With Modbus 0.9 -> see http://search.cpan.org/~cosimo/Protocol-Modbus/lib/Protocol/Modbus/Transaction.pm --- 
use Protocol::Modbus;

# Initialize protocol object
my $proto = Protocol::Modbus->new( driver=>'TCP' );

# Get a request object
my $req = $proto->request(
      function => Protocol::Modbus::FUNC_READ_COILS, # or 0x01
      address  => 4016, # Register dispavgVpv from MidNight Charger
      quantity => 1,
);

# Init transaction and execute it, obtaining a response
my $trn = Protocol::Modbus::Transaction->new( request=>$req );
my $res = $trn->execute();

# Pretty-print response on stdout
print $res . "\n";   # Modbus Response PDU(......)

[download]
##############################################
or you can use MBClient -> https://github.com/sourceperl/MBclient 
use strict;
use MBclient;

my $m = MBclient->new();
# define server target
$m->host("localhost");
$m->unit_id(1);

# read 16 bits register from ad 0 to 9
my $words = $m->read_holding_registers(4100, 40); # First 40 Register 
+of MidNight Charger

# print words
foreach my $word (@$words) {
  print $word."\n";
}

# clean exit
$m->close();
exit 0;

[download]

In reply to Re^7: Need help with Modbus by olibo
in thread Need help with Modbus by pashanoid

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