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+--- Thread: Tulikivi sauna heater relay board (/showthread.php?tid=3417)
Tulikivi sauna heater relay board - MikeBrignate - 10.06.2021
Hello
Could somebody help me with Tulikivi relay board for the sauna heater, trying to read sauna temperature with CMD 11, but the result always 0. When I connecting my touch panel, then pannel starts asking for data from the relay board and a log is showing some values. So the connection is established, but the request is wrong.
Code:
require('serial')
port, err = serial.open('/dev/RS485', {
baudrate = 9600,
databits = 8,
stopbits = 1,
parity = 'none',
duplex = 'half'
})
port:flush()
port:write(0xB)
data = port:read(2,3)
byte = string.byte(data)
log(string.format("%o, %x, %d", byte,byte,byte))
port:close()protocol attached
Thank you
RE: Tulikivi sauna heater relay board - admin - 11.06.2021
Try this:
Code:
require('serial')
port, err = serial.open('/dev/RS485', {
baudrate = 9600,
databits = 8,
stopbits = 1,
parity = 'none',
duplex = 'half'
})
function send(cmd, data)
local msg, res, err, b1, b2
data = data or 0
msg = string.char(
bit.band(cmd, 0xFF),
bit.band(bit.rshift(data, 8), 0xFF),
bit.band(data, 0xFF)
)
port:flush()
port:write(msg)
res, err = port:read(2, 3)
if type(res) == 'string' then
if #res == 2 then
b1, b2 = res:byte(1, 2)
return bit.bor(bit.lshift(b1, 8), b2)
else
return nil, 'invalid reply'
end
else
return nil, err
end
end
-- turn on
res, err = send(1, 1)
log(res, err)
-- turn off
res, err = send(1, 0)
log(res, err)
-- read current temperature
res, err = send(15)
log(res, err)