class Modbus::PDU::ReadBitsRequest

Base class PDU for modbus bit based functions (request message)

Attributes

bit_count[RW]
start_addr[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_bits.rb, line 19
def initialize(data = nil, func_code = nil)
  @start_addr = 0
  @bit_count  = 0
  super
end

Public Instance Methods

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_bits.rb, line 30
def decode(data)
  @start_addr = data.shift_word
  @bit_count  = 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_bits.rb, line 40
def encode
  data = super
  data.push_word @start_addr
  data.push_word @bit_count
  data
end
length() click to toggle source

Returns the length of the PDU in bytes.

@return [Integer] The length.

# File lib/modbus/pdu/read_bits.rb, line 52
def length
  5
end
validate() click to toggle source

Validates the PDU. Raises exceptions if validation fails.

# File lib/modbus/pdu/read_bits.rb, line 59
def validate
  fail ClientError, "Register count must be in (1..127), got '#{@bit_count.inspect}'" unless (1..127).include?(@bit_count)
end