try stuff?

 
modpoll
-b 4800 #          Baudrate
-p none #          No parity
-a 1 #          Slave address (1-255 for serial, 0-255 for TCP, 1 is d
+efault

-r 13 #          Start reference (1-65536, 1 is default)
-c 1 #          Number of values to read (1-125, 1 is default), option
+al for writ
ing (use -c 1 to force FC5 or FC6)
/dev/ttyUSB0
[download]

so

my $client = Device::Modbus::RTU::Client->new(
    port     => '/dev/ttyUSB0',
    baudrate => 4800,
    parity   => 'none',
);
 
my $req = $client->read_holding_registers(
    address  => 1, # -r
    quantity => 1, #-c
);
 
$client->send_request($req);
my $resp = $client->receive_response;
[download]

https://grep.metacpan.org/search?q=start&qd=Device-Modbus&qft=

https://metacpan.org/release/JFRAIRE/Device-Modbus-RTU-0.022/source/examples/simple_client_rtu.pl

---

---

Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!

Titles consisting of a single word are discouraged, and in most cases are disallowed outright.

Read Where should I post X? if you're not absolutely sure you're posting in the right place.

Please read these before you post! —

• How do I compose an effective node title?
• How do I post a question effectively?
• Markup in the Monastery

Posts may use any of the Perl Monks Approved HTML tags:

a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr

You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)

	For:		Use:
	&		&
	<		&lt;
	>		&gt;
	[		&#91;
	]		&#93;

Link using PerlMonks shortcuts! What shortcuts can I use for linking?

See Writeup Formatting Tips and other pages linked from there for more info.