In principle, the first note must have a value of at least CHF 50.-. After that it is also possible to use smaller notes such as CHF 10/20.- to use.
In general, all banknotes of the 8th banknote series (1995) and the 9th banknote series (2016) are accepted.
Series 8 is not accepted for the 1000.- bank note!
The latest series 9 of the bank notes is shown below:
The following is the link to the website of the "Swiss National Bank", where the older series of notes can be seen with pictures: