Node-RED version : v.0.15.3
Hello to everybody,
Beginner in Nodered, I am currently working on a Modbus data acquisition system with Nodered.
First of all, I managed to get the address of a counter, and to build a modbus frame according to the Modbus protocol (RS485).
Secondly, I managed to display on the debug the values of the modbus frame and to display them.
I would like to be able to recover the payload object that it sends us (the multi serial) in a table.
I wanna be able to cut and keep only the values between the brackets and delete the rest (here my registers refer to the kwH) (Screen below). And then allow to convert the hexadecimal values of the frame into decimal on the display tab
Does anyone know how to do this? And is it possible to create a global variable?
Excuse me, I think that my "fonction de test" node must contain a lot of errors.
Here is my flow code :
[{"id":"c2d776a2.9ebe68","type":"tab","label":"Node TEST"},{"id":"1d132f6a.05eaa1","type":"function","z":"c2d776a2.9ebe68","name":"write trame","func":"var buf=Buffer([0x02,0x03,0xC6,0x52,0x00,0x02,0x59,0x61]);\nmsg.payload=buf;\nreturn msg;\n","outputs":1,"noerr":0,"x":408,"y":194,"wires":[["a06d32f3.fd2b2","9b3b4bb1.74b2b8"]]},{"id":"44ec0cf0.b63024","type":"inject","z":"c2d776a2.9ebe68","name":"payload","topic":"","payload":"","payloadType":"str","repeat":"","crontab":"","once":false,"x":150,"y":195,"wires":[["1d132f6a.05eaa1"]]},{"id":"95fea1ef.6353b","type":"debug","z":"c2d776a2.9ebe68","name":"","active":true,"console":"false","complete":"true","x":744,"y":423,"wires":[]},{"id":"a06d32f3.fd2b2","type":"debug","z":"c2d776a2.9ebe68","name":"","active":true,"console":"false","complete":"payload","x":746,"y":194,"wires":[]},{"id":"a05ecf98.bcd35","type":"multi serial in","z":"c2d776a2.9ebe68","name":"","accessoryport":"2","mode":"rs485hd","serialbaud":"9600","datatype":"readbytes","flowcontrol":"disabled","xonxoff":null,"rtscts":null,"dsrdtr":null,"startstopchars":"false","databits":8,"stopbits":1,"timeout":"1","bytecount":"1","parity":"none","x":136.10000610351562,"y":420,"wires":[["95fea1ef.6353b"]]},{"id":"9b3b4bb1.74b2b8","type":"multi serial out","z":"c2d776a2.9ebe68","name":"","accessoryport":"2","mode":"rs485hd","serialbaud":"9600","datatype":"readbytes","flowcontrol":"disabled","xonxoff":null,"rtscts":null,"dsrdtr":null,"startstopchars":"false","databits":8,"stopbits":1,"parity":"none","x":742.1000747680664,"y":326.0000066757202,"wires":[]},{"id":"2990e6d1.4bf94a","type":"function","z":"c2d776a2.9ebe68","name":"fonction test","func":"var count=global.get('msg.payload') || 0;\nvar payload=context.get('msg.payload') || {};\nif (payload.count===undefined)//test exists\n{\n payload.count=0;\n}\npayload.count +=1;\nglobal.set('msg.payload',count);\nmsg.payload=\"msg.payload \"+msg.payload+\" \"+payload.count;\ncontext.set('msg.payload',payload);\nreturn msg.payload;\n\n\n//var payload=msg.payload;\n//var trame = {};\n/*global.set(\"Message Payload\",msgpayload);\nmsg.payload = global.get(\"payload\");\n\nreturn msg;\n*/","outputs":1,"noerr":0,"x":350.16668701171875,"y":492.3333740234375,"wires":[[]]},{"id":"834f70a2.655b","type":"function","z":"c2d776a2.9ebe68","name":"","func":"return payload;","outputs":1,"noerr":0,"x":451,"y":366,"wires":[[]]}]
