Hi Kornel,
Thank you for your response. However, for my solution, I need additional information. I need to know whether the PPS-3 pin on the C1 connector of the Reach M2 has 3.3 V, as described in the documentation Specification | RTK Modules , or 5 V, as indicated in this post
[Reach M2 - Output RS232 and 1 PPS - #11 by cmura]