DTECH RS232 to RS485 Converter Adapter with 4 Position Terminal Block for Long Haul Data Communication Supports 600W Anti-Surge

If you're reading this, it's because you know you need - quite specifically - a physical conversion between a D9 RS232 presentation and a screw-terminal RS485! I assume this must have internally house some active electronics to perform the conversion - I can't see that they've listed what brand chip that is (e.g., whether it's a Texas Instruments or a lesser known brand). Regardless - it works. I would guess their stated up-to 115.2kbps baud rate is the certified maximum of whatever brand chip they're using inside. Comes well-packaged (unless I'm mistaken, it's not an anti-static bag - just plastic), and is a pretty lightweight (but good quality) plastic construction itself. The included instruction manual is pretty thorough (see review photos). It includes diagrams for wiring RS485, which is a helpful (physical) cheat-sheet to keep on your desk. For the price - definitely recommended!

If you are trying to convert between RS-232 and RS 485, this works very well and a simple to use.

I like the brand and bought this based on that and recommendations. It is well built, never a hiccough and just keeps on working.

Excellent seller, quick shipping, as described, great deal, I recommend!. Thank you!.

I just used them to hook 2 PC's together but they worked perfectly plug and play no null adapter needed

Needed a way to hook a PC to an RS485 power meter, so plugged this in and connected two wires to the screw terminals, positive and negative. Amazingly worked perfect very first try. This item simply works.