Xerox 4215 Installation Planning Manual page 54

XEROX 4219/MRP AND 4215/MRP INSTALLATION PLANNING GUIDE
Figure B-6 shows how the null modem cable switches several
signals.
Figure B-6. Null modem serial cable wiring
DTR
DSR
RTS
CTS
DCD
TXD
RXD
GND
INTERFACE SUPPORT
DTR
DSR
RTS
CTS
DCD
TXD
RXD
GND
B-7