OK -- I'm back on this.
I converted this ASR-33 to RS232 a long time ago. There are plenty of current loop to RS232 converters available or you can build one.
I can easily talk to the ASR with my computer over the serial port, or at least I used to be able to...
I think it was 110 N72 A total of 10 bits. 1 start bit, 7 data bits and 2 stop bits.
As soon as I get the linux program running again, I will at least have it running on a PC.
Then I need to run it for about two days to loosen up all the mechanical stuff. You have to run these machines or they clog up.
I'll post a video soon.
Greg