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Modbus TCP slave example
#7
(02.02.2017, 12:09)admin Wrote: Replace this:
Code:
-- modbus slave, listen on all interfaces and default port 502
mb = luamodbus.tcp()
mb:open('0.0.0.0', 502)

-- setting slave id is optional
-- mb:setslave(1)

With this (adjust serial settings and slave id as needed):
Code:
mb = luamodbus.rtu()
mb:open('/dev/RS485', 9600, 'E', 8, 1, 'H')
mb:connect()
mb:setslave(1)

RS-232 is mostly used for ModBus ASCII which is not supported.

works like a charm

but needed to change port to /dev/RS485-1 to make it working


Messages In This Thread
Modbus TCP slave example - by admin - 08.01.2016, 08:46
RE: Modbus TCP slave example - by Deniss - 15.01.2016, 08:58
RE: Modbus TCP slave example - by admin - 15.01.2016, 14:39
RE: Modbus TCP slave example - by admin - 18.01.2016, 12:57
RE: Modbus TCP slave example - by automatikas - 02.02.2017, 11:30
RE: Modbus TCP slave example - by admin - 02.02.2017, 12:09
RE: Modbus TCP slave example - by automatikas - 02.02.2017, 13:35
RE: Modbus TCP slave example - by automatikas - 29.03.2017, 10:26
RE: Modbus TCP slave example - by admin - 29.03.2017, 10:37
RE: Modbus TCP slave example - by leondias - 29.03.2017, 10:40
RE: Modbus TCP slave example - by automatikas - 29.03.2017, 10:41
RE: Modbus TCP slave example - by admin - 29.03.2017, 10:55
RE: Modbus TCP slave example - by automatikas - 29.03.2017, 11:15
RE: Modbus TCP slave example - by Deniss - 20.04.2017, 06:47
RE: Modbus TCP slave example - by admin - 20.04.2017, 15:38
RE: Modbus TCP slave example - by duvelken - 02.12.2017, 08:13
RE: Modbus TCP slave example - by admin - 03.12.2017, 09:58
RE: Modbus TCP slave example - by FatMax - 13.12.2018, 14:44
RE: Modbus TCP slave example - by admin - 13.12.2018, 15:23
RE: Modbus TCP slave example - by FatMax - 13.12.2018, 15:53
RE: Modbus TCP slave example - by rw_echo - 16.03.2023, 07:57
RE: Modbus TCP slave example - by admin - 17.03.2023, 10:52

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