Embedded Systems LogiMachine5 Power - Page 187

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80. end
81.
82. -- handle modbus and knx
83. mb:handleslave()
84. knxclient:step()
Example usage (TCP / master mode):
require('luamodbus')
mb = luamodbus.tcp()
mb:open('192.168.0.1', 5000)
mb:connect()
-- verbose output and select slave number 10
mb:setdebug(true)
mb:setslave(10)
-- read input from reg 1 to 5, get slave-specific data
mb:readinputregisters(1, 4)
mb:reportslaveid()
-- close serial connection
mb:close()
Example usage (RTU / master mode):
require('luamodbus')
mb = luamodbus.rtu()
-- open serial connection (half duplex)
mb:open('/dev/ttyS2', 38400, 'E', 8, 1, 'H')
mb:connect()
-- verbose output and select slave number 10
mb:setdebug(io.write)
mb:setslave(10)
-- read input from reg 1 to 5, get slave-specific data
mb:readinputregisters(1, 4)
mb:reportslaveid()
-- close serial connection
mb:close()
Read/write examples
-- multiple coil read
coil1, coil2, coil3 = mb:readcoils(10, 3)
-- multiple coil read to table
coils = { mb:readcoils(0, 3) }
Note: coil1 or coils[ 1 ] will be nil on error
-- multiple write
coil1 = true