if mod['parity'] == "E":
instrument.serial.parity = serial.PARITY_EVEN
if mod['parity'] == "N":
instrument.serial.parity = serial.PARITY_NONE
writestring = ("{},{}").format(d.hour*60*60+d.minute*60+d.second,channel['channel'])
try:
writestring+= (",{}").format(instrument.read_string(103))
except ValueError as e:
print(e)
for register in mod['registers']:
writestring += ","
value = -1
if register['only'] == "" or register['only'] == channel['type']:
if register['float'] != -1:
try:
#value = instrument.read_float(register['float'])
values = instrument.read_registers(register['float'],numberOfRegisters=2)
registerstring = chr(values[1].to_bytes(2,byteorder='big')[0]) + chr(values[1].to_bytes(2,byteorder='big')[1]) + chr(values[0].to_bytes(2,byteorder='big')[0]) + chr(values[1].to_bytes(2,byteorder='big')[1])
value = minmod._bytestringToFloat(registerstring)
except ValueError as e:
print(e)
writestring += ("{}").format(value)
writestring += "\n"
print(writestring)
time.sleep(5)
try:
writestring+= (",{}").format(instrument.read_string(103))
except ValueError as e:
print(e)
for register in mod['registers']:
headerstring += ("{},").format(register['name'])
unitstring += ("{},").format(register['units'])
writestring += ","
value = "NA"
if register['only'] == "" or register['only'] == channel['type']:
if register['float'] != "NA":
try:
#value = instrument.read_float(register['float'])
values = instrument.read_registers(register['float'],numberOfRegisters=2)
registerstring = chr(values[1].to_bytes(2,byteorder='big')[0]) + chr(values[1].to_bytes(2,byteorder='big')[1]) + chr(values[0].to_bytes(2,byteorder='big')[0]) + chr(values[1].to_bytes(2,byteorder='big')[1])
value = minmod._bytestringToFloat(registerstring)*register['convert']
except ValueError as e:
print(e)
print("Value: {}".format(value))
writestring += ("{}").format(value)
headerstring += "\n"
unitstring += "\n"
writestring += "\n"
print(writestring)
if d.hour < mod['savetime']:
datafilepath = monthpath + ("{}-{}-{}+{}hr.csv").format(d.year,d.month,d.day-1,mod['savetime'])
else:
datafilepath = monthpath + ("{}-{}-{}+{}hr.csv").format(d.year,d.month,d.day,mod['savetime'])
instrument.serial.parity = serial.PARITY_NONE
writestring = ("{},{}").format(d.hour * 60 * 60 + d.minute * 60 + d.second, channel["channel"])
try:
writestring += (",{}").format(instrument.read_string(103))
except ValueError as e:
print(e)
for register in mod["registers"]:
writestring += ","
value = -1
if register["only"] == "" or register["only"] == channel["type"]:
if register["float"] != -1:
try:
# value = instrument.read_float(register['float'])
values = instrument.read_registers(register["float"], numberOfRegisters=2)
registerstring = (
chr(values[1].to_bytes(2, byteorder="big")[0])
+ chr(values[1].to_bytes(2, byteorder="big")[1])
+ chr(values[0].to_bytes(2, byteorder="big")[0])
+ chr(values[1].to_bytes(2, byteorder="big")[1])
)
value = minmod._bytestringToFloat(registerstring)
except ValueError as e:
print(e)
writestring += ("{}").format(value)
writestring += "\n"
print(writestring)
time.sleep(5)
def _genericCommand(self, functioncode, registeraddress, value=None, \
numberOfDecimals=0, numberOfRegisters=1, signed=False, payloadformat=None):
"""Generic command for reading and writing registers and bits.
Args:
* functioncode (int): Modbus function code.
* registeraddress (int): The register address (use decimal numbers, not hex).
* value (numerical or string or None or list of int): The value to store in the register. Depends on payloadformat.
* numberOfDecimals (int): The number of decimals for content conversion. Only for a single register.
* numberOfRegisters (int): The number of registers to read/write. Only certain values allowed, depends on payloadformat.
* signed (bool): Whether the data should be interpreted as unsigned or signed. Only for a single register or for payloadformat='long'.
* payloadformat (None or string): None, 'long', 'float', 'string', 'register', 'registers'. Not necessary for single registers or bits.
If a value of 77.0 is stored internally in the slave register as 770,
then use ``numberOfDecimals=1`` which will divide the received data from the slave by 10
before returning the value. Similarly ``numberOfDecimals=2`` will divide
the received data by 100 before returning the value. Same functionality is also used
when writing data to the slave.
Returns:
The register data in numerical value (int or float), or the bit value 0 or 1 (int), or ``None``.
Raises:
ValueError, TypeError, IOError
"""
NUMBER_OF_BITS = 1
NUMBER_OF_BYTES_FOR_ONE_BIT = 1
NUMBER_OF_BYTES_BEFORE_REGISTERDATA = 1
ALL_ALLOWED_FUNCTIONCODES = list(range(
1, 7)) + [15, 16] + [22] # To comply with both Python2 and Python3
MAX_NUMBER_OF_REGISTERS = 255
# Payload format constants, so datatypes can be told apart.
# Note that bit datatype not is included, because it uses other functioncodes.
PAYLOADFORMAT_LONG = 'long'
PAYLOADFORMAT_FLOAT = 'float'
PAYLOADFORMAT_STRING = 'string'
PAYLOADFORMAT_REGISTER = 'register'
PAYLOADFORMAT_REGISTERS = 'registers'
ALL_PAYLOADFORMATS = [PAYLOADFORMAT_LONG, PAYLOADFORMAT_FLOAT, \
PAYLOADFORMAT_STRING, PAYLOADFORMAT_REGISTER, PAYLOADFORMAT_REGISTERS]
## Check input values ##
minimalmodbus._checkFunctioncode(
functioncode, ALL_ALLOWED_FUNCTIONCODES
) # Note: The calling facade functions should validate this
minimalmodbus._checkRegisteraddress(registeraddress)
minimalmodbus._checkInt(numberOfDecimals,
minvalue=0,
description='number of decimals')
minimalmodbus._checkInt(numberOfRegisters,
minvalue=1,
maxvalue=MAX_NUMBER_OF_REGISTERS,
description='number of registers')
minimalmodbus._checkBool(signed, description='signed')
if payloadformat is not None:
if payloadformat not in ALL_PAYLOADFORMATS:
raise ValueError(
'Wrong payload format variable. Given: {0!r}'.format(
payloadformat))
## Check combinations of input parameters ##
numberOfRegisterBytes = numberOfRegisters * _NUMBER_OF_BYTES_PER_REGISTER
# Payload format
if functioncode in [3, 4, 6, 16] and payloadformat is None:
payloadformat = PAYLOADFORMAT_REGISTER
if functioncode in [3, 4, 6, 16]:
if payloadformat not in ALL_PAYLOADFORMATS:
raise ValueError('The payload format is unknown. Given format: {0!r}, functioncode: {1!r}.'.\
format(payloadformat, functioncode))
else:
if payloadformat is not None:
raise ValueError('The payload format given is not allowed for this function code. ' + \
'Given format: {0!r}, functioncode: {1!r}.'.format(payloadformat, functioncode))
# Signed and numberOfDecimals
if signed:
if payloadformat not in [
PAYLOADFORMAT_REGISTER, PAYLOADFORMAT_LONG
]:
raise ValueError('The "signed" parameter can not be used for this data format. ' + \
'Given format: {0!r}.'.format(payloadformat))
if numberOfDecimals > 0 and payloadformat != PAYLOADFORMAT_REGISTER:
raise ValueError('The "numberOfDecimals" parameter can not be used for this data format. ' + \
'Given format: {0!r}.'.format(payloadformat))
# Number of registers
if functioncode not in [3, 4, 16] and numberOfRegisters != 1:
raise ValueError('The numberOfRegisters is not valid for this function code. ' + \
'NumberOfRegisters: {0!r}, functioncode {1}.'.format(numberOfRegisters, functioncode))
if functioncode == 16 and payloadformat == PAYLOADFORMAT_REGISTER and numberOfRegisters != 1:
raise ValueError('Wrong numberOfRegisters when writing to a ' + \
'single register. Given {0!r}.'.format(numberOfRegisters))
# Note: For function code 16 there is checking also in the content conversion functions.
# Value
if functioncode in [5, 6, 15, 16, 22] and value is None:
raise ValueError('The input value is not valid for this function code. ' + \
'Given {0!r} and {1}.'.format(value, functioncode))
if functioncode == 16 and payloadformat in [
PAYLOADFORMAT_REGISTER, PAYLOADFORMAT_FLOAT, PAYLOADFORMAT_LONG
]:
minimalmodbus._checkNumerical(value, description='input value')
if functioncode == 6 and payloadformat == PAYLOADFORMAT_REGISTER:
minimalmodbus._checkNumerical(value, description='input value')
# Value for string
if functioncode == 16 and payloadformat == PAYLOADFORMAT_STRING:
minimalmodbus._checkString(value,
'input string',
minlength=1,
maxlength=numberOfRegisterBytes)
# Note: The string might be padded later, so the length might be shorter than numberOfRegisterBytes.
# Value for registers
if functioncode == 16 and payloadformat == PAYLOADFORMAT_REGISTERS:
if not isinstance(value, list):
raise TypeError(
'The value parameter must be a list. Given {0!r}.'.format(
value))
if len(value) != numberOfRegisters:
raise ValueError('The list length does not match number of registers. ' + \
'List: {0!r}, Number of registers: {1!r}.'.format(value, numberOfRegisters))
## Build payload to slave ##
if functioncode in [1, 2]:
payloadToSlave = minimalmodbus._numToTwoByteString(registeraddress) + \
minimalmodbus._numToTwoByteString(NUMBER_OF_BITS)
elif functioncode in [3, 4]:
payloadToSlave = minimalmodbus._numToTwoByteString(registeraddress) + \
minimalmodbus._numToTwoByteString(numberOfRegisters)
elif functioncode == 5:
payloadToSlave = minimalmodbus._numToTwoByteString(registeraddress) + \
minimalmodbus._createBitpattern(functioncode, value)
elif functioncode == 6:
payloadToSlave = minimalmodbus._numToTwoByteString(registeraddress) + \
minimalmodbus._numToTwoByteString(value, numberOfDecimals, signed=signed)
elif functioncode == 15:
payloadToSlave = minimalmodbus._numToTwoByteString(registeraddress) + \
minimalmodbus._numToTwoByteString(NUMBER_OF_BITS) + \
minimalmodbus._numToOneByteString(NUMBER_OF_BYTES_FOR_ONE_BIT) + \
minimalmodbus._createBitpattern(functioncode, value)
elif functioncode == 16:
if payloadformat == PAYLOADFORMAT_REGISTER:
registerdata = minimalmodbus._numToTwoByteString(
value, numberOfDecimals, signed=signed)
elif payloadformat == PAYLOADFORMAT_STRING:
registerdata = minimalmodbus._textstringToBytestring(
value, numberOfRegisters)
elif payloadformat == PAYLOADFORMAT_LONG:
registerdata = minimalmodbus._longToBytestring(
value, signed, numberOfRegisters)
elif payloadformat == PAYLOADFORMAT_FLOAT:
registerdata = minimalmodbus._floatToBytestring(
value, numberOfRegisters)
elif payloadformat == PAYLOADFORMAT_REGISTERS:
registerdata = minimalmodbus._valuelistToBytestring(
value, numberOfRegisters)
assert len(registerdata) == numberOfRegisterBytes
payloadToSlave = minimalmodbus._numToTwoByteString(registeraddress) + \
minimalmodbus._numToTwoByteString(numberOfRegisters) + \
minimalmodbus._numToOneByteString(numberOfRegisterBytes) + \
registerdata
elif functioncode == 22:
registerdata = minimalmodbus._valuelistToBytestring(value, 2)
payloadToSlave = minimalmodbus._numToTwoByteString(registeraddress) + \
registerdata
## Communicate ##
payloadFromSlave = self._performCommand(functioncode, payloadToSlave)
## Check the contents in the response payload ##
if functioncode in [1, 2, 3, 4]:
minimalmodbus._checkResponseByteCount(
payloadFromSlave) # response byte count
if functioncode in [5, 6, 15, 16]:
minimalmodbus._checkResponseRegisterAddress(
payloadFromSlave, registeraddress) # response register address
if functioncode == 5:
minimalmodbus._checkResponseWriteData(
payloadFromSlave,
minimalmodbus._createBitpattern(functioncode,
value)) # response write data
if functioncode == 6:
minimalmodbus._checkResponseWriteData(payloadFromSlave, \
minimalmodbus._numToTwoByteString(value, numberOfDecimals, signed=signed)) # response write data
if functioncode == 15:
minimalmodbus._checkResponseNumberOfRegisters(
payloadFromSlave, NUMBER_OF_BITS) # response number of bits
if functioncode == 16:
minimalmodbus._checkResponseNumberOfRegisters(
payloadFromSlave,
numberOfRegisters) # response number of registers
## Calculate return value ##
if functioncode in [1, 2]:
registerdata = payloadFromSlave[
NUMBER_OF_BYTES_BEFORE_REGISTERDATA:]
if len(registerdata) != NUMBER_OF_BYTES_FOR_ONE_BIT:
raise ValueError('The registerdata length does not match NUMBER_OF_BYTES_FOR_ONE_BIT. ' + \
'Given {0}.'.format(len(registerdata)))
return minimalmodbus._bitResponseToValue(registerdata)
if functioncode in [3, 4]:
registerdata = payloadFromSlave[
NUMBER_OF_BYTES_BEFORE_REGISTERDATA:]
if len(registerdata) != numberOfRegisterBytes:
raise ValueError('The registerdata length does not match number of register bytes. ' + \
'Given {0!r} and {1!r}.'.format(len(registerdata), numberOfRegisterBytes))
if payloadformat == PAYLOADFORMAT_STRING:
return minimalmodbus._bytestringToTextstring(
registerdata, numberOfRegisters)
elif payloadformat == PAYLOADFORMAT_LONG:
return minimalmodbus._bytestringToLong(registerdata, signed,
numberOfRegisters)
elif payloadformat == PAYLOADFORMAT_FLOAT:
return minimalmodbus._bytestringToFloat(
registerdata, numberOfRegisters)
elif payloadformat == PAYLOADFORMAT_REGISTERS:
return minimalmodbus._bytestringToValuelist(
registerdata, numberOfRegisters)
elif payloadformat == PAYLOADFORMAT_REGISTER:
return minimalmodbus._twoByteStringToNum(registerdata,
numberOfDecimals,
signed=signed)
raise ValueError('Wrong payloadformat for return value generation. ' + \
'Given {0}'.format(payloadformat))
if functioncode == 22:
registerdata = payloadFromSlave[
NUMBER_OF_BYTES_BEFORE_REGISTERDATA:]
return ("OK")
if register['only'] == "" or register['only'] == channel[
'type']:
if register['float'] != "NA":
try:
#value = instrument.read_float(register['float'])
values = instrument.read_registers(
register['float'], numberOfRegisters=2)
registerstring = chr(values[1].to_bytes(
2, byteorder='big')[0]) + chr(
values[1].to_bytes(
2, byteorder='big')[1]) + chr(
values[0].to_bytes(
2, byteorder='big')[0]) + chr(
values[1].to_bytes(
2, byteorder='big')[1])
value = minmod._bytestringToFloat(
registerstring) * register['convert']
except ValueError as e:
print(e)
print("Value: {}".format(value))
writestring += ("{}").format(value)
headerstring += "\n"
unitstring += "\n"
writestring += "\n"
print(writestring)
if d.hour < mod['savetime']:
datafilepath = monthpath + ("{}-{}-{}+{}hr.csv").format(
d.year, d.month, d.day - 1, mod['savetime'])
else:
filename = '/home/pi/energy' + str(time.strftime('%m-%d-%Y')) + '.csv'
f = open(filename, 'a')
for x in range(len(addrname)):
f.write(str(addrname[x]))
f.write(',')
f.write('\n')
f.close()
next_rec_time = round(time.time() + delay)
try:
for x in range(len(addr)):
temp = instrument.read_registers(addr[x], numberOfRegisters=2)
#print temp
regStr = chr(temp[1] >> 8) + chr(temp[1] & 0x00FF) + chr(
temp[0] >> 8) + chr(temp[0] & 0x00FF)
#print regStr
flt = minimalmodbus._bytestringToFloat(regStr)
res[x] = flt
f = open(filename, 'a')
f.write(str(time.strftime('%m-%d-%Y %H:%M:%S')) + ',')
for x in range(len(addr)):
f.write(str(res[x]))
f.write(',')
f.write('\n')
f.close()
i = i + 1
print(i)
except:
res = [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]
f = open(filename, 'a')
f.write(str(time.strftime('%m-%d-%Y %H:%M:%S')) + ',')
for x in range(len(addr)):
def convert_MODbus_to_standard_float(self, a):
if len(a) != 2:
raise Exception('INVALID input')
b = [a[1], a[0]]
return minimalmodbus._bytestringToFloat("".join(
[minimalmodbus._numToTwoByteString(i) for i in b]))
