ModeBus with serial interface

Hello

This is not a bug but a question seeking help as I could not find them in documents.

I am trying to use this module to connect to a battery that supports Modbus and read data. Using the software that came with battery is working so my connections and battery are working, but I am not able to configure the different parameters.

I am always getting timeout when trying simple getter as below

[{"id":"88deba32.459178","type":"tab","label":"Flow 1"},{"id":"7443f003.00d78","type":"modbus-getter","z":"88deba32.459178","name":"","showStatusActivities":true,"showErrors":true,"unitid":"38","dataType":"Coil","adr":"4096","quantity":"1","server":"e71eb878.ef5e08","useIOFile":false,"ioFile":"","useIOForPayload":false,"x":340,"y":80,"wires":[["ae00dbc8.95ef18"],[]]},{"id":"73612a54.d8e954","type":"inject","z":"88deba32.459178","name":"","topic":"","payload":"","payloadType":"date","repeat":"","crontab":"","once":false,"x":140,"y":40,"wires":[["7443f003.00d78"]]},{"id":"ae00dbc8.95ef18","type":"debug","z":"88deba32.459178","name":"","active":true,"console":"false","complete":"true","x":530,"y":40,"wires":[]},{"id":"e71eb878.ef5e08","type":"modbus-client","z":"88deba32.459178","name":"battery1","clienttype":"serial","bufferCommands":true,"stateLogEnabled":true,"tcpHost":"127.0.0.1","tcpPort":"502","tcpType":"DEFAULT","serialPort":"COM3","serialType":"RTU","serialBaudrate":"9600","serialDatabits":"8","serialStopbits":"1","serialParity":"none","serialConnectionDelay":"100","unit_id":38,"commandDelay":10,"clientTimeout":1000,"reconnectTimeout":2000}]

From the document of the battery, I concluded the following

BMS code switch value range 0～15，The BMS communication base address 38，BMS communication address is sum of code switch value and communication base address. UnitId = 38

RegId for voltage is 0x1000 so I used Address 4096

and I used quantity 1.

Is my conclusion correct about the different settings, is their a definition of what is UnitId, Address, RegId

Thanks

  contribModbus:core:client Client -> {"info":"queue read msg","message":{"value":1517841108577,"unitid":"38","fc":1,"address":"4096","quantity":"1","messageId":"5a786ad41c82fb1d1c27e4f0"},"state":"EMPTY","queueLength":1} Serial@COM3:9600bit/s default Unit-Id: 38 +1ms
  contribModbus:getter {"topic":"7443f003.00d78","payload":{"value":1517841108577,"unitid":"38","fc":1,"address":"4096","quantity":"1","messageId":"5a786ad41c82fb1d1c27e4f0"},"_msgid":"d053c53f.5f1068","queueNumber":0,"queueUnit":38} +19ms
  contribModbus:core:client Client -> {"state":"QUEUEING","message":"dequeue command serial","delay":10} Serial@COM3:9600bit/s default Unit-Id: 38 +15ms
  contribModbus:core:client Client -> {"type":"queue check","unitid":38,"sendAllowed":true,"queueLength":1} Serial@COM3:9600bit/s default Unit-Id: 38 +0ms
  contribModbus:core:client Client -> {"type":"serial sending and wait","unitid":38,"queueLength":0,"sendAllowedForNext":false,"delay":10} Serial@COM3:9600bit/s default Unit-Id: 38 +3ms
  contribModbus:core:client Client -> {"info":"read msg","message":{"value":1517841108577,"unitid":"38","fc":1,"address":"4096","quantity":"1","messageId":"5a786ad41c82fb1d1c27e4f0"},"unitid":38,"timeout":1000,"state":"QUEUEING"} Serial@COM3:9600bit/s default Unit-Id: 38 +3ms
  contribModbus:core:client Client -> {"info":"queue response activate sending","message":{"value":1517841108577,"unitid":"38","fc":1,"address":"4096","quantity":"1","messageId":"5a786ad41c82fb1d1c27e4f0"}} Serial@COM3:9600bit/s default Unit-Id: 38 +1s
  contribModbus:core:client Client -> event: activate old: QUEUEING new: ACTIVATED Serial@COM3:9600bit/s default Unit-Id: 38 +3ms
  contribModbus:core:client Client -> event: queue old: ACTIVATED new: QUEUEING Serial@COM3:9600bit/s default Unit-Id: 38 +4ms
  contribModbus:core Remove Message In:<5a786ad41c82fb1d1c27e4f0> Out:<5a786ad41c82fb1d1c27e4f0> +2m
  contribModbus:getter Timed out +1s
  modbus-serial modbusErrorHandling:Timed out +15s
  contribModbus:core:client Client -> {"state":"QUEUEING","message":"dequeue command serial","delay":10} Serial@COM3:9600bit/s default Unit-Id: 38 +12ms
  contribModbus:core:client Client -> {"type":"queue check is not a unit","unitid":null} Serial@COM3:9600bit/s default Unit-Id: 38 +3ms

[yaacov]

Hi, all The battary software message is not pure modbus syntax, but does look like ascii modbus:

~	delimiter (in ascii modbus the delimiter is : )
25	UnitID
01	Read Coil Status (FC=01)
46C2	The Data Address of the first coil to read.
0000	The total number of coils requested.
FD99	should be LRC

My 2 cents are:

1. the software use some proprietary dialect that is not pure modbus.
2. try to use ascii modbus.
3. try also UnitID 25, it seems to work for the dialect the battery software use 😃

[shahbour]

I will test that today when I reach office