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helloworld.py
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Sat, Mar 22, 10:22

helloworld.py
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#!/usr/bin/python
# -*- coding: utf-8 -*-
import os, sys
# add ../../Sources to the PYTHONPATH
sys.path.append(os.path.join("..", "..", "Sources"))
from yocto_api import *
from yocto_serialport import *
# Setup the API to use local USB devices. You can
# use an IP address instead of 'usb' if the device
# is connected to a network.
errmsg = YRefParam()
if YAPI.RegisterHub("usb", errmsg) != YAPI.SUCCESS:
sys.exit("init error" + errmsg.value)
if len(sys.argv) > 1:
serialPort = YSerialPort.FindSerialPort(sys.argv[1])
else:
serialPort = YSerialPort.FirstSerialPort()
if serialPort is None:
sys.exit('No module connected (check cable)')
print("Please enter the MODBUS slave address (1...255)")
slave = 0
while (slave < 1) or (slave > 255):
slave = int(input("slave: ")) # use raw_input in python 2.x
reg = 0
while (reg < 1) or (reg >= 50000) or (reg % 10000) == 0:
print("Please select a Coil No (>=1), Input Bit No (>=10001+),")
print("Input Register No (>=30001) or Register No (>=40001)")
reg = int(input("No: ")) # use raw_input in python 2.x
while serialPort.isOnline():
if reg >= 40001:
val = serialPort.modbusReadRegisters(slave, reg - 40001, 1)[0]
elif reg >= 30001:
val = serialPort.modbusReadInputRegisters(slave, reg - 30001, 1)[0]
elif reg >= 10001:
val = serialPort.modbusReadInputBits(slave, reg - 10001, 1)[0]
else:
val = serialPort.modbusReadBits(slave, reg - 1, 1)[0]
print("Current value: " + str(val))
print("Press ENTER to read again, Q to quit")
if (reg % 30000) < 10000:
print(" or enter a new value")
cmd = input(": ") # use raw_input in python 2.x
if (cmd == "q") or (cmd == "Q"):
sys.exit()
if cmd != "" and ((reg % 30000) < 10000):
val = int(cmd)
if reg >= 30001:
serialPort.modbusWriteRegister(slave, reg - 30001, val)
else:
serialPort.modbusWriteBit(slave, reg - 1, val)
YAPI.FreeAPI()

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