The only thing to watch out for is that some, relatively rare, serial cables were wired backwards (straight through [pin 1 to pin 1, and so on], rather than each end’s Transmit pins to the other end’s Receive pins). As far as I can tell these cables were intended for some early model of printer, though I’ve no idea which. I want to say it may have been the original ImageWriter, but I think that dated back to when Apple was still using DE-9 connectors for Mac serial ports, so really I’ve no idea.