This is a breakoutboard 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 breakoutboard includes the SP3485 RS-485 transceiver, filter capacitor, and other components shown on the schematic. We've broken out the RS-485 output...
COMMUNICATION BOARD, RS485; Accessory Type:Communication Board; Communication Option:RS485 Modbus protocol; For Use With:9500P Programmable Temperature and Process Controller