Serial & USB Converter

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RS485 to USB Converter

PRORS-009822

This is the newest revision and fixes issues with the last board. This breakout board pairs an SP3485 RS-485 transceiver with an FT232RL USB UART IC to convert a USB stream to RS-485. The SP3485 is a half-duplex transceiver, so it can only communicate one way at a time, but it can reach transmission speeds of up to 10Mbps.

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New product

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The TXDEN pin of the FT232RL is connected to the transmit and receive enable inputs of the SP3485, this line is used to control the transmission mode of the RS-485 transceiver. With the proper drivers installed, the FT232RL will enumerate as a virtual COM port; the drivers are available for Windows, Mac and Linux.

This breakout board includes the SP3485, FT232, TX/RX/RTS LEDs, Mini-B USB connector, filter capacitors, and other components shown on the schematic.

Features:

Fully equipped with SP3485 RS-485 transceiver and FT232RL USB UART IC
Operates from USB supply
RX, TX, and RTS LED indicators
Mini-B USB connector
USB power and RX/TX lines broken out to a 0.1" pitch header
RS-485 input/output broken out to RJ-45 connector, 3.5mm screw terminal, and 0.1" pitch header
Driver/Receiver Enable connected to RTS line of FT232RL
-7V to +12V Common-Mode Input Voltage Range

Documents: