+- LogicMachine Forum (https://forum.logicmachine.net)
+-- Forum: LogicMachine eco-system (https://forum.logicmachine.net/forumdisplay.php?fid=1)
+--- Forum: Scripting (https://forum.logicmachine.net/forumdisplay.php?fid=8)
+--- Thread: Modbus 8bit low and high (/showthread.php?tid=3216)
Modbus 8bit low and high - toujour - 11.03.2021
Hi,
how can I create a profile (or a Script ) to read and write this modbus word (Register 21) ?
BR,
Alberto
RE: Modbus 8bit low and high - Daniel - 12.03.2021
Try this, you may need to subtract -1 from the register.
Code:
if not mb then
require('luamodbus')
mb = luamodbus.rtu()
mb:open('/dev/RS485', 9600, 'E', 8, 1, 'H')
mb:connect()
end
mb:setslave(1)
value = mb:readregisters(21)
address = bit.rshift(value, 8)
baudrate = value-address*256
log(address,baudrate)
newaddress = 2
newbaudrate = 1
reg=newaddress*256 + newbaudrate
mb:writeregisters(21, reg)