RS232 Communacation

[mkaymak]

Hi Admin
I'm trying to integrate LM with generator to read 3 phase values , fuel level etc.

Code:

require('luamodbus')
mb = luamodbus.rtu()
res = mb:open('/dev/RS232', 9600, 'N', 8, 1, 'H')
log(res)
if res then
  mb:connect()
  mb:setslave(3)
  mb:setresponsetimeout(30)

    -- read 3-phase system voltage
  r1, r2 = mb:readregisters(10240, 2)
    
  if r1 and r2 then

    result = bit.lshift(r1, 16) + r2
    grp.checkwrite('32/5/1', result)
    log(result)
  end
 
end

mb:close()

I used this code to read registers LM opens port succesfully but no value writed at all.
I tried changing Rx - Tx pins already but helped not at all.
Any help would appreciated
Thanks