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+--- Thread: ModBus IP / RTU error com (/showthread.php?tid=6226)
ModBus IP / RTU error com - Gadjoken - 18.12.2025
Hello everyone,
I have several air handling units connected behind an RS485-to-IP module, using the Modbus RTU protocol. As a result, there are no communication errors with the IP module itself; however, communication errors may occur on the air handling units connected downstream.
For example, if one air handling unit experiences a communication fault, this is correctly recorded in the error log within the Modbus tab. I would like to know whether there is a way to propagate or retrieve this error in order to trigger an email notification.
Best regards.
RE: ModBus IP / RTU error com - admin - 19.12.2025
Use a scheduled script:
Code:
key = 'modbus_error_time'
time = storage.get(key, 0)
items = db:getall([[
SELECT *
FROM modbus_errors
WHERE errortime>?
ORDER BY errortime
]], time)
if #items == 0 then
return
end
texts = {}
for _, item in ipairs(items) do
time = item.errortime
date = os.date('%c', time)
texts[ #texts + 1 ] = date .. ' - ' .. item.errortext
end
message = table.concat(texts, '\n')
mail('user@example.com', 'Modbus errors', message)
storage.set(key, time)RE: ModBus IP / RTU error com - Gadjoken - 19.12.2025
Perfect as usual
B.R.