Modbus RTU485-2

[josep]

Good afternoon

I have a Modbus calorie meter connected to the RS485-2 port of my LM5pL and I would like to know how I have to do it to read 32bit values in Modbus RTU using scripts, thank you very much.

THX.

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Hello again, I try to communicate using this code, I can read something but I don't know if it's correct, thank you

Code:

require('luamodbus')
mb = luamodbus.rtu()

mb:open('/dev/RS485-2', 2400, 'E', 8, 1, 'H')
mb:connect()

mb:setslave(44)

        res101 = mb:readregisters(1)
if res101 == nil then
 grp.update('32/2/1', 0)
else
    grp.update('32/2/1', res101*0,01)
    end
        os.sleep(1)
        
        res102 = mb:readregisters(2)
if res102 == nil then
 grp.update('32/2/2', 0)
else
 grp.update('32/2/2', res102*0,01)
 end
   os.sleep(1)

   res103 = mb:readregistervalue(3, "uint32")
grp.update('32/2/3', res103)
os.sleep(1)

   res105 = mb:readregistervalue(5, "uint32")
grp.update('32/2/5', res105)
os.sleep(1)

   res107 = mb:readregistervalue(7, "uint32")
grp.update('32/2/7', res107)
os.sleep(1)

   res109 = mb:readregistervalue(9, "uint32")
grp.update('32/2/9', res109)
os.sleep(1)

   res113 = mb:readregisters(13)
grp.update('32/2/13', res113)
os.sleep(1)

   res114 = mb:readregistervalue(14, "uint32")
grp.update('32/2/14', res114)
os.sleep(1)

   res116 = mb:readregistervalue(16, "uint32")
grp.update('32/2/16', res116)
os.sleep(1)

   res118 = mb:readregistervalue(18, "uint32")
grp.update('32/2/18', res118)
os.sleep(1)

   res120 = mb:readregisters(20)
grp.update('32/2/20', res120)
os.sleep(1)

mb:close()

mb:open('/dev/RS485-2', 2400, 'E', 8, 1, 'H')
mb:connect()

mb:setslave(45)

        res201 = mb:readregisters(1)
if res201 == nil then
 grp.update('32/3/1', 0)
else
    grp.update('32/3/1', res201*0,01)
    end
        os.sleep(1)    

        res202 = mb:readregisters(2)
if res202 == nil then
 grp.update('32/3/2', 0)
else
 grp.update('32/3/2', res202*0,01)
 end
   os.sleep(1)

   res203 = mb:readregistervalue(3, "uint32")
grp.update('32/3/3', res203)
os.sleep(1)

   res205 = mb:readregistervalue(5, "uint32")
grp.update('32/3/5', res205)
os.sleep(1)

   res207 = mb:readregistervalue(7, "uint32")
grp.update('32/3/7', res207)
os.sleep(1)

   res209 = mb:readregistervalue(9, "uint32")
grp.update('32/3/9', res209)
os.sleep(1)

   res213 = mb:readregisters(13)
grp.update('32/3/13', res213)
os.sleep(1)

   res214 = mb:readregistervalue(14, "uint32")
grp.update('32/3/14', res214)
os.sleep(1)

   res216 = mb:readregistervalue(16, "uint32")
grp.update('32/3/16', res216)
os.sleep(1)

   res218 = mb:readregistervalue(18, "uint32")
grp.update('32/3/18', res218)
os.sleep(1)

   res220 = mb:readregisters(20)
grp.update('32/3/20', res220)
os.sleep(1)

mb:close()