The HD300 reads a standard 26 bit HID card like this:

1 bit parity, 8 bits site, 9 -25 card number, 1 bit parity.

For example: A26-bit format card can be created like this:

1-11111111-0001011111101100-1 with the first set of ones representing
the site code and the second set of ones and zeros representing the
credential number.

1386 LGGMN is an example of a standard format.