Class: ModBus::TCPServer

Inherits:
GServer
  • Object
show all
Defined in:
lib/rmodbus/tcp_server.rb

Constant Summary collapse

@@funcs = 
[1,2,3,4,5,6,15,16]

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(port = 502, uid = 1) ⇒ TCPServer

Returns a new instance of TCPServer.



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# File 'lib/rmodbus/tcp_server.rb', line 26

def initialize(port = 502, uid = 1)
  @coils = []
  @discret_inputs = []
  @holding_registers =[]
  @input_registers = []
  @uid = uid
  super(port)
end

Instance Attribute Details

#coils ⇒ Object

Returns the value of attribute coils.



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# File 'lib/rmodbus/tcp_server.rb', line 22

def coils
  @coils
end

#discret_inputs ⇒ Object

Returns the value of attribute discret_inputs.



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# File 'lib/rmodbus/tcp_server.rb', line 22

def discret_inputs
  @discret_inputs
end

#holding_registers ⇒ Object

Returns the value of attribute holding_registers.



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# File 'lib/rmodbus/tcp_server.rb', line 22

def holding_registers
  @holding_registers
end

#input_registers ⇒ Object

Returns the value of attribute input_registers.



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# File 'lib/rmodbus/tcp_server.rb', line 22

def input_registers
  @input_registers
end

Instance Method Details

#serve(io) ⇒ Object 



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# File 'lib/rmodbus/tcp_server.rb', line 35

def serve(io)
  req = io.read(7)
  if req[2,2] != "\x00\x00" or req[6].to_i != @uid
    io.close
    return
  end

  tr = req[0,2]
  len = req[4,2].to_int16
  req = io.read(len - 1)
  func = req[0].to_i

  unless @@funcs.include?(func)
    param = { :err => 1 }
  end
  
  case func
    when 1
      param = parse_read_func(req, @coils)
      if param[:err] == 0
        val = @coils[param[:addr],param[:quant]].bits_to_bytes
        res = func.chr + val.size.chr + val
      end
    when 2
      param = parse_read_func(req, @discret_inputs)
      if param[:err] == 0
        val = @discret_inputs[param[:addr],param[:quant]].bits_to_bytes
        res = func.chr + val.size.chr + val
      end
    when 3
      param = parse_read_func(req, @holding_registers)
      if param[:err] == 0
        res = func.chr + (param[:quant] * 2).chr + @holding_registers[param[:addr],param[:quant]].to_ints16
      end
    when 4
      param = parse_read_func(req, @input_registers)
      if param[:err] == 0
        res = func.chr + (param[:quant] * 2).chr + @input_registers[param[:addr],param[:quant]].to_ints16
      end
    when 5 
      param = parse_write_coil_func(req)
      if param[:err] == 0
        @coils[param[:addr]] = param[:val]
        res = func.chr + req
      end
    when 6
      param = parse_write_register_func(req)
      if param[:err] == 0
        @holding_registers[param[:addr]] = param[:val]
        res = func.chr + req
      end
    when 15
      param = parse_write_multiple_coils_func(req)
      if param[:err] == 0
        @coils[param[:addr],param[:quant]] = param[:val][0,param[:quant]]
        res = func.chr + req
      end
    when 16
      param = parse_write_multiple_registers_func(req)
      if param[:err] == 0
        @holding_registers[param[:addr],param[:quant]] = param[:val][0,param[:quant]]
        res = func.chr + req
      end
  end
  if param[:err] ==  0
    io.write tr + "\0\0" + (res.size + 1).to_bytes + @uid.chr + res
  else
    io.write tr + "\0\0\0\3" + @uid.chr + (func | 0x80).chr + param[:err].chr
  end 
end