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This feature lets you simply and quickly build an RS-485 network with just two wires. More importantly, application software previously written for half duplex RS232 environments can be maintained without need for modification. UNO-1170 User Manual 10 2.3.4 RS-232/422/485 Selection COM2 and COM3 support 9-wire RS-232, RS-422 or RS-485 interfaces, and you can set corresponding jumpers to select serial ports as RS-232 or RS-422/485 interfaces shown in Table 2.2. Please note to reset the system to