Review on π JBtek USB to RS485 Converter Adapter: High-Quality ch340T Chip, 64-bit Windows 7 Compatibility by Mark Toth
Does not meet RS-485 specifications
This part does not properly control the RS-485 bus. This doesn't even work in my point-to-point setup, but it might work for some people depending on cable length and receiver type. The problem, as shown in the diagram, is that the activation of the transfer driver (DE, pin 3 on the MAX485) is controlled by the transfer signal. This means if the adapter sends a 1, there is no drive current and the MAX485 goes into receive mode. If you need to meet the RS-485 standard, please select another part.
- Delivery was very quick
- Expensive
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