Im trying to communicate Schneider PM1200 energy meter with Node red. There i have used Brainbox US-324 RS485 to USB converter and i have successfully check my path via modscan. As per Schneider data sheet i want to read 3709 Float holding register to Node red. I have tried my best to do that and s…

Yes i have successfully connected this with MODSCAN. Also here i have attached the screen shot with Virtual Serial Port Driver. [image] Here with Modscan [image] Since this is talking with modescan it is clear that i have correctly configured my device parameters. 19.2K,Even,ID1 ,8

In order for data to pass from virtual COM4 to physical COM3 you need to link them (see manage ports tab) then you'll see data passing node-red > com4 > ELTIMA > com3 -> device > com3 > ELTIMA > com4 > node-red

Dear Sir, i think i have linked com 3 and com 4 successfully? [image] I don't know how to allow them. I think here only COM 4 is talking to node red and COM 3 is not yet successfully connected? [image] In com 3 it says Port closed :cold_sweat:

But when i connect to MODSCAN and mean time checking the port data it shows connected. [image]

I use ModBus on extensive and complex networks, always on Tcp / Ip, today I tried for you to connect locally via ModBus-RTU to a Schneider EM3155 analyzer via a USB / RS485 converter, I confirm that the communication works correctly. I'll post code that is working properly because it is field teste…

Hi, at start you mentioned 3709 then I see you read 3907 on modscan with success, please check that you are trying to read right register (3709 or 3907), with Modbus try to read just one register for start ie if you need 3907 and it is without success try 3906 or 3908 then comparing with modbuss…

This is not something wrong with MODSCAN.But with node red modbus reading registors.

maybe NODE-red has no access to your usb/com port where i believe your device is connected to, You mentioned usb-rs485 adapter connected direct to meter right, you proved that your connection is right with modscan, was such setup ever worked for you with diff device before? be sure that nothing ele …

[image] Robsky: up ever worked for you with diff device before? be sure that nothing ele is using this com port while you deploy node-re Yes you are correct. I think i have issues with my node red. i will try uninstall install node red again

Node-RED

Node-RED Forum

Modbus RS485 to USB communication

Industrial

Hasitha_Sudasinghe 29 May 2020 02:37 46

Though i have uninstalled and installed i got no success

Topic		Replies	Views
Debugging - node-red-contrib-modbus - serial RTU General	27	5435	16 April 2021
RS485 Modbus RTU slave to Modbus RTU master data converter General modbus	9	713	24 November 2022
Node-red-contrib-modbus, problem with modbus serie General	24	616	6 December 2023
Raspberry Pi RS485 and MODBUS Read General	6	6641	18 May 2020
Errors in MODBUS RTU communication Industrial modbus	69	6774	10 September 2022

Copyright OpenJS Foundation and Node-RED contributors. All rights reserved. The OpenJS Foundation has registered trademarks and uses trademarks. For a list of trademarks of the OpenJS Foundation, please see our Trademark Policy and Trademark List. Trademarks and logos not indicated on the list of OpenJS Foundation trademarks are trademarks™ or registered® trademarks of their respective holders. Use of them does not imply any affiliation with or endorsement by them.

Modbus RS485 to USB communication

Related topics