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SDM220 modbus
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#!/usr/bin/env perl | |
use strict; | |
use warnings; | |
use Device::Modbus::RTU::Client; | |
my $client = Device::Modbus::RTU::Client->new( | |
port => '/dev/ttyUSB0', | |
baudrate => 9600, | |
parity => 'none', | |
); | |
$client->send_request(Device::Modbus::Request->new( | |
code => 0x04, | |
address => 0x0000, | |
quantity => 0x0002, | |
unit => 0x01 | |
)); | |
my $resp = $client->receive_response; | |
if ($resp->success) { | |
my $values = $resp->values; | |
my $hi = $values->[0]; | |
my $lo = $values->[1]; | |
my $hi_l=$hi & 0xff; | |
my $hi_h=($hi>>8) & 0xff; | |
my $lo_l=$lo & 0xff; | |
my $lo_h=($lo>>8) & 0xff; | |
my $word = ($hi_h << 24) + ($hi_l << 16) + ($lo_h << 8) + $lo_l; | |
my $num = (($word & 0x80000000) ? -1 : 1) * (2 ** ((($word & 0x7F800000) >> 23) - 127)) * ( ($word & 0x007FFFFF | 0x00800000) / (1 << 23)); | |
printf "V %f\n", $num; | |
} | |
$client->disconnect; |
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