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Description: This is a breakout board for the SP3485 RS-485 transceiver IC, which will convert a UART serial 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. This board requires a very low amount of power and can operate from a single +3.3VDC supply.
This breakout board includes the SP3485 RS-485 transceiver, filter capacitor, and other components shown on the schematic. We’ve broken out the RS-485 output to three different connections: (1) an RJ-45 connector, (2) a 3-pin 3.55mm screw terminal, and (3) a 3-pin 0.1" pitch header; none of these output connectors come populated.
Based on 2 ratings:
1 of 2 found this helpful:
Although it is reasonably priced and possessed of a clever variety of plated holes for the attachment of various connectors, if I had done my homework I would not have purchased this board. Why? Because the obscure SP3485 chip that it uses does not have automatic flow control and is therefore not compatible with many popular open source libraries for RS485 and in particular Modbus RTU.
Unfortunately there don’t seem to be a lot of other choices except certain parts in online auctions and building one’s own board with MAX488, MAX13487E or another flow-control transceiver.
So this board delivers what it promises, but what it promises is a clever implementation of a chip that no one else uses for quite good reasons. Not recommended.