has 5 analog input channels.10bitADCEach analog takes up two bytes of data. For example, to read the2Lu He3The register address is0001The number of registers is0002 For example, to read all analog quantities1Lu Zhi di8The address of the register is uuuuuuuuuuuuu0000The number of registers is0008 Return data0-0x3FFRepresents the collected analog quantities, such as analog quantities.0-20mAThe data read are18CThe decimal number is396So the current value isI = 20mA*396/1023 = 7.742mA Sensors are generally4-20mAIf the reading value is less than4mAThe connection line is faulty.

Example: read the first1Lu Zhi di8Road analogue

Host sends:01 04 00 00 08 F1 CC

From the machine back:0104 0C d0H d0L...D5H d5L crcH crcL

-Analog quantityInput and outputVC source code(clear notes):// Read the status of a single register
//ip_Addr slave MODBUS address
//data_Addr Data Storage Register Address
UInt16 readBUF (byte ip_Addr, UInt16 data_Addr)
{
UInt16 crc; //check value
Byte [] MSG = new byte [8]; // instruction array

MSG [0] = ip_Addr; //slave address
MSG [1] = 0x04; // Read a single register
MSG [2] = byte (data_Addr > 8); high bit of // register address
MSG [3]= (byte) data_Addr; low bit // register address
MSG [4] = 0x00; high bit of data length to read
MSG [5] = 0x01; the base length of the data to be read
CRC = CRC16 (msg, 6);
MSG [6] = byte (crc > 8); 8 digits higher in // check
MSG [7] = (byte) crc; //check low 8 bits

Comm.Write(msg); //Send Read Request Zheng

Receive_A_Frame(); //Receive the Zhen reply signal

// Add here: Judge the received data
}

...More source code, please contact the seller after buying.

16-way Switch Input Photoelectric Isolation 485 MODBUS Protocol Supports Common anode and Common cathode NPNPNP input

Price: $35.85

Basic functions:Support standard MODBUS devices such as text, touch screen, PLC, etc.

Add you Tags