class Modbus::PDU::ReadRegistersResponse

Base class PDU for modbus register based functions (response message)

Attributes

reg_values[RW]

Public Class Methods

new(data = nil, func_code = nil) click to toggle source

Initializes a new PDU instance. Decodes from protocol data if given.

@param data [Modbus::ProtocolData] The protocol data to decode.

Calls superclass method Modbus::PDU::new
# File lib/modbus/pdu/read_registers.rb, line 76
def initialize(data = nil, func_code = nil)
  @reg_values = []
  super
end

Public Instance Methods

byte_count() click to toggle source

Returns the length of the register values in bytes.

@return [Integer] The length.

# File lib/modbus/pdu/read_registers.rb, line 108
def byte_count
  @reg_values.size * 2
end
decode(data) click to toggle source

Decodes a PDU from protocol data.

@param data [Modbus::ProtocolData] The protocol data to decode.

# File lib/modbus/pdu/read_registers.rb, line 86
def decode(data)
  byte_count = data.shift_byte
  byte_count.div(2).times { @reg_values.push data.shift_word }
end
encode() click to toggle source

Encodes a PDU into protocol data.

@return [Modbus::ProtocolData] The protocol data representation of this object.

Calls superclass method Modbus::PDU#encode
# File lib/modbus/pdu/read_registers.rb, line 96
def encode
  data = super
  data.push_byte byte_count
  @reg_values.each { |value| data.push_word value }
  data
end
length() click to toggle source

Returns the length of the PDU in bytes.

@return [Integer] The length.

# File lib/modbus/pdu/read_registers.rb, line 117
def length
  # +1 for func_code, +1 for byte_count
  byte_count + 2
end
validate() click to toggle source

Validates the PDU. Raises exceptions if validation fails.

# File lib/modbus/pdu/read_registers.rb, line 125
def validate

end