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Topic:
RS-232 Input in HEX
This thread has 1 response. Displaying all posts.
Post 1 made on Friday December 13, 2019 at 11:19
JohnL28
Long Time Member
Joined:
Posts:
July 2006
18
Iíve always had issues with RS232 inputs in HEX. Iím hoping someone can help. I created two simplified examples to help explain the issue.

In Scenario 1, I just send a HEX code to the TV. Works perfectly.

In Scenario 2, I manipulated data and create the HEX code in the necessary format. When I send to the TV, it does nothing.

Does anyone know what I need to do in Scenario 2 to get the TV to accept the code? It is likely some type of ASCII to HEX conversion but canít figure it out.

SCENERIO 1:

var SendHex1 = "\x08\x22\x01\x00\x00\x0F\xC6";
System.print("SendHex1 [" + SendHex1 + "]");
Serial.OT.send(SendHex1);

Output:
SendHex1 [ " [hex format]

Result:
TV resets volume to 15

SCENERIO 2:

var SendHex2 = "08 22 01 00 00 0F C6";
SendHex2 = "\\x" + SendHex2.replace(/\s/g, "\\x");
System.print("SendHex2 [" + SendHex2 + "]");
Serial.OT.send(SendHex2);

Output:
SendHex2 [\x08\x22\x01\x00\x00\x0F\xC6]

Result:
TV does nothing
Post 2 made on Saturday December 14, 2019 at 12:15
raiders_fan94
Long Time Member
Joined:
Posts:
September 2002
321
Well, the outputs don't look the same. Not sure if that's a mistype on your end.

Also, depending on the compiler, if you've specified 0x before an alphanumeric, it may treat it as byte code and thus not a string, the minute you start manipulating a string, it will always treat it as a string. Thus the ASCII to hex conversion issue.

Maybe try converting to binary afterwards and see what the 1s and 0s are.
Never underestimate the predictability of stupidity

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