![]() ![]() isError ()) # test that we are not an error resp = * 21 # If the returned output quantity is not a multiple of eight, # the remaining bits in the final data byte will be padded with zeros # (toward the high order end of the byte). isError ()) # test that we are not an error assert ( not rr. read_coils ( 1, 21, unit = UNIT ) assert ( not rq. ![]() write_coils ( 1, * 8, unit = UNIT ) rr = client. debug ( "Write to multiple coils and read back- test 1" ) rq = client. bits = True ) # test the expected value log. isError ()) # test that we are not an error assert ( rr. read_coils ( 0, 1, unit = UNIT ) assert ( not rq. write_coil ( 0, True, unit = UNIT ) rr = client. debug ( "Write to a Coil and read back" ) rq = client. # Keep both of these cases in mind when testing as the following will # _only_ pass with the supplied asynchronous modbus server (script supplied). Furthermore, some use the same memory # blocks for the two sets, so a change to one is a change to the other. Note that some modbus # implementations differentiate holding/input discrete/coils and as such # you will not be able to write to these, therefore the starting values # are not known to these tests. An example session # is displayed below along with some assert checks. debug ( rr ) # - # example requests # - # simply call the methods that you would like to use. This can be done by specifying the `unit` parameter # which defaults to `0x00` # - # log. connect () # -# specify slave to query # -# The slave to query is specified in an optional parameter for each # individual request. # Setting this to False would disable the inter char timeout # restriction (t1.5) for Modbus RTU # Here is an example of using these options:: # client = ModbusClient('localhost', retries=3, retry_on_empty=True) # -# client = ModbusClient ( 'localhost', port = 5020 ) # from ansaction import ModbusRtuFramer # client = ModbusClient('localhost', port=5020, framer=ModbusRtuFramer) # client = ModbusClient(method='binary', port='/dev/ptyp0', timeout=1) # client = ModbusClient(method='ascii', port='/dev/ptyp0', timeout=1) # client = ModbusClient(method='rtu', port='/dev/ptyp0', timeout=1, # baudrate=9600) client. # Adheres to modbus protocol for timing restrictions # (default = True). The current ones are: # * retries - Specify how many retries to allow per transaction (default=3) # * retry_on_empty - Is an empty response a retry (default = False) # * source_address - Specifies the TCP source address to bind to # * strict - Applicable only for Modbus RTU clients. # There are also other options that can be set on the client that controls # how transactions are performed. By default they use # the socket framer:: # client = ModbusClient('localhost', port=5020, framer=ModbusRtuFramer) # It should be noted that you can supply an ipv4 or an ipv6 host address # for both the UDP and TCP clients. ![]() # If you use the UDP or TCP clients, you can override the framer being used # to use a custom implementation (say RTU over TCP). For this # you can use an existing device, the reference implementation in the tools # directory, or start a pymodbus server. DEBUG ) UNIT = 0x1 def run_sync_client (): # -# choose the client you want # -# make sure to start an implementation to hit against. basicConfig ( format = FORMAT ) log = logging. It should be noted that the client can also be used with the guard construct that is available in python 2.5 and up:: with ModbusClient('127.0.0.1') as client: result = client.read_coils(1,10) print result """ # - # import the various client implementations # - # from import ModbusTcpClient as ModbusClient # from import ModbusUdpClient as ModbusClient # from import ModbusSerialClient as ModbusClient # - # configure the client logging # - # import logging FORMAT = ( ' %(asctime)-15s %(threadName)-15s ' ' %(levelname)-8s %(module)-15s : %(lineno)-8s %(message)s ' ) logging. ![]() Megatune settings for multiple coil how to##!/usr/bin/env python """ Pymodbus Synchronous Client Examples - The following is an example of how to use the synchronous modbus client implementation from pymodbus. Megatune settings for multiple coil serial#Asynchronous Asyncio Serial Client Example. ![]()
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