Lack of a proper padding in a binary conversion

General
1

Hi,

I try to convert hex to binary using this code:

var pattern='5c48a02b8c00';
var pattern_bits ="";
msg.payload=parseInt("0x"+pattern).toString(2).padStart(4, '0');
return msg;

It returns the string:10111000100100010100000001010111000110000000000. I have checked this result in online calc, and the result is:010111000100100010100000001010111000110000000000* The difference is in the first zero from the left. Probably it is because 5 is 101. But based on code 101 should be padded to four characters (0101). What is wrong?

2

You need padStart(48, '0').
You want 48 bits total.
Numerically there is no difference of course.

3

What is it that you want to do with the result?

4

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