I have an old GNT-4601 punched tape reader/punch that I'm trying to connect to a modern computer. Using the DTE port and a usb-to-serial adapter, I'm able to send data to the punch but I can't read anything back. Py-serial gives a single
I suspect that I may be using the type of wrong cable. The machine uses RS-232C with a DB-25 connector. Here is the manual with more information: https://archive.org/stream/bitsavers_gntGNT46012_1858526/GNT_4601_Operators_Manual_Jun82#page/n7/mode/2up
Any suggestions on what to try or how to debug the problem?