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+--- Thread: Relay board R421A08 (/showthread.php?tid=1403)
Relay board R421A08 - Thomas - 18.05.2018
Hello
I've done a short script for controlling cheap relay board from AliExpress Routerboard R421A08
If someone is interested in:
User library named ecl_modbus_rtu
Code:
local lt_modbus = {
it_rboard_actions={
close=0x100,
open=0x200,
toggle=0x300, -- close/open/close/open
switch=0x400, -- switch 1 of 8
impulse=0x0500, -- close one for 1s, open other relays
close_delay=0x0600 --close, then open with delay[s] 00 - FF - (0x06[00-FF])
},
is_port='/dev/RS485-1',
il_baudrate=9600,
ecl_modbus_rtu_writeregister=function(self,ll_slave,ll_register,ll_value)
-- ll_slave =RS485 RTU Number set at relay board DIPs
-- ll_Register = relay Nr 1-8
-- ll_value = it_rboard_actions
require('luamodbus')
mb = luamodbus.rtu()
mb:open(self.is_port, self.il_baudrate, 'N', 8, 1, 'H')
mb:connect()
mb:setslave(ll_slave)
mb:writeregisters(ll_register,ll_value)
mb:close()
end
}
return lt_modbusCode for testing:
Code:
local mbus=require('user.ecl_modbus_rtu')
mbus:ecl_modbus_rtu_writeregister(1,4,mbus.it_rboard_actions.close)
mbus:ecl_modbus_rtu_writeregister(1,5,mbus.it_rboard_actions.close)
mbus:ecl_modbus_rtu_writeregister(1,6,mbus.it_rboard_actions.close)
mbus:ecl_modbus_rtu_writeregister(1,6,mbus.it_rboard_actions.open)RE: Relay board R421A08 - JohnTH - 22.05.2018
Thank you.
I have been trying to communicate with tha same relayboard with no luck.
I will give this a try.
