HP AD278A and AD279A PCI Multiplexer Support Guide, November 2008

Table B-4 Terminal/Printer Cable with RTS/CTS Handshaking (continued)
DB-25 Male (Peripheral)DB-25 Female (Card End)
DSR+DCD6+8Connected to20DTR
GNDShellConnected (via
shield) to
ShellGND
IMPORTANT: Some terminal or printer manufacturers may use different methods of flow
control. Consult your documentation for specific wiring requirements.
DB-25 Fully-Wired Terminal/Printer Cable
The cabling shown in Table B-5 supports most serial terminals or printers with either software
or hardware handshaking. This cable works with any RoHS DB25 serial port. This cable works
with either an AD278A connector or an AD281A port module.
Table B-5 lists the pin-out connection between the DB25 adapter and the DB25 terminal/printer
with software or hardware handshaking.
Table B-5 Terminal/Printer Cable for Software (XON/XOFF) or Hardware (DTR) Handshaking
DB-25 Male (Terminal/Printer)DB-25 (Card End)
SignalPinPinSignal
CTS5Connected to4RTS
GNDShellConnected toShellGND
RxD3Connected to2TxD
TxD2Connected to3RxD
SG7Connected to7SG
DTR20Connected to5CTS
DCD+DSR8+6Connected to20DTR
RTS4Connected to8+6DCD+DSR
IMPORTANT: Some terminal or printer manufacturers may use different methods of flow
control. Consult your documentation for specific wiring requirements.
DB-25 Modem Cable
To connect a DB-25 equipped asynchronous adapter to a modem, use a standard straight-through
cable. A straight-through cable must have a DB-25 female connector at the AD278A fan-out end
or the AD281A port module end, and a DB-25 male connector at the modem end. All 25 pins are
connected, 1 to 1, 2 to 2, 3 to 3 and so on. Use a shielded cable, and connect pin 1 of each connector
to the cable shield.
RS-232 Asynchronous: RJ-45
This section provides the pin diagram for RJ-45 cable.
RJ-45 Pin Assignments
Table B-6 shows the pin diagram for RJ45 connector.
RS-232 Asynchronous: RJ-45 35