I have an old device that uses a serial port for communications with a PC, and for the life of me I can not get it to work with a USB to RS232 device. Works fine if I connect it to a real serial port. Between the DB25 and the Max238 are a few chips marked "Tokin 614 J", my web searches are coming up empty. I think they are some kind of ESD protection, maybe an opto-isolator. The have 2 legs on one side, two more on the other which suggests opto and the USB/232 adapters will not have to current to push through one of these.
Before I tear them out and put jumpers in I thought I would ask and see if anyone knows what they are and what harm might come from the removal. If the only harm might be that I burn the Max238, so be it. I may also bypass that part of the Max238 and install an FTDI USB to TTL serial device and be done. Default operations are with no handshaking, so I should only need TX, RX, ground which should allow USB conversion without too much difficulty.
Thanks for any help provided.