Hello,
I have a problem concerning the implementation of a communication between a
node server and a device. I use the library net in node that provides a
communication port type TCP client .
code:
var net = require('net');
var HOSTPLC = '192.168.45.120'; //Adresse de l'appareil. var PORTPLC = 9600;
//Port de communication.
var client = new net.Socket();
The problem is that when I send my string for the specific communication
protocol to my device using eg:
code:
client.write(sFinsCmdRead);
The function automatically adds unwanted values to each 16 hex value (
observed using a network protocol analyzer) that just create an error in
the interpreter of the device. The value is sent C2:
eg:
> 46:49:4e:53:00:00:00:1a:00:00:00:02:00:00:00:00:c2:80:00:02:00:78:00:00:ef:bf:bd:00:00:01:01:c2:82:00:64:00:00:01
>
>
>
This imply error in the communication protocol.
My questions: Is there a way to define the size of frames sent or otherwise
eliminate the C2 value in the code? To do this, where do I look (in the
code) ?
The initial objective was to communicate directly between the device and
page hml5 but as it is not possible, I use the server node client side to
interact with the device. Is the basic idea is valid
or is there better way to implement this ?
Thank you all for your help.
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