I’d say it’s quinary but can easily be represented binarily

1. short mark, dot or dit ( ▄ ): 1

2. longer mark, dash or dah ( ▄▄▄ ): 111

3. intra-character gap (between the dits and dahs within a character): 0

4. short gap (between letters): 000

5. medium gap (between words): 0000000