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Logic Machine Forum › LogicMachine eco-system › Gateway v
modbus ascii

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modbus ascii
raphael Offline
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#1
15.10.2018, 13:45
hello,
I have to control an equipement communicating in modbus rs485 ascii. Is the LM able to communicate with it? If it is, do you have en example a the script that I have to use?
thanks a lot
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admin Offline
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#2
15.10.2018, 14:35
There's no ASCII support in ModBus library, but you can use raw RS485 communication: http://openrb.com/docs/serial.htm
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lpala Offline
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#3
27.10.2018, 08:07
(15.10.2018, 13:45)raphael Wrote: hello,
I have to control an equipement communicating in modbus rs485 ascii. Is the LM able to communicate with it? If it is, do you have en example a the script that I have to use?
thanks a lot

Hi raphael,
here is a bad-but-working-and-not-complete implementation of modbus ascii purely written in lua for LM.
You can have a look at test file to understand the implementation and usage.

https://github.com/lucapalazzo/luamodbus-native

Luca
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emme Offline
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Posts: 44
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#4
16.04.2021, 09:50
(27.10.2018, 08:07)lpala Wrote:
(15.10.2018, 13:45)raphael Wrote: hello,
I have to control an equipement communicating in modbus rs485 ascii. Is the LM able to communicate with it? If it is, do you have en example a the script that I have to use?
thanks a lot

Hi raphael,
here is a bad-but-working-and-not-complete implementation of modbus ascii purely written in lua for LM.
You can have a look at test file to understand the implementation and usage.

https://github.com/lucapalazzo/luamodbus-native

Luca

Luca,
I'm starting using your library in a LM5 lite, works like a charm on TCP, but what about serial connection?

My understanding is that that portion is not yet completed.... do you have plans for implementing it?
thanks
ciao
M
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