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Unable to poll data using node-red on iot2050

Created by: VPNVu0234 at: 1/10/2023 3:26 PM (5 Replies)

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1/10/2023 3:26 PM	Rate (0)
VPNVu0234 Member Joined: 8/5/2022 Last visit: 5/6/2023 Posts: 4 Rating: (0)	Hi, I am working on a student project involve using iot2050 and Node-red to poll data. So I connected my laptop to the iot2050 with an ethernet cable.I try to poll some number from a slave simulation program ( Modbus Slave) on my lap with a simple flow but it did not work. My flow: [{"id":"4b33b8e7.cd2418","type":"tab","label":"TEST 2","disabled":false,"info":""},{"id":"761d864e.aa0488","type":"inject","z":"4b33b8e7.cd2418","name":"","props":[{"p":"payload"},{"p":"topic","vt":"str"}],"repeat":"1","crontab":"","once":false,"onceDelay":0.1,"topic":"","payload":"","payloadType":"date","x":170,"y":180,"wires":[["ec566e06.f820d"]]},{"id":"2cc1b935.4b8ff6","type":"modbus-flex-getter","z":"4b33b8e7.cd2418","name":"","showStatusActivities":false,"showErrors":false,"logIOActivities":false,"server":"659784ca.45dbcc","useIOFile":false,"ioFile":"","useIOForPayload":false,"emptyMsgOnFail":false,"keepMsgProperties":false,"x":450,"y":180,"wires":[["c3e59b32.af2cb8"],["2d01a806.3793f8"]]},{"id":"c3e59b32.af2cb8","type":"modbus-response","z":"4b33b8e7.cd2418","name":"","registerShowMax":20,"x":690,"y":160,"wires":[]},{"id":"ec566e06.f820d","type":"function","z":"4b33b8e7.cd2418","name":"function 1","func":"msg.payload = { \n 'fc': 3, \n 'unitid': 1, \n 'address': 0, \n 'quantity': 10 } \nreturn msg\n","outputs":1,"noerr":0,"initialize":"","finalize":"","x":280,"y":240,"wires":[["2cc1b935.4b8ff6"]]},{"id":"2d01a806.3793f8","type":"debug","z":"4b33b8e7.cd2418","name":"debug 3","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"payload","targetType":"msg","statusVal":"","statusType":"auto","x":660,"y":220,"wires":[]},{"id":"659784ca.45dbcc","type":"modbus-client","name":"","clienttype":"tcp","bufferCommands":true,"stateLogEnabled":false,"queueLogEnabled":false,"tcpHost":"192.168.200.5","tcpPort":"502","tcpType":"DEFAULT","serialPort":"/dev/ttyUSB","serialType":"RTU-BUFFERD","serialBaudrate":"9600","serialDatabits":"8","serialStopbits":"1","serialParity":"none","serialConnectionDelay":"100","unit_id":"1","commandDelay":"1","clientTimeout":"1000","reconnectOnTimeout":true,"reconnectTimeout":"2000","parallelUnitIdsAllowed":true}] I set my lap ip address to 192.168.200.5 and set Modbus Slave to listen to server 192.168.200.5 port 502. I am very new to iot and Node-red in general so I do not know if the problem is node-red, hardware setup or outside factor. If it is inappropriated to ask such problem here then I apologize. Any help is appreciated. Edit 1: I turned on error msg on the modbus-flex-getter node and in the Debug window, it said: "Error: Client Not Ready To Read At State init". Hope it provides some infomation.
	Last edited by: VPNVu0234 at: 01/10/2023 17:42:30
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1/11/2023 7:39 AM	Rate (0)
bergmanu Platinum Member Joined: 4/28/2015 Last visit: 11/5/2024 Posts: 3345 Rating: (379)	Hi, which tool are you using on your laptop? Would like to try it as well. And you are writing you try to poll data with the IOT2050 from a Modbus Slave on your laptop. In this case the IOT2050 is a slave as well and you need to read data from a Modbus Server. So your laptop needs to simulate a Modbus Server, not a Slave. Or did I misunderstand something? Best regards!
	Not working for IOT2050 support anymore from March 1st, 2024. I really enjoyed the time supporting you! :)
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1/11/2023 9:42 AM	Rate (0)
VPNVu0234 Member Joined: 8/5/2022 Last visit: 5/6/2023 Posts: 4 Rating: (0)	Hi, Thank you for the reply. I was using https://www.modbustools.com/modbus_slave.html as modbus slave simulation. I apologize if my discription is not cleared. My setup is: iot2050 connects to my laptop via port X1-P1. I access the node-red browser on iot2050 from my laptop and create the flow as shown in the post. iot2050 ip is 192.168.200.1, my laptop ethernet port ip is 192.168.200.5, and i was able to ping to my laptop from iot2050 console normally. On my laptop, the modbus slave simulation has connection infomation as followed: Modbus TCP/IP, TCP/IP Server ip 192.168.200.5, port 502. I have prepared some data on the modbus slave. I want to use the modbus-flex-getter node to poll the data from the modbus slave. However, I did not see any data shown in modbus response node, and the modbus-flex-getter node show error message: Error: Client Not Ready To Read At State init. My understanding of modbus is low so I think iot2050 should be the modbus master, but I don't know what role is my laptop in the setup, I thought it should only be the medium of some sort. I think the problem lies in my setup rather than node-red but I dont know how to verify my guess and find the problem. Do you have any suggestions ?
	Last edited by: VPNVu0234 at: 01/11/2023 09:57:15
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1/13/2023 7:31 AM	Rate (0)
bergmanu Platinum Member Joined: 4/28/2015 Last visit: 11/5/2024 Posts: 3345 Rating: (379)	Hi, when you want to read data with the IOT2050, your IOT2050 is the client and you need to read data from a server. But maybe this software can also act as server, I don't really get it. I used ModRSSim as Server some time ago and that worked. Somehow I can't make it work at the moment. Have you already tried to use the Modbus Read node instead of the gatter? This also has a poll function. And did you open the port 502 on your PC? Best regards!
	Not working for IOT2050 support anymore from March 1st, 2024. I really enjoyed the time supporting you! :)
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1/16/2023 6:14 PM	Rate (0)
VPNVu0234 Member Joined: 8/5/2022 Last visit: 5/6/2023 Posts: 4 Rating: (0)	HI, Sorry for the late reply! I have tried using Modbus Read Node, It also gave the same error message as the getter node. I want to try out different modbus sim programs to see if any thing else work. Do you have any suggestion. Sorry if this is a dumb question, but how do I view my laptop port status, also how do you open specific port on laptop. I am using Windows 10 btw. Thanks for the reply!

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1/17/2023 7:43 AM	Rate (0)
bergmanu Platinum Member Joined: 4/28/2015 Last visit: 11/5/2024 Posts: 3345 Rating: (379)	Hi, we will try also some things. Here is an instruction how to open a port in the Windows firewall. EDIT: We used the software pyModSlave and it worked. We were able to read data with the Modbus read node. Best regards!
	Last edited by: bergmanu at: 01/17/2023 10:10:22 Not working for IOT2050 support anymore from March 1st, 2024. I really enjoyed the time supporting you! :)
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