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Modbus86 Slave

[Modbus]

Modbus86 Slave 能使 86Duino 模擬成 Modbus Slave 節點，在通道上接收指令並執行回呼函式。

範例

啟用 RS485 並使用 Modbus RTU 作為通訊方式的 Slave 裝置範例。

#include <Modbus86.h>
 
ModbusSlave bus;
ModbusSlaveNode node;
 
uint32_t command = 0;
uint32_t lasttime = 0;
 
uint8_t read_holding_registers( uint8_t function,
                                uint16_t address,
                                uint16_t length)
{
    for (int i = address; i < address + length; i++) {
        if (i == 16)
            node.writeHoldingRegister(i, command & 0xFFFF);
        else if (i == 17)
            node.writeHoldingRegister(i, (command >> 16) & 0xFFFF);
    }
     
    return MODBUS_SUCCESS;
}
 
uint8_t read_input_registers(   uint8_t function,
                                uint16_t address,
                                uint16_t length)
{
    int sensorPin = A2;
 
    if (address <= 2 && address + length > 2)
        node.writeInputRegister(2, analogRead(sensorPin));
     
    return MODBUS_SUCCESS;
}
 
uint8_t write_multiple_registers(   uint8_t function,
                                    uint16_t address,
                                    uint16_t length)
{
    int i;
 
    for (i = address; i < address + length; i++) {
        if (i == 16)
            command = (command & 0xFFFF0000) | node.readHoldingRegister(i);
        else if (i == 17)
            command = 
                (command & 0x0000FFFF) | (node.readHoldingRegister(i) << 16);
    }
 
    return MODBUS_SUCCESS;
}
 
uint8_t write_single_coil(  uint8_t function,
                            uint16_t address,
                            uint16_t length)
{
    uint16_t value;
     
    if (address == 0) {
        node.readCoil(address, 1, &value);
        if (value)
            digitalWrite(LED_BUILTIN, HIGH);
        else
            digitalWrite(LED_BUILTIN, LOW);
    }
 
    return MODBUS_SUCCESS;
}
 
void setup()
{
    pinMode(LED_BUILTIN, OUTPUT);
     
    Serial485.begin(115200);
     
    /* Modbus RTU Mode via RS485. */
    bus.begin(MODBUS_RTU, Serial485);
     
    /* Slave node with ID 11. */
    node.attach(11, bus);
 
    /* Set the callback function of Read Holding Registers (0x03). */
    node.cbFunc[MODBUS_CB_READ_HOLDING_REGISTERS]
                            = read_holding_registers;
 
    /* Set the callback function of Read Input Registers (0x04). */
    node.cbFunc[MODBUS_CB_READ_INPUT_REGISTERS]
                            = read_input_registers;
     
    /* Set the callback function of Write Single Coil (0x05). */
    node.cbFunc[MODBUS_CB_WRITE_SINGLE_COIL]
                            = write_single_coil;
     
    /* Set the callback function of Write Multiple Registers (0x10). */
    node.cbFunc[MODBUS_CB_WRITE_MULTIPLE_REGISTERS]
                            = write_multiple_registers;
}
 
void loop()
{
    uint32_t now;
     
    node.poll();
     
    now = millis();
    if (now - lasttime > 500) {
        lasttime = now;
        Serial.print("commnad = ");
        Serial.println(command);
    }
}

啟用 Ethernet 並使用 Modbus TCP 作為通訊方式的 Slave 裝置範例。

#include <Ethernet.h>
#include <Modbus86.h>
 
ModbusSlave bus;
ModbusSlaveNode node;
 
byte mac[] = {0x00, 0x00, 0x00, 0x00, 0x00, 0x00};
IPAddress localIp(192,168,1,102);
 
uint32_t command = 0;
uint32_t lasttime = 0;
 
uint8_t read_holding_registers( uint8_t function,
                                uint16_t address,
                                uint16_t length)
{
    for (int i = address; i < address + length; i++) {
        if (i == 16)
            node.writeHoldingRegister(i, command & 0xFFFF);
        else if (i == 17)
            node.writeHoldingRegister(i, (command >> 16) & 0xFFFF);
    }
     
    return MODBUS_SUCCESS;
}
 
uint8_t read_input_registers(   uint8_t function,
                                uint16_t address,
                                uint16_t length)
{
    int sensorPin = A2;
 
    if (address <= 2 && address + length > 2)
        node.writeInputRegister(2, analogRead(sensorPin));
     
    return MODBUS_SUCCESS;
}
 
uint8_t write_multiple_registers(   uint8_t function,
                                    uint16_t address,
                                    uint16_t length)
{
    int i;
 
    for (i = address; i < address + length; i++) {
        if (i == 16)
            command = (command & 0xFFFF0000) | node.readHoldingRegister(i);
        else if (i == 17)
            command =
                (command & 0x0000FFFF) | (node.readHoldingRegister(i) << 16);
    }
 
    return MODBUS_SUCCESS;
}
 
uint8_t write_single_coil(  uint8_t function,
                            uint16_t address,
                            uint16_t length)
{
    uint16_t value;
     
    if (address == 0) {
        node.readCoil(address, 1, &value);
        if (value)
            digitalWrite(LED_BUILTIN, HIGH);
        else
            digitalWrite(LED_BUILTIN, LOW);
    }
 
    return MODBUS_SUCCESS;
}
 
void setup()
{
    pinMode(LED_BUILTIN, OUTPUT);
     
    Ethernet.begin(mac, localIp);
     
    /* Modbus TCP Mode via Ethernet. */
    bus.begin(MODBUS_TCP);
     
    /* Slave node initialize. */
    node.attach(11, bus);
 
    /* Set the callback function of Read Holding Registers (0x03). */
    node.cbFunc[MODBUS_CB_READ_HOLDING_REGISTERS]
                            = read_holding_registers;
 
    /* Set the callback function of Read Input Registers (0x04). */
    node.cbFunc[MODBUS_CB_READ_INPUT_REGISTERS]
                            = read_input_registers;
     
    /* Set the callback function of Write Single Coil (0x05). */
    node.cbFunc[MODBUS_CB_WRITE_SINGLE_COIL]
                            = write_single_coil;
     
    /* Set the callback function of Write Multiple Registers (0x10). */
    node.cbFunc[MODBUS_CB_WRITE_MULTIPLE_REGISTERS]
                            = write_multiple_registers;
}
 
void loop()
{
    uint32_t now;
     
    node.poll();
     
    now = millis();
    if (now - lasttime > 500) {
        lasttime = now;
        Serial.print("commnad = ");
        Serial.println(command);
    }
}

函式庫參考主頁面

86Duino 參考的文本是根據 Creative Commons Attribution-ShareAlike 3.0 License，部分文本是從 the Arduino reference 修改的。 參考中的代碼示例已發佈到公共領域。

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