188
coil2 = false
coil3 = false
mb:writebits(10, coil1, coil2, coil3)
-- multiple write from table
coils = { true, false, false }
mb:writebits(10, unpack(coils))
Core functions:
luamodbus.rtu()
Creates new Modbus RTU object
luamodbus.tcp()
Creates new Modbus TCP object
Modbus object functions:
Core functions:
mb:open(port, [baudrate = 9600, [parity = 'N', [databits = 8, [stopbits = 2]]]])
RTU mode - opens the serial port. (parity: 'N' - none, 'E' - even, 'O' - odd; databits: 7 or
8; stopbits: 1 or 2)
mb:open(ip, [port = 502])
TCP mode - prepares connection to the specified IP and port (optional)
mb:connect()
opens serial or network connection
mb:close()
closes an open connection
mb:flush()
flushes any unsent data
Slave functions:
mb:receive()
receives data from master with 1 minute timeout
returns data as a binary string on success and nil, error description on error
mb:setmapping(coils, inputs, holding_regs, input_regs)
creates memory mapping for the registers with size specified for each type
mb:handleslave()
waits for an incoming indication from master and sends a reply when necessary
mb:getcoils(start, count)
mb:getdiscreteinputs(start, count)
mb:getinputregisters(start, count)
mb:getregisters(start, count)
gets one or many register/coil values from mapping from the start address
returns all values on success and nil, error description on error, exception code if
applicable
mb:setcoils(start, v1, [v2, [v3, ...]])
mb:setdiscreteinputs(start, v1, [v2, [v3, ...]])
mb:setinputregisters(start, v1, [v2, [v3, ...]])
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