I don't use Pantel but I have heard pretty much only good things about them.

But in my 25+ years of dealing with RS-232, I can't say I've ever seen someone use pin 1 for ground, 3 for RX & 4 for TX. That is strange.

But then I realised that if you happen to have read the pin numbers in reverse on the top row, they are correct. So I'm guessing someone messed up during the engineering / manufacturing process.

Do Pantel at least have a sku for an adaptor?

However it is well documented in their RS-232 document so hopefully it doesn't catch out too many people. And the protocol seems very comprehensive.