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package Device::Modbus::RTU; |
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2452
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use Device::Modbus::RTU::ADU; |
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905
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use Device::SerialPort; |
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1447
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80
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5
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15
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use Carp; |
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3
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157
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15
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use strict; |
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3
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55
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14
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use warnings; |
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58
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8
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3
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3
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57
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use v5.10; |
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our $VERSION = '0.020'; |
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3
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3
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15
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use Role::Tiny; |
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3
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2341
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13
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14
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sub open_port { |
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0
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my $self = shift; |
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# Validate parameters |
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croak "Attribute 'port' is required for a Modbus RTU client" |
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5
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100
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201
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unless exists $self->{port}; |
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# Defaults related with the serial port |
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4
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100
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23
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$self->{baudrate} //= 9600; |
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4
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100
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$self->{databits} //= 8; |
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4
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100
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$self->{parity} //= 'even'; |
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4
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100
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20
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$self->{stopbits} //= 1; |
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4
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100
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$self->{timeout} //= 10; # seconds |
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# Serial Port object |
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my $serial = Device::SerialPort->new($self->{port}); |
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78
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croak "Unable to open serial port " . $self->{port} unless $serial; |
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32
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40
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$serial->baudrate ($self->{baudrate}); |
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4
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73
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$serial->databits ($self->{databits}); |
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4
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56
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$serial->parity ($self->{parity}); |
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4
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55
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$serial->stopbits ($self->{stopbits}); |
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4
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48
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$serial->handshake('none'); |
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38
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# char_time and read_char_time are given in milliseconds |
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$self->{char_time} = |
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4
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49
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1000*($self->{databits}+$self->{stopbits}+1)/ $self->{baudrate}; |
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42
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4
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33
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$serial->read_char_time($self->{char_time}); |
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4
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100
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55
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if ($self->{baudrate} < 19200) { |
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3
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27
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$serial->read_const_time(3.5 * $self->{char_time}); |
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} |
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else { |
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1
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6
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$serial->read_const_time(1.75); |
48
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} |
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50
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4
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50
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64
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$serial->write_settings || croak "Unable to open port: $!"; |
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4
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59
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$serial->purge_all; |
52
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4
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34
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$self->{port} = $serial; |
53
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4
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19
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return $serial; |
54
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} |
55
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56
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sub read_port { |
57
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5840
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5840
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0
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20800
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my $self = shift; |
58
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5840
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15770
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my ($bytes, $read) = $self->{port}->read(255); |
59
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# say STDERR "> " . join '-', unpack 'C*', $read; |
60
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5840
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36371
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$self->{buffer} = $read; |
61
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5840
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10846
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return $read; |
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} |
63
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64
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sub write_port { |
65
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2
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2
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0
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9
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my ($self, $adu) = @_; |
66
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2
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11
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$self->{port}->write($adu->binary_message); |
67
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} |
68
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69
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sub disconnect { |
70
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2
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2
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0
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6
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my $self = shift; |
71
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2
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24
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$self->{port}->close; |
72
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} |
73
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74
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#### Modbus RTU Operations |
75
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76
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sub parse_buffer { |
77
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5847
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5847
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0
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8318
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my ($self, $bytes, $pattern) = @_; |
78
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croak "Timeout error" unless |
79
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5847
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100
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66
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509456
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defined $self->{buffer} && length($self->{buffer}) >= $bytes; |
80
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9
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35
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return unpack $pattern, substr $self->{buffer},0,$bytes,''; |
81
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} |
82
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83
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sub new_adu { |
84
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5845
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5845
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0
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18683
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my ($self, $msg) = @_; |
85
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5845
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14564
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my $adu = Device::Modbus::RTU::ADU->new; |
86
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5845
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100
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31058
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if (defined $msg) { |
87
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5
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27
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$adu->message($msg); |
88
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5
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100
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74
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$adu->unit($msg->{unit}) if defined $msg->{unit}; |
89
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} |
90
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5844
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12745
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return $adu; |
91
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} |
92
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93
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### Parsing a message |
94
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95
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sub parse_header { |
96
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5840
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5840
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0
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17710
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my ($self, $adu) = @_; |
97
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5840
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10993
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my $unit = $self->parse_buffer(1, 'C'); |
98
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2
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14
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$adu->unit($unit); |
99
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2
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24
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return $adu; |
100
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} |
101
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102
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sub parse_footer { |
103
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2
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2
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0
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196
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my ($self, $adu) = @_; |
104
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2
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6
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my $crc = $self->parse_buffer(2, 'v'); |
105
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2
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10
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$adu->crc($crc); |
106
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2
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4
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return $adu; |
107
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} |
108
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109
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1; |
110
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111
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__END__ |