PyModbus Updating Server can't write or read registers










0















I am using this exakt example: https://pymodbus.readthedocs.io/en/v2.1.0/source/example/updating_server.html except changing 'localhost' to the IP adress of the Raspberrypi the program is running on.



The server is up and running, and I can connect to my windows client software (QModMaster).
The code adds "1" to the registers up every 5 seconds.
I tried to read every register (Holding, Coils, Input, Discrete), but I always get the same starting value, "17".
Here's what the shell puts out:



RESTART: /home/pi/Documents/Tests/PythonModbus/pymodbus-master/examples/common/TestUpdatingserver.py
INFO:pymodbus.server.async:Starting Modbus TCP Server on 10.21.39.27:5020
DEBUG:pymodbus.server.async:Running in Main thread
DEBUG:pymodbus.server.async:Client Connected [IPv4Address(type='TCP', host='10.21.39.27', port=5020)]
DEBUG:root:updating the context
DEBUG:pymodbus.datastore.context:getValues[3] 17:5
DEBUG:root:new values: [18, 18, 18, 18, 18]
DEBUG:pymodbus.datastore.context:setValues[3] 17:5
DEBUG:root:updating the context
DEBUG:pymodbus.datastore.context:getValues[3] 17:5
DEBUG:root:new values: [19, 19, 19, 19, 19]
DEBUG:pymodbus.datastore.context:setValues[3] 17:5
DEBUG:pymodbus.server.async:Data Received: 0x0 0x1 0x0 0x0 0x0 0x6 0x1 0x3 0x0 0x0 0x0 0x5
DEBUG:pymodbus.framer.socket_framer:Processing: 0x0 0x1 0x0 0x0 0x0 0x6 0x1 0x3 0x0 0x0 0x0 0x5
DEBUG:pymodbus.factory:Factory Request[3]
DEBUG:pymodbus.datastore.context:validate[3] 1:5
DEBUG:pymodbus.datastore.context:getValues[3] 1:5
DEBUG:pymodbus.server.async:send: b'00010000000d01030a00110011001100110011'
DEBUG:root:updating the context
DEBUG:pymodbus.datastore.context:getValues[3] 17:5
DEBUG:root:new values: [20, 20, 20, 20, 20]
DEBUG:pymodbus.datastore.context:setValues[3] 17:5


and so on....



Could anybody help me or tell me where/in which registers the program writes the values and how I can properly write/read holding registers?



I think it has something to do with this block of code under the updating_writer function from the example, especially with register = 3, but I cannot really grasp what it does. I started diving into the logging module, but It I found it to be a little too complex for me as a beginner:



log.debug("updating the context")
context = a[0]
register = 3
slave_id = 0x00
address = 0x10
values = context[slave_id].getValues(register, address, count=5)
values = [v + 1 for v in values]
log.debug("new values: " + str(values))
context[slave_id].setValues(register, address, values)


Any help is appreciated!






python server client cpu-registers pymodbus







share|improve this question






















  • If you want to read a register from a modbus-slave device, you should use the ModbusTcpClient. Look at here.

    – Benyamin Jafari
    Nov 18 '18 at 7:50















0















I am using this exakt example: https://pymodbus.readthedocs.io/en/v2.1.0/source/example/updating_server.html except changing 'localhost' to the IP adress of the Raspberrypi the program is running on.



The server is up and running, and I can connect to my windows client software (QModMaster).
The code adds "1" to the registers up every 5 seconds.
I tried to read every register (Holding, Coils, Input, Discrete), but I always get the same starting value, "17".
Here's what the shell puts out:



RESTART: /home/pi/Documents/Tests/PythonModbus/pymodbus-master/examples/common/TestUpdatingserver.py
INFO:pymodbus.server.async:Starting Modbus TCP Server on 10.21.39.27:5020
DEBUG:pymodbus.server.async:Running in Main thread
DEBUG:pymodbus.server.async:Client Connected [IPv4Address(type='TCP', host='10.21.39.27', port=5020)]
DEBUG:root:updating the context
DEBUG:pymodbus.datastore.context:getValues[3] 17:5
DEBUG:root:new values: [18, 18, 18, 18, 18]
DEBUG:pymodbus.datastore.context:setValues[3] 17:5
DEBUG:root:updating the context
DEBUG:pymodbus.datastore.context:getValues[3] 17:5
DEBUG:root:new values: [19, 19, 19, 19, 19]
DEBUG:pymodbus.datastore.context:setValues[3] 17:5
DEBUG:pymodbus.server.async:Data Received: 0x0 0x1 0x0 0x0 0x0 0x6 0x1 0x3 0x0 0x0 0x0 0x5
DEBUG:pymodbus.framer.socket_framer:Processing: 0x0 0x1 0x0 0x0 0x0 0x6 0x1 0x3 0x0 0x0 0x0 0x5
DEBUG:pymodbus.factory:Factory Request[3]
DEBUG:pymodbus.datastore.context:validate[3] 1:5
DEBUG:pymodbus.datastore.context:getValues[3] 1:5
DEBUG:pymodbus.server.async:send: b'00010000000d01030a00110011001100110011'
DEBUG:root:updating the context
DEBUG:pymodbus.datastore.context:getValues[3] 17:5
DEBUG:root:new values: [20, 20, 20, 20, 20]
DEBUG:pymodbus.datastore.context:setValues[3] 17:5


and so on....



Could anybody help me or tell me where/in which registers the program writes the values and how I can properly write/read holding registers?



I think it has something to do with this block of code under the updating_writer function from the example, especially with register = 3, but I cannot really grasp what it does. I started diving into the logging module, but It I found it to be a little too complex for me as a beginner:



log.debug("updating the context")
context = a[0]
register = 3
slave_id = 0x00
address = 0x10
values = context[slave_id].getValues(register, address, count=5)
values = [v + 1 for v in values]
log.debug("new values: " + str(values))
context[slave_id].setValues(register, address, values)


Any help is appreciated!






python server client cpu-registers pymodbus







share|improve this question






















  • If you want to read a register from a modbus-slave device, you should use the ModbusTcpClient. Look at here.

    – Benyamin Jafari
    Nov 18 '18 at 7:50













0












0








0


1






I am using this exakt example: https://pymodbus.readthedocs.io/en/v2.1.0/source/example/updating_server.html except changing 'localhost' to the IP adress of the Raspberrypi the program is running on.



The server is up and running, and I can connect to my windows client software (QModMaster).
The code adds "1" to the registers up every 5 seconds.
I tried to read every register (Holding, Coils, Input, Discrete), but I always get the same starting value, "17".
Here's what the shell puts out:



RESTART: /home/pi/Documents/Tests/PythonModbus/pymodbus-master/examples/common/TestUpdatingserver.py
INFO:pymodbus.server.async:Starting Modbus TCP Server on 10.21.39.27:5020
DEBUG:pymodbus.server.async:Running in Main thread
DEBUG:pymodbus.server.async:Client Connected [IPv4Address(type='TCP', host='10.21.39.27', port=5020)]
DEBUG:root:updating the context
DEBUG:pymodbus.datastore.context:getValues[3] 17:5
DEBUG:root:new values: [18, 18, 18, 18, 18]
DEBUG:pymodbus.datastore.context:setValues[3] 17:5
DEBUG:root:updating the context
DEBUG:pymodbus.datastore.context:getValues[3] 17:5
DEBUG:root:new values: [19, 19, 19, 19, 19]
DEBUG:pymodbus.datastore.context:setValues[3] 17:5
DEBUG:pymodbus.server.async:Data Received: 0x0 0x1 0x0 0x0 0x0 0x6 0x1 0x3 0x0 0x0 0x0 0x5
DEBUG:pymodbus.framer.socket_framer:Processing: 0x0 0x1 0x0 0x0 0x0 0x6 0x1 0x3 0x0 0x0 0x0 0x5
DEBUG:pymodbus.factory:Factory Request[3]
DEBUG:pymodbus.datastore.context:validate[3] 1:5
DEBUG:pymodbus.datastore.context:getValues[3] 1:5
DEBUG:pymodbus.server.async:send: b'00010000000d01030a00110011001100110011'
DEBUG:root:updating the context
DEBUG:pymodbus.datastore.context:getValues[3] 17:5
DEBUG:root:new values: [20, 20, 20, 20, 20]
DEBUG:pymodbus.datastore.context:setValues[3] 17:5


and so on....



Could anybody help me or tell me where/in which registers the program writes the values and how I can properly write/read holding registers?



I think it has something to do with this block of code under the updating_writer function from the example, especially with register = 3, but I cannot really grasp what it does. I started diving into the logging module, but It I found it to be a little too complex for me as a beginner:



log.debug("updating the context")
context = a[0]
register = 3
slave_id = 0x00
address = 0x10
values = context[slave_id].getValues(register, address, count=5)
values = [v + 1 for v in values]
log.debug("new values: " + str(values))
context[slave_id].setValues(register, address, values)


Any help is appreciated!






python server client cpu-registers pymodbus







share|improve this question














I am using this exakt example: https://pymodbus.readthedocs.io/en/v2.1.0/source/example/updating_server.html except changing 'localhost' to the IP adress of the Raspberrypi the program is running on.



The server is up and running, and I can connect to my windows client software (QModMaster).
The code adds "1" to the registers up every 5 seconds.
I tried to read every register (Holding, Coils, Input, Discrete), but I always get the same starting value, "17".
Here's what the shell puts out:



RESTART: /home/pi/Documents/Tests/PythonModbus/pymodbus-master/examples/common/TestUpdatingserver.py
INFO:pymodbus.server.async:Starting Modbus TCP Server on 10.21.39.27:5020
DEBUG:pymodbus.server.async:Running in Main thread
DEBUG:pymodbus.server.async:Client Connected [IPv4Address(type='TCP', host='10.21.39.27', port=5020)]
DEBUG:root:updating the context
DEBUG:pymodbus.datastore.context:getValues[3] 17:5
DEBUG:root:new values: [18, 18, 18, 18, 18]
DEBUG:pymodbus.datastore.context:setValues[3] 17:5
DEBUG:root:updating the context
DEBUG:pymodbus.datastore.context:getValues[3] 17:5
DEBUG:root:new values: [19, 19, 19, 19, 19]
DEBUG:pymodbus.datastore.context:setValues[3] 17:5
DEBUG:pymodbus.server.async:Data Received: 0x0 0x1 0x0 0x0 0x0 0x6 0x1 0x3 0x0 0x0 0x0 0x5
DEBUG:pymodbus.framer.socket_framer:Processing: 0x0 0x1 0x0 0x0 0x0 0x6 0x1 0x3 0x0 0x0 0x0 0x5
DEBUG:pymodbus.factory:Factory Request[3]
DEBUG:pymodbus.datastore.context:validate[3] 1:5
DEBUG:pymodbus.datastore.context:getValues[3] 1:5
DEBUG:pymodbus.server.async:send: b'00010000000d01030a00110011001100110011'
DEBUG:root:updating the context
DEBUG:pymodbus.datastore.context:getValues[3] 17:5
DEBUG:root:new values: [20, 20, 20, 20, 20]
DEBUG:pymodbus.datastore.context:setValues[3] 17:5


and so on....



Could anybody help me or tell me where/in which registers the program writes the values and how I can properly write/read holding registers?



I think it has something to do with this block of code under the updating_writer function from the example, especially with register = 3, but I cannot really grasp what it does. I started diving into the logging module, but It I found it to be a little too complex for me as a beginner:



log.debug("updating the context")
context = a[0]
register = 3
slave_id = 0x00
address = 0x10
values = context[slave_id].getValues(register, address, count=5)
values = [v + 1 for v in values]
log.debug("new values: " + str(values))
context[slave_id].setValues(register, address, values)


Any help is appreciated!






python server client cpu-registers pymodbus




python server client cpu-registers pymodbus






share|improve this question













share|improve this question











share|improve this question




share|improve this question










asked Nov 14 '18 at 10:17









j.frankj.frank

1




1












  • If you want to read a register from a modbus-slave device, you should use the ModbusTcpClient. Look at here.

    – Benyamin Jafari
    Nov 18 '18 at 7:50

















  • If you want to read a register from a modbus-slave device, you should use the ModbusTcpClient. Look at here.

    – Benyamin Jafari
    Nov 18 '18 at 7:50
















If you want to read a register from a modbus-slave device, you should use the ModbusTcpClient. Look at here.

– Benyamin Jafari
Nov 18 '18 at 7:50





If you want to read a register from a modbus-slave device, you should use the ModbusTcpClient. Look at here.

– Benyamin Jafari
Nov 18 '18 at 7:50












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