Mapping Options for the RS485 Mode

There are even fewer options in the RS422 mode:

Mapping option

Available signals

Pins on the DB9M connector

Missing lines

#6,2

#3,4

#8,9

#7,1

Option 0

RX/TX/CTS/RTS/DSR/DTR

RX

TX

CTS

RTS

dsr, dtr

Option 5

RX/TX/DSR/DTR + RX/TX + RX/tx

RX

TX

RX2

TX2

dsr, dtr, rx4, tx4

Option 14

RX/TX/DSR/DTR + RX/tx/DSR/DTR

RX

TX

DSR4

DTR4

dsr, dtr, rx4, tx4