Keyspan USA-19HS is the only thing I've ever been able to get to work with all of the devices we use (Allen Bradley and Parker PLCs, shipping scales, network equipment, the list goes on).
In the end, though, the guys who worked on those systems just kept an old D610 around running XP and used it exclusively for programming those older systems. There was (is?) also the "E-Legacy Extender" for Dell Latitude laptops that provided a real hardware serial port as opposed to a USB version. We had the best luck with the Keyspan USA-19HS adapters, but there is just some programming software out there that can't fathom a port not named COM1 at $3F8 or COM2 at $2F8. I worked in that industry for a while as well. Most of the time on newer equipment they work fine, if your serial device is expecting to see all of the older handshaking business that happened with serial than it may not work correctly. The only time I have ever experienced any issues was when I was dealing with very dedicated machinery (like a Allen-Bradley PLC, or a old Simplex fire alarm system). Featuring data transfer rates up to 230 Kbps, the USA-19HS can be used with any RS-232 serial device-modems, GPS devices, cell phones, hand-held scanners, point-of-sale systems, touch screens, medical and scientific instruments and more.Most of the time they work just fine. An LED shows adapter status and data activity at a glance. Simply plug it into the USB port of your computer using the included cable, install the software and you're ready to connect a serial device. The USA-19HS draws power directly from your computer through the USB connection.
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