arduino串口数据接收
#include <SimpleModbusMaster.h>/*
The example will use packet1 to read a register from address 0 (the adc ch0 value)
from the arduino slave (id=1). It will then use this value to adjust the brightness
of an led on pin 9 using PWM.
It will then use packet2 to write a register (its own adc ch0 value) to address 1
on the arduino slave (id=1) adjusting the brightness of an led on pin 9 using PWM.
*/
//////////////////// Port information ///////////////////
#define baud 9600
#define timeout 1000
#define polling 200 // the scan rate
#define retry_count 10
// used to toggle the receive/transmit pin on the driver
#define TxEnablePin 2
#define LED 9
// The total amount of available memory on the master to store data
#define TOTAL_NO_OF_REGISTERS 2
// This is the easiest way to create new packets
// Add as many as you want. TOTAL_NO_OF_PACKETS
// is automatically updated.
enum
{
PACKET1,
PACKET2,
TOTAL_NO_OF_PACKETS // leave this last entry
};
// Create an array of Packets to be configured
Packet packets;
// Masters register array
unsigned int regs;
void setup()
{
// Initialize each packet
modbus_construct(&packets, 01, READ_INPUT_REGISTERS, 257, 03, 00);
// Initialize the Modbus Finite State Machine
modbus_configure(&Serial, baud, SERIAL_8N2, timeout, polling, retry_count, TxEnablePin, packets, TOTAL_NO_OF_PACKETS, regs);
pinMode(LED, OUTPUT);
}
void loop()
{
modbus_update();
//regs = analogRead(0);
// update data to be written to arduino slave
Serial.println(regs);
//analogWrite(LED, regs>>2);
// constrain adc value from the arduino slave to 255
Serial.println("-------");
delay(2000);
}
求大神看一下 我这个程序 要实现的功能是用arduino采集rs485的电压值载入程序之后 tx闪 ttl的tx也闪 rs485也闪 只有arduino的rx不闪串口监视器显示的数据是300-400的数值求指教 哪里 不对啊
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