编写程序:modbus-rtu 主机自动读取按键值,主机读取一次,io口状态复位,如果经过1s未读取,io口状态复位
时间: 2023-07-17 21:01:13 浏览: 46
你可以使用以下示例代码来实现Modbus-RTU主机自动读取按键值并进行状态复位的功能:
```python
import time
import minimalmodbus
import RPi.GPIO as GPIO
# 定义按键GPIO口
button_pin = 17
# 定义Modbus RTU从机地址
slave_address = 1
# 定义Modbus RTU串口参数
port = '/dev/ttyUSB0'
baudrate = 9600
parity = 'N'
data_bit = 8
stop_bit = 1
# 初始化GPIO口和Modbus RTU通信
GPIO.setmode(GPIO.BCM)
GPIO.setup(button_pin, GPIO.IN)
instrument = minimalmodbus.Instrument(port, slave_address)
instrument.serial.baudrate = baudrate
instrument.serial.parity = parity
instrument.serial.bytesize = data_bit
instrument.serial.stopbits = stop_bit
instrument.serial.timeout = 1
# 读取按键值并进行处理
def read_button():
button_value = GPIO.input(button_pin)
# 发送Modbus RTU读取按键值的命令
instrument.write_register(0, button_value, functioncode=6)
time.sleep(0.1)
# 读取从机返回的按键值
response = instrument.read_registers(0, 1, functioncode=3)
if response:
button_state = response[0]
print("Button state:", button_state)
# 根据按键状态进行处理
if button_state == 1:
print("Button pressed!")
else:
print("Button released!")
# 等待1秒并复位IO口状态
time.sleep(1)
instrument.write_register(0, 0, functioncode=6)
try:
while True:
read_button()
except KeyboardInterrupt:
GPIO.cleanup()
```
请注意,以上代码基于树莓派(Raspberry Pi)平台和Python语言进行编写,使用了minimalmodbus库来实现Modbus RTU通信。你需要根据实际情况进行适配和调试,并确保正确连接了按键和Modbus RTU主机。