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!