Sony DFP-R3000 Operation Manual page 11

Location and Function of Parts
5 RS-422 connector
Pin No. I/O Signal
1 – GND
2 O RTS(+)
3 O RTS(–)
4 O TXD(+)
5 O TXD(–)
6 I CTS(+)
7 I CTS(–)
8 I RXD(+)
9 I RXD(–)
6 RS-232C connector
Pin No. I/O Signal
1 – NC
2 I RXD
3 O TXD
4 O DTR
5 – GND
6 – NC
7 O RTS
8 I CTS
9 – NC
10(E)