RS232 Communacation

[mkaymak]

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

Code:

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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

[admin]

Use 'F' duplex instead of 'H' for RS232.

[mkaymak]

Still no change,anything else

[admin]

I'm not even sure if this device supports Modbus over RS232 - the documentation states two different things. Have you tried using RS485 instead?

[mkaymak]

Yeah i've tried but still no clue.

---

Should i change addresses to Hex ?

[mkaymak]

After a few tries i got invalid CRC error.How can i solve it?

[admin]

Are you using RS232 or RS485? Is GND connected between devices?

[mkaymak]

I'm using RS232 and ground is connected

Code:

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{   "manufacturer": "DATAKOM",   "description": "D300 JENERATOR",   "mapping": [     { "address": 10240, "name": "Sebeke Faz L1 gerilimi", "datatype": "uint32", "bus_datatype": "uint32", "type": "inputregister"},     { "address": 10242, "name": "Sebeke Faz L2 gerilimi", "datatype": "uint32", "bus_datatype": "uint32", "type": "inputregister"},     { "address": 10244, "name": "Sebeke Faz L3 gerilimi", "datatype": "uint32", "bus_datatype": "uint32", "type": "inputregister"},     { "address": 10264, "name": "Sebeke Faz L1 akimi", "datatype": "uint32", "bus_datatype": "uint32", "type": "inputregister"},     { "address": 10266, "name": "Sebeke Faz L2 akimi", "datatype": "uint32", "bus_datatype": "uint32", "type": "inputregister"},     { "address": 10266, "name": "Sebeke Faz L3 akimi", "datatype": "uint32", "bus_datatype": "uint32", "type": "inputregister"},     { "address": 10292, "name": "Sebeke toplam aktif guc", "datatype": "uint32", "bus_datatype": "uint32", "type": "inputregister"},     { "address": 10308, "name": "Sebeke toplam reaktif guc", "datatype": "uint32", "bus_datatype": "uint32", "type": "inputregister"},     { "address": 10324, "name": "Sebeke toplam guc", "datatype": "uint32", "bus_datatype": "uint32", "type": "inputregister"},     { "address": 10338, "name": "Sebeke Faz", "datatype": "uint16", "bus_datatype": "uint16", "type": "inputregister"},     { "address": 10363, "name": "Yakit Seviyesi", "datatype": "uint16", "bus_datatype": "uint16", "type": "inputregister"}                    ] }

Added profile

[admin]

Disable Modbus mapper, run this debug script and post what you get in Logs: https://forum.logicmachine.net/showthrea...2#pid16012
Modify the script with correct serial port and Modbus device settings.

[rw_echo]

Can anyone help me with the following questions? Thank you in advance.
Q1:How many modbus slave devices can each RS485 or RS232 interface of LM drive?
Q2:Is there a limit on the total length range of the bus?

[Daniel]

Q1 RS485 = 31, RS232 = 1
Q2. Not so simple https://electrical-engineering-portal.co...dbus-rs485

[rw_echo]

@Daniel ,thank you for your timely answer.