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(2) COM1 (9-pin Block): RS232/422/485 Port

COM1 port can function as RS232/422/485 port. In normal settings COM1 functions

as RS232 port. With compatible COM cable COM1 can function as RS422 or RS 485

port. User also needs to go to BIOS to set ‘Transmission Mode Select’ for COM1

at first, before using specialized cable to connect different pins of this port.

RS232 DCD

RS232 SIN

RS232 SOUT

RS232 DTR

GND

RS232 RI

RS232 CTS

RS232 RTS

RS232 DSR

RS232 Mode

Pin1

For RS422 Mode

RS422TX-(B)

RS422TX+(A)

RS422RX+(A)

RS422RX-(B)

(B)

For RS485 Mode

RS485 D-(B)

RS485 D+(A)

(3) COM2/COM3 (9-pin Block): RS232 Port