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Hello,
I found a mismatch in the output wiring of the c-port to the DB-9 connector. The pin c3 is connected to the pin 4 of the DB-9 and the pin c4 is at the pin 5 of the DB-9.
Greetings

Hello,

The pin allocations are correct. This is due to the fact that the port pins are numbered 0 to 7, while the DB-9 connector pins are numbered 1 to 8 (with 9 as 0V).

The DB9 pin number is always 1 greater than the corresponding port pin number.