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

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.

Used a couple of these to adapt to existing rs-485 networks to talk to a PC even when wired properly we would get garbled information. Networks were grounded properly and used shielded cables. Not sure if it was due to something in our setup but we are still working on the problem.

Great product

These are simple pass through converters that work as they should. I like that they are powered through the DB-9 connection with out aux power needed.

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!