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USB to RS485 is known for its multi-drop characteristics, which means it can be used for connecting multiple RS485 devices in a two-wire network. USB to RS422 is often used for extending a RS232 wire by using a USB to RS422 adapter at each end of a RS232 wire. It’s straightforward to convert the RS-485 line to the unbalanced UART interface using a dedicated IC. The simplest solution (as the one discussed here) does have reasonable protection features but is not galvanically-isolated ⚠ The USB to RS485 converter and USB RS422 adapter are made in a variety of models and designs. The standard USB RS485 converter / USB to RS422 adapter is a non-isolated adapter which is used for many businesses, offices and personal devices. The isolated USB to RS485 converter / USB to RS422 adapter is used in many industrial and business environments as they are built to be resistant to moderate voltage spikes. Quality Guarantee - SerialComm converters are low priced, high quality products and made to last a lifetime. They are manufactured in a ISO-9001 certified facility using surface mount technology with lead free components. All converters are pretested prior to shipment and are fully guaranteed for 5 years. There are no converters, Commercial or Industrial that surpass SerialComm's quality standards at any price tag.
As you can see, the module is a very compact and ready to use piece of electronics. It performs the USB (Universal Serial Bus) to two wire RS485 (Two-Wire Half-Duplex) and vice versa conversion. The module holds an FT232RL USB UART IC with MAX485 to switch between the USB and RS-485 communication standards.This is an industrial USB to RS485 converter with original FT232RL inside. It features embedded protection circuits such as lightning-proof, resettable fuse, ESD protection, and TVS diode, etc. It's pretty small in size. Note: DMX software tutorials are not included here due to paucity of space, thus you need to spend enough time learning more about them! Transmission mode: point-to-multipoint (up to 32 nodes, it is recommended to use repeaters for 16 nodes or more). Keep note, many of the users did not like the idea of using a converter without galvanic-isolation especially in an industrial environment.
Protection: 600W lightning-proof and surge-suppress, 15KV ESD protection (onboard 120R balancing resistor). The USB to RS485 Converter / USB to RS422 Converter (for USB to RS485 Serial Adapters - Coolgear - Buy the Top USB to RS485 Devices Online) Note: The 120Ω resistor is only required if the module is the first or last device in a multi-drop RS-485 system, to meet RS-485 termination requirements. So, you may need to remove it in certain situations.
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Note: Try to keep the RS-485 bus as short as possible because long wires may add extra interference. You can use regular cat5e networking cable for the wiring but after twisting the A and B wires, it is not very crucial.
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