Modbus. Need help from experts

2jan · May 4, 2020, 7:45pm

I’m not sure how the IAM module works, but I guess it sends Modbus over TCP so something like this should do it in your configuration.yaml:

modbus:
  name: villavent
  type: tcp
  host: 
  port: 8234

You need to input the IP address of the IAM module and the port number. Once this is set up you need to test it with a sensor. I used this code as an example:

sensor:
  - platform: modbus
    scan_interval: 30
    registers:
      - name: Villavent speed level
        hub: villavent
        slave: 1
        register: 100

The trick is to find the correct registers to use, SystemAir has changed them over time. Register 100 for speed level is for my unit from about 2014, and I got mine from a document called Modbus for residential units. You can also find a document on SystemAir’s webpages with Modbus register overview for newer units.

I found the Modbus integration page ok when I was setting this up.

Krdonner · January 27, 2021, 7:15pm

Hi!

Bumping this thread as I cannot seem to get my modbus integration working. I have the systemair VTR 300 ventilationsystem as some others in this post.

The user manual (https://shop.systemair.com/upload/assets/SYSTEMAIR_IAM_MANUAL_EN_SE_DE_NO_FI_20190429.PDF) says that it should be port 8989 (I have tried 8243 also).
The adapter is put in modbus mode.
But I keep getting connection refused error: Connection to (192.168.xx.xx, 8989) failed: [Errno 111] Connection refused.

This is my configuration.yaml:

modbus:
name: systemair
type: tcp
host: 192.168.xx.xx
port: 8989

Does anyone have a clue on what could be wrong or how I find what might be causing the problem?

Thanks in advance!

moskovskiy82 · January 29, 2021, 2:56pm

Why not run a port scan first?

Krdonner · January 29, 2021, 5:27pm

Thanks for the tip. I ran “netstat -a -n” and can’t see anything that indicates that any device is listening on 8989 or 8243.

Tempo_Trevis · January 29, 2021, 6:15pm

Hi,

Sure it’s not port 502? (typically standard Modbus port)
This was my previous VTR300 config before moving the integration to node-red

modbus:
  - name: VTR300
    type: tcp
    host: !secret vtr300_host
    port: 502
    timeout: 3  #Timeout for slave response in seconds (default=3)
    delay: 3  #Time to sleep in seconds after connecting and before sending messages

Krdonner · January 30, 2021, 8:39am

@Tempo_Trevis I cannot belienve it, it worked! No idea why they say its port 8989 but now I get a connection Thank you, you just made my day!

Tempo_Trevis · January 30, 2021, 9:43am

Glad i worked:)
My experience is that it is common that Modbus documentation has flaws (including the VTR300 modbus adr. list)… Modscan32 is a great tool for checking modbus registers data/values as it gives easy access to check values from many registers at the same time.

Krdonner · January 30, 2021, 1:23pm

Yea strange, shouldn’t be that hard to update the manuals
Just tried Modscan32, works great except the limitations of trial period. Thanks for the tip! Now I’ll just have to get the values to HA.

arve · February 4, 2021, 12:22am

Any joy? I just started exploring this today, trying and failing testing with pymodbus.

If you would share your config, that would be awesome

arve · February 4, 2021, 12:25am

Just found this – looks interesting

Krdonner · February 4, 2021, 2:51pm

Hey! Any luck? I moved over to Node Red and manage to read the registers but Im having a hard time reading the array of data I get in response. Might just move back to good ol’ configuration.yaml and have a go at it with the config from that post

Tempo_Trevis · February 5, 2021, 6:21am

Dont give up on modbus using node red, i saves you for looong yaml files if you are integrating the same features from the unit i’m integrating.
May this helps out as a start? (not possible to paste more code due to the size).

Reading modbus registers (sensors):

[{"id":"c65a5a65.72f3b8","type":"inject","z":"c1e03843.9d14a8","name":"Poll(10s)","props":[{"p":"payload"},{"p":"topic","vt":"str"}],"repeat":"10","crontab":"","once":true,"onceDelay":"10","topic":"","payload":"","payloadType":"date","x":80,"y":580,"wires":[["68a6b029.eb563","705bcad4.194ec4","80d78914.de5d38","1aedba91.04b3f5","b5d6e697.144ba8","f8e6582c.4ec7e8","3a7de46.32ee01c","5ea6e1d2.0b447","219b6a9a.0ed5e6","e6d9f4c7.a48278"]]},{"id":"68a6b029.eb563","type":"function","z":"c1e03843.9d14a8","name":"Modbus read","func":"var fc=3;\nvar sa=1254;\nvar addresses=1;\nvar slave_ip=msg.payload.slave_ip;\n\nmsg.slave_ip=\"192.168.1.30\";\nmsg.payload={value: msg.payload, 'fc': fc, 'unitid': 1, 'address': sa , 'quantity': addresses };\nreturn msg;\n\n","outputs":1,"noerr":0,"initialize":"","finalize":"","x":250,"y":580,"wires":[["84937855.5af778"]]},{"id":"84937855.5af778","type":"modbus-flex-getter","z":"c1e03843.9d14a8","name":"Sensor","showStatusActivities":false,"showErrors":true,"logIOActivities":false,"server":"86a33495.600fd8","useIOFile":false,"ioFile":"","useIOForPayload":false,"emptyMsgOnFail":false,"keepMsgProperties":false,"x":400,"y":580,"wires":[[],["7bd64506.de398c"]],"info":"VTR300 Intern UR"},{"id":"7bd64506.de398c","type":"function","z":"c1e03843.9d14a8","name":"0-5000rpm","func":"var Rpm = msg.payload.data[0];\n\nmsg.payload = Rpm;\nreturn msg;\n","outputs":1,"noerr":0,"initialize":"","finalize":"","x":550,"y":580,"wires":[["e310653.30ff398"]]},{"id":"e310653.30ff398","type":"ha-entity","z":"c1e03843.9d14a8","name":"Vifte Komp. [rpm]","server":"2c4e313e.d0fc5e","version":1,"debugenabled":false,"outputs":1,"entityType":"sensor","config":[{"property":"name","value":"vtr300_vifte_hast_komp_rpm"},{"property":"device_class","value":"power_factor"},{"property":"icon","value":""},{"property":"unit_of_measurement","value":"rpm"}],"state":"payload","stateType":"msg","attributes":[],"resend":false,"outputLocation":"","outputLocationType":"none","inputOverride":"allow","x":810,"y":580,"wires":[[]],"info":"# Utekompensert vifte kompensering:\n0% til 50% pådrags kompensering "},{"id":"705bcad4.194ec4","type":"function","z":"c1e03843.9d14a8","name":"Modbus read","func":"var fc=3;\nvar sa=12102;\nvar addresses=1;\nvar slave_ip=msg.payload.slave_ip;\n\nmsg.slave_ip=\"192.168.1.30\";\nmsg.payload={value: msg.payload, 'fc': fc, 'unitid': 1, 'address': sa , 'quantity': addresses };\nreturn msg;\n\n","outputs":1,"noerr":0,"initialize":"","finalize":"","x":250,"y":620,"wires":[["79fc3ca2.89c304"]]},{"id":"79fc3ca2.89c304","type":"modbus-flex-getter","z":"c1e03843.9d14a8","name":"Sensor","showStatusActivities":false,"showErrors":true,"logIOActivities":false,"server":"86a33495.600fd8","useIOFile":false,"ioFile":"","useIOForPayload":false,"emptyMsgOnFail":false,"keepMsgProperties":false,"x":400,"y":620,"wires":[[],["5627d7d5.1ce3e8"]],"info":"VTR300 Intern UR"},{"id":"5627d7d5.1ce3e8","type":"function","z":"c1e03843.9d14a8","name":"Range -40->80","func":"var Temp_raw = msg.payload.data[0];\nvar Temp_scaled;\n\nif (Temp_raw < 6280) { \n  Temp_scaled = (Temp_raw *0.1);\n}\nelse {\n  Temp_scaled = ((Temp_raw - 65535) *0.1); \n}\n\nmsg.payload = parseFloat((Temp_scaled).toFixed(2));\nreturn msg;","outputs":1,"noerr":0,"initialize":"","finalize":"","x":560,"y":620,"wires":[["8e139b51.6e3fe8"]],"info":"# Engineering range: -40°C -> 50°C\n"},{"id":"1aedba91.04b3f5","type":"function","z":"c1e03843.9d14a8","name":"Modbus read","func":"var fc=3;\nvar sa=12101;\nvar addresses=1;\nvar slave_ip=msg.payload.slave_ip;\n\nmsg.slave_ip=\"192.168.1.30\";\nmsg.payload={value: msg.payload, 'fc': fc, 'unitid': 1, 'address': sa , 'quantity': addresses };\nreturn msg;\n\n","outputs":1,"noerr":0,"initialize":"","finalize":"","x":250,"y":700,"wires":[["8d6ef3f4.328dc"]]},{"id":"8d6ef3f4.328dc","type":"modbus-flex-getter","z":"c1e03843.9d14a8","name":"Sensor","showStatusActivities":false,"showErrors":true,"logIOActivities":false,"server":"86a33495.600fd8","useIOFile":false,"ioFile":"","useIOForPayload":false,"emptyMsgOnFail":false,"keepMsgProperties":false,"x":400,"y":700,"wires":[[],["87791222.6ca83"]],"info":"VTR300 Intern UR"},{"id":"87791222.6ca83","type":"function","z":"c1e03843.9d14a8","name":"Range -40->80","func":"var Temp_raw = msg.payload.data[0];\nvar Temp_scaled;\n\nif (Temp_raw < 6280) { \n  Temp_scaled = (Temp_raw *0.1);\n}\nelse {\n  Temp_scaled = ((Temp_raw - 65535) *0.1); \n}\n\nmsg.payload = parseFloat((Temp_scaled).toFixed(2));\nreturn msg;\n","outputs":1,"noerr":0,"initialize":"","finalize":"","x":560,"y":700,"wires":[["24aa165e.573b2a"]],"info":"# Engineering range: -40°C -> 50°C"},{"id":"24aa165e.573b2a","type":"ha-entity","z":"c1e03843.9d14a8","name":"Inntakstemp. [°C]","server":"2c4e313e.d0fc5e","version":1,"debugenabled":false,"outputs":1,"entityType":"sensor","config":[{"property":"name","value":"vtr300_inntaks_temperatur"},{"property":"device_class","value":"temperature"},{"property":"icon","value":"mdi:thermometer"},{"property":"unit_of_measurement","value":"°C"}],"state":"payload","stateType":"msg","attributes":[],"resend":false,"outputLocation":"","outputLocationType":"none","inputOverride":"allow","x":810,"y":700,"wires":[[]],"info":"# Utekompensert vifte kompensering:\n0% til 50% pådrags kompensering "},{"id":"8e139b51.6e3fe8","type":"ha-entity","z":"c1e03843.9d14a8","name":"Tilluftstemp. [°C]","server":"2c4e313e.d0fc5e","version":1,"debugenabled":false,"outputs":1,"entityType":"sensor","config":[{"property":"name","value":"vtr300_tillufts_temperatur"},{"property":"device_class","value":"temperature"},{"property":"icon","value":"mdi:thermometer"},{"property":"unit_of_measurement","value":"°C"}],"state":"payload","stateType":"msg","attributes":[],"resend":false,"outputLocation":"","outputLocationType":"none","inputOverride":"allow","x":800,"y":620,"wires":[[]],"info":"# Utekompensert vifte kompensering:\n0% til 50% pådrags kompensering "},{"id":"b5d6e697.144ba8","type":"function","z":"c1e03843.9d14a8","name":"Modbus read","func":"var fc=3;\nvar sa=12543;\nvar addresses=1;\nvar slave_ip=msg.payload.slave_ip;\n\nmsg.slave_ip=\"192.168.1.30\";\nmsg.payload={value: msg.payload, 'fc': fc, 'unitid': 1, 'address': sa , 'quantity': addresses };\nreturn msg;\n\n","outputs":1,"noerr":0,"initialize":"","finalize":"","x":250,"y":740,"wires":[["c6d50893.ed54c8"]],"info":"# 2050   NB!EAT/RAT used for extract air controller, benyttes pga. avtrekk AI er \"ekstrautstyr\""},{"id":"c6d50893.ed54c8","type":"modbus-flex-getter","z":"c1e03843.9d14a8","name":"Sensor","showStatusActivities":false,"showErrors":true,"logIOActivities":false,"server":"86a33495.600fd8","useIOFile":false,"ioFile":"","useIOForPayload":false,"emptyMsgOnFail":false,"keepMsgProperties":false,"x":400,"y":740,"wires":[[],["573f9e49.21545"]],"info":"VTR300 Intern UR"},{"id":"573f9e49.21545","type":"function","z":"c1e03843.9d14a8","name":"Range -40->80","func":"var Temp_raw = msg.payload.data[0];\nvar Temp_scaled;\n\nif (Temp_raw < 6280) { \n  Temp_scaled = (Temp_raw *0.1);\n}\nelse {\n  Temp_scaled = ((Temp_raw - 65535) *0.1); \n}\n\nmsg.payload = parseFloat((Temp_scaled).toFixed(2));\nreturn msg;\n","outputs":1,"noerr":0,"initialize":"","finalize":"","x":560,"y":740,"wires":[["8caa3e3a.f515c"]],"info":"# Engineering range: -40°C -> 50°C"},{"id":"8caa3e3a.f515c","type":"ha-entity","z":"c1e03843.9d14a8","name":"Avtrekkstemp. [°C]","server":"2c4e313e.d0fc5e","version":1,"debugenabled":false,"outputs":1,"entityType":"sensor","config":[{"property":"name","value":"vtr300_avtrekks_temperatur"},{"property":"device_class","value":"temperature"},{"property":"icon","value":"mdi:thermometer"},{"property":"unit_of_measurement","value":"°C"}],"state":"payload","stateType":"msg","attributes":[],"resend":false,"outputLocation":"","outputLocationType":"none","inputOverride":"allow","x":810,"y":740,"wires":[[]],"info":"# Utekompensert vifte kompensering:\n0% til 50% pådrags kompensering "},{"id":"80d78914.de5d38","type":"function","z":"c1e03843.9d14a8","name":"Modbus read","func":"var fc=3;\nvar sa=12107;\nvar addresses=1;\nvar slave_ip=msg.payload.slave_ip;\n\nmsg.slave_ip=\"192.168.1.30\";\nmsg.payload={value: msg.payload, 'fc': fc, 'unitid': 1, 'address': sa , 'quantity': addresses };\nreturn msg;\n\n","outputs":1,"noerr":0,"initialize":"","finalize":"","x":250,"y":660,"wires":[["28f35935.b68ff6"]],"info":"# 2050   NB!EAT/RAT used for extract air controller, benyttes pga. avtrekk AI er \"ekstrautstyr\""},{"id":"28f35935.b68ff6","type":"modbus-flex-getter","z":"c1e03843.9d14a8","name":"Sensor","showStatusActivities":false,"showErrors":true,"logIOActivities":false,"server":"86a33495.600fd8","useIOFile":false,"ioFile":"","useIOForPayload":false,"emptyMsgOnFail":false,"keepMsgProperties":false,"x":400,"y":660,"wires":[[],["de46baec.e636e8"]],"info":"VTR300 Intern UR"},{"id":"de46baec.e636e8","type":"function","z":"c1e03843.9d14a8","name":"Range -40->80","func":"var Temp_raw = msg.payload.data[0];\nvar Temp_scaled;\n\nif (Temp_raw < 6280) { \n  Temp_scaled = (Temp_raw *0.1);\n}\nelse {\n  Temp_scaled = ((Temp_raw - 65535) *0.1); \n}\n\nmsg.payload = parseFloat((Temp_scaled).toFixed(2));\nreturn msg;\n","outputs":1,"noerr":0,"initialize":"","finalize":"","x":560,"y":660,"wires":[["17f5ddc3.689502"]],"info":"# Engineering range: -40°C -> 50°C"},{"id":"17f5ddc3.689502","type":"ha-entity","z":"c1e03843.9d14a8","name":"Tilluftstemp. Overhetn. [°C]","server":"2c4e313e.d0fc5e","version":1,"debugenabled":false,"outputs":1,"entityType":"sensor","config":[{"property":"name","value":"vtr300_overhetingstemperatur_tilluft"},{"property":"device_class","value":"temperature"},{"property":"icon","value":"mdi:thermometer"},{"property":"unit_of_measurement","value":"°C"}],"state":"payload","stateType":"msg","attributes":[],"resend":false,"outputLocation":"","outputLocationType":"none","inputOverride":"allow","x":840,"y":660,"wires":[[]],"info":"# Utekompensert vifte kompensering:\n0% til 50% pådrags kompensering "},{"id":"86a33495.600fd8","type":"modbus-client","name":"VTR300","clienttype":"tcp","bufferCommands":true,"stateLogEnabled":false,"queueLogEnabled":false,"tcpHost":"192.168.1.30","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},{"id":"2c4e313e.d0fc5e","type":"server","name":"Home Assistant","addon":true}]

Modbus write/readback:

[{"id":"87361de4.0b4aa","type":"modbus-flex-write","z":"c1e03843.9d14a8","name":"Set state","showStatusActivities":false,"showErrors":true,"server":"86a33495.600fd8","emptyMsgOnFail":false,"keepMsgProperties":false,"x":840,"y":3820,"wires":[[],[]]},{"id":"668663b5.e26c4c","type":"function","z":"c1e03843.9d14a8","name":"On/Off","func":"var fc=6;\nvar sa=2504;\nvar addresses=1;\nvar value=msg.payload;\n\nmsg.slave_ip=\"192.168.1.30\";\nmsg.payload={\"value\":value , 'fc': fc, 'unitid': 1, 'address': sa , 'quantity': addresses };\nreturn msg;\n\n","outputs":1,"noerr":0,"initialize":"","finalize":"","x":710,"y":3820,"wires":[["87361de4.0b4aa"]],"info":"# 0  Deaktiverer Eco drift\n# 1  Aktiverer Eco"},{"id":"ec5d08d0.5511b8","type":"rbe","z":"c1e03843.9d14a8","name":"POC","func":"rbe","gap":"","start":"","inout":"out","property":"payload","x":590,"y":3820,"wires":[["668663b5.e26c4c"]],"info":"Videresender kun nye verdier/endringer for å hindre unødig data til modbus slave."},{"id":"a0729a78.535c78","type":"trigger","z":"c1e03843.9d14a8","name":"Tr.5s","op1":"","op2":"","op1type":"nul","op2type":"payl","duration":"5","extend":true,"overrideDelay":false,"units":"s","reset":"","bytopic":"all","topic":"topic","outputs":1,"x":470,"y":3820,"wires":[["ec5d08d0.5511b8"]],"info":"Videresender siste verdi etter 5 sek. for å unngå å jamme ned modbus slave, om ikke går ikke settpunkt gjennom."},{"id":"e204afdb.d756e","type":"change","z":"c1e03843.9d14a8","name":"Str.-->INT","rules":[{"t":"change","p":"payload","pt":"msg","from":"off","fromt":"str","to":"0","tot":"num"},{"t":"change","p":"payload","pt":"msg","from":"on","fromt":"str","to":"1","tot":"num"}],"action":"","property":"","from":"","to":"","reg":false,"x":340,"y":3820,"wires":[["a0729a78.535c78"]]},{"id":"aa920ab1.412b28","type":"inject","z":"c1e03843.9d14a8","name":"Poll(20s)","props":[{"p":"payload"},{"p":"topic","vt":"str"}],"repeat":"20","crontab":"","once":true,"onceDelay":"10","topic":"","payload":"","payloadType":"date","x":120,"y":3880,"wires":[["f04e59c8.5b2e88"]]},{"id":"f04e59c8.5b2e88","type":"function","z":"c1e03843.9d14a8","name":"Read","func":"var fc=3;\nvar sa=2504;\nvar addresses=1;\nvar slave_ip=msg.payload.slave_ip;\n\nmsg.slave_ip=\"192.168.1.30\";\nmsg.payload={value: msg.payload, 'fc': fc, 'unitid': 1, 'address': sa , 'quantity': addresses };\nreturn msg;\n\n","outputs":1,"noerr":0,"initialize":"","finalize":"","x":250,"y":3880,"wires":[["f5091f5f.b5b9c"]]},{"id":"f5091f5f.b5b9c","type":"modbus-flex-getter","z":"c1e03843.9d14a8","name":"Modbus","showStatusActivities":false,"showErrors":true,"logIOActivities":false,"server":"86a33495.600fd8","useIOFile":false,"ioFile":"","useIOForPayload":false,"emptyMsgOnFail":false,"keepMsgProperties":false,"x":380,"y":3880,"wires":[[],["57cebaa5.bc2e94"]],"info":"VTR300 Intern UR"},{"id":"57cebaa5.bc2e94","type":"function","z":"c1e03843.9d14a8","name":"Eco mode","func":"var msg0 = msg.payload.data[0];\n\nmsg.payload = msg0;\nreturn msg;","outputs":1,"noerr":0,"initialize":"","finalize":"","x":520,"y":3880,"wires":[["344e1f2d.df892","66c96a52.373bc4"]],"info":"# Engineering range: -30°C -> 0°C\n\nRaw 0 = 0°C\nRaw 65526 = -1°C\nRaw 65236 = -15°C\n\nRange 65526 - 65236 = 290\n290/29= 10Raw/1°C"},{"id":"344e1f2d.df892","type":"delay","z":"c1e03843.9d14a8","name":"","pauseType":"delay","timeout":"2","timeoutUnits":"seconds","rate":"1","nbRateUnits":"1","rateUnits":"second","randomFirst":"1","randomLast":"5","randomUnits":"seconds","drop":false,"x":660,"y":3880,"wires":[["9e1413fb.8afb6"]]},{"id":"9e1413fb.8afb6","type":"rbe","z":"c1e03843.9d14a8","name":"POC","func":"rbe","gap":"","start":"","inout":"out","property":"payload","x":790,"y":3880,"wires":[["1ca24cdc.d0ba03"]]},{"id":"c244f269.9faec","type":"change","z":"c1e03843.9d14a8","name":"Off ","rules":[{"t":"change","p":"payload","pt":"msg","from":"0","fromt":"num","to":"off","tot":"str"}],"action":"","property":"","from":"","to":"","reg":false,"x":1050,"y":3860,"wires":[["6cb7ca60.5c64e4"]]},{"id":"1ca24cdc.d0ba03","type":"switch","z":"c1e03843.9d14a8","name":"Int->Str.","property":"payload","propertyType":"msg","rules":[{"t":"eq","v":"0","vt":"num"},{"t":"eq","v":"1","vt":"num"}],"checkall":"true","repair":false,"outputs":2,"x":920,"y":3880,"wires":[["c244f269.9faec"],["fcc9726e.ec7"]]},{"id":"fcc9726e.ec7","type":"change","z":"c1e03843.9d14a8","name":"On","rules":[{"t":"change","p":"payload","pt":"msg","from":"1","fromt":"num","to":"on","tot":"str"}],"action":"","property":"","from":"","to":"","reg":false,"x":1050,"y":3900,"wires":[["71b09b27.5220b4"]]},{"id":"66c96a52.373bc4","type":"ha-entity","z":"c1e03843.9d14a8","name":"Eco mode state","server":"2c4e313e.d0fc5e","version":1,"debugenabled":false,"outputs":1,"entityType":"binary_sensor","config":[{"property":"name","value":"vtr300_eco_mode_state"},{"property":"device_class","value":""},{"property":"icon","value":"mdi:leaf"},{"property":"unit_of_measurement","value":""}],"state":"payload","stateType":"msg","attributes":[],"resend":false,"outputLocation":"","outputLocationType":"none","inputOverride":"allow","outputOnStateChange":false,"outputPayload":"","outputPayloadType":"str","x":680,"y":3920,"wires":[[]]},{"id":"940bc341.d45bc","type":"server-state-changed","z":"c1e03843.9d14a8","name":"Eco mode trigger","server":"2c4e313e.d0fc5e","version":1,"exposeToHomeAssistant":false,"haConfig":[{"property":"name","value":""},{"property":"icon","value":""}],"entityidfilter":"input_boolean.vtr300_eco_mode_dummy","entityidfiltertype":"exact","outputinitially":false,"state_type":"str","haltifstate":"","halt_if_type":"str","halt_if_compare":"is","outputs":1,"output_only_on_state_change":true,"for":0,"forType":"num","forUnits":"milliseconds","ignorePrevStateNull":true,"ignorePrevStateUnknown":true,"ignorePrevStateUnavailable":true,"ignoreCurrentStateUnknown":true,"ignoreCurrentStateUnavailable":true,"x":120,"y":3820,"wires":[["e204afdb.d756e"]]},{"id":"6cb7ca60.5c64e4","type":"api-call-service","z":"c1e03843.9d14a8","name":"Set Eco. Off","server":"868599a7.b14688","version":1,"debugenabled":false,"service_domain":"switch","service":"turn_off","entityId":"switch.vtr300_eco_mode","data":"","dataType":"json","mergecontext":"","output_location":"payload","output_location_type":"msg","mustacheAltTags":false,"x":1190,"y":3860,"wires":[[]]},{"id":"71b09b27.5220b4","type":"api-call-service","z":"c1e03843.9d14a8","name":"Set Eco. On","server":"868599a7.b14688","version":1,"debugenabled":false,"service_domain":"switch","service":"turn_on","entityId":"switch.vtr300_eco_mode","data":"","dataType":"json","mergecontext":"","output_location":"payload","output_location_type":"msg","mustacheAltTags":false,"x":1190,"y":3900,"wires":[[]]},{"id":"86a33495.600fd8","type":"modbus-client","name":"VTR300","clienttype":"tcp","bufferCommands":true,"stateLogEnabled":false,"queueLogEnabled":false,"tcpHost":"192.168.1.30","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},{"id":"2c4e313e.d0fc5e","type":"server","name":"Home Assistant","addon":true},{"id":"868599a7.b14688","type":"server","name":"Home Assistant","addon":true}]

Krdonner · February 5, 2021, 5:50pm

Wow, that helped immensely! I was way off trying to read the numbers coming in. Tried everything from node.js buf api. This seems to do the trick. Thanks alot

Jiran · April 20, 2023, 12:17pm

Hello. I would like to ask you for help with this: I have specification, wehere BMS manufacturer writes:
Register address (HEX): 1107
Remarks: 1%
MBAP Head: 7 Bytes
Function code: 1 Byte
Data lenght: 1 Byte
Data: N Bytes

How should look modbus.yaml configuration please?
Thank you

nikito7 · April 20, 2023, 8:57pm

It’s Modbus TCP. Address in decimal

Jiran · April 21, 2023, 6:16am

Ye, thank you, of course. But how exactly should look config? Decimal mean uint or uint16? Where to wirght data lenght? How about MBAP etc?

cmragnar · April 21, 2023, 6:21am

I have this in a package. Should work if you put that in a yaml file and include that in your config.

modbus:
  - name: VSR300
    type: tcp
    host: 192.168.1.204
    port: 502
    timeout: 3 #Timeout for slave response in seconds (default=3)
    delay: 3 #Time to sleep in seconds after connecting and before sending messages (defualt=0)

    climates:
      - name: vent_VSR300
        address: 12102
        slave: 1
        scale: 0.1
        offset: 0
        precision: 1
        max_temp: 30
        min_temp: 15
        temp_step: 1
        target_temp_register: 2000

nikito7 · April 21, 2023, 1:00pm

modbus:

  - name: edpbox3
    type: tcp
    host: 10.1.0.47
    port: 9502
    delay: 1
    timeout: 3
    retries: 3
    retry_on_empty: true
    message_wait_milliseconds: 250

    sensors:

      - name: "EB3 Voltage L1" # 0x006C
        slave: 1
        address: 108
        input_type: input
        count: 1
        data_type: uint16
        precision: 1
        scale: 0.1
        unit_of_measurement: V
        device_class: voltage
        scan_interval: 15

Jiran · April 28, 2023, 5:23am

This is an example for me?

uSlackr · April 28, 2023, 4:55pm

I believe so.