Re: [mihini-dev] problem on modbus

[Julien Vermillard <jvermillard@xxxxxxxxx>]

Another tip : I think the address between the arduino modbus and mihini are shifted of 1.

On Wed, Apr 24, 2013 at 12:04 AM, Benjamin Cabé <bcabe@xxxxxxxxxxxxxxxxxx> wrote:

Yong-Jie,

For a reason I ignore (bug in the Arduino Modbus stack or in Mihini), it might help if you put a small delay between the moment you create the modbus client and the moment you try reading registers:

modbus_client = modbus.new(MODBUS_PORT, MODBUS_CONF)

log(LOG_NAME, "INFO", "Modbus      - OK")

sched.wait(2)

while true do

  local values = modbus_client:readHoldingRegisters(1,0,9)

  print(values)

  sched.wait(5)

end

Cheers,

Benjamin-- 

De : <He>, Yong-Jie <334627855@xxxxxx>
Répondre à : Mihini project developer discussions <mihini-dev@xxxxxxxxxxx>
Date : mardi 23 avril 2013 17:45
À : mihini-dev <mihini-dev@xxxxxxxxxxx>
Objet : [mihini-dev] problem on modbus

Hi,

I am trying to get data via modbus on mihini.

This is the program upload into Arduino:

This is the program running in the mihini:

local sched  = require 'sched'

local modbus = require 'modbus'

local MODBUS_PORT = "/dev/ttyACM0" -- serial port on RaspPi

local MODBUS_CONF = {baudRate = 9600 }

local LOG_NAME = "MODBUS_APP"

local function main()

  log.setlevel("INFO")

log(LOG_NAME, "INFO", "Application started")

modbus_client = modbus.new(MODBUS_PORT, MODBUS_CONF)

log(LOG_NAME, "INFO", "Modbus      - OK")

while true do

local values = modbus_client:readHoldingRegisters(1,0,9)

print(values)

sched.wait(5)

end

  

end

sched.run(main)

sched.loop()

When I run this lua program, this is the output:

Tue Apr 23 15:37:02 2013 MODBUS_APP-INFO: Application started

Tue Apr 23 15:37:02 2013 MODBUS_APP-INFO: Modbus      - OK

nil

nil

nil

nil

nil

nil

nil

nil

nil

nil

Tue Apr 23 15:38:03 2013 MODBUS-WARNING: Failure while processing a request: timeout

Can anyone give me some idea?

Best Reagrds

Yong-Jie

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