async def writeSingleRegister(self, reader):
data = await reader.read(4)
registerAddress = modbusUtils.bytes2int(data[0:2])
registerValue = modbusUtils.bytes2int(data[2:4])
offset = self.PDUTranslationTable['holdingRegisters']
self.memory[offset + registerAddress] = registerValue
return data
async def readDiscreteInputs(self, reader):
startingAddress = modbusUtils.bytes2int(await reader.read(2))
quantityOfInputs = modbusUtils.bytes2int(await reader.read(2))
offset = self.PDUTranslationTable['discreteInput']
inputStatus = modbusUtils.compressBools(
self.memory[offset + startingAddress:offset + startingAddress +
quantityOfInputs])
byteCount = len(inputStatus)
return modbusUtils.int2bytes(byteCount) + inputStatus
async def readCoils(self, reader):
startingAddress = modbusUtils.bytes2int(await reader.read(2))
quantityOfCoils = modbusUtils.bytes2int(await reader.read(2))
offset = self.PDUTranslationTable['coils']
coilStatus = modbusUtils.compressBools(
self.memory[offset + startingAddress:offset + startingAddress +
quantityOfCoils])
byteCount = len(coilStatus)
return modbusUtils.int2bytes(byteCount) + coilStatus
async def writeSingleCoil(self, reader):
data = await reader.read(4)
outputAddress = modbusUtils.bytes2int(data[0:2])
outputValue = modbusUtils.bytes2int(data[2:4])
offset = self.PDUTranslationTable['coils']
if outputValue == 0x0000:
self.memory[offset + outputAddress] = 0
elif outputValue == 0xFF00:
self.memory[offset + outputAddress] = 1
return data
async def readInputRegisters(self, reader):
startingAddress = modbusUtils.bytes2int(await reader.read(2))
quantityOfInputRegisters = modbusUtils.bytes2int(await reader.read(2))
offset = self.PDUTranslationTable['inputRegisters']
inputRegisters = b''.join(
map(
lambda x: x.to_bytes(2, 'big'),
self.memory[offset + startingAddress:offset + startingAddress +
quantityOfInputRegisters]))
byteCount = len(inputRegisters)
return modbusUtils.int2bytes(byteCount) + inputRegisters
async def writeMultipleCoils(self, reader):
data = await reader.read(5)
startingAddress = modbusUtils.bytes2int(data[0:2])
quantityOfOutputs = modbusUtils.bytes2int(data[2:4])
byteCount = modbusUtils.bytes2int(data[4:5])
outputValue = modbusUtils.zeroPadOrTruncate(
modbusUtils.decompressBools(await reader.read(byteCount)),
quantityOfOutputs)
offset = self.PDUTranslationTable['coils']
self.memory[offset + startingAddress:offset + startingAddress +
quantityOfOutputs] = outputValue
return data[0:4]
async def writeMultipleRegisters(self, reader):
data = await reader.read(5)
startingAddress = modbusUtils.bytes2int(data[0:2])
quantityOfRegisters = modbusUtils.bytes2int(data[2:4])
byteCount = modbusUtils.bytes2int(data[4:5])
registersValue = await reader.read(byteCount)
registersValue = list(
map(modbusUtils.bytes2int,
modbusUtils.splitIntoChunks(registersValue, 2)))
offset = self.PDUTranslationTable['holdingRegisters']
self.memory[offset + startingAddress:offset + startingAddress +
quantityOfRegisters] = registersValue
return data[0:4]