Arista MicroBox-7824B-E01 - Serial Port Pin Definitions

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Pins in the serial port(COM1~COM4)

6 7 8 9

1 2 3 4 5

Pin NO. Denition(RS-232 mode) Denition(RS-422/RS-485 mode)

1 DCD, data carrier detect TX-, Transmit data ground (RS-422/RS-485)

2 RXD, Receive data TX+, Transmit data(RS-422/RS-485)

3 TXD, Transmit data RX+, Receive data (RS-422)

4 DTR, Data terminal ready RX-, Receive data ground (RS-422)

5 GND, Signal ground GND, Signal ground

6 DSR, Data set ready N.C.

7 RTS, Request to send N.C

8 CTS, Clear to send N.C

9 Ring-IN, Ring indicator N.C.

Note:

COM1~COM4 ports can be set to RS-232 mode(default), RS-422 mode or RS-485 Mode.