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This cable is a three-wire null modem cable. Transmitted data on one end of the cable is connected
to Received data at the other end, and vice versa. The male DB-25 end can be plugged directly
into most serial terminals and printers without any adapters. The female DB-25 end plugs directly
into any RoHS DB-25 serial port.
DB-25 4-Wire Hardware Handshaking (DTR) Cable
The four-wire cable is sufficient for an older terminal, printer, or other DTE (Data Terminal
Equipment) devices configured for DTR (hardware) flow control. However, some terminals and
printers may use a signal other than DTR (Data Terminal Ready) for flow control. In addition,
some terminals and printers may have other cable requirements. Consult your terminal or printer
manual for this information. For more universal compatibility, use a fully-wired DB-25
terminal/printer cable.
Table B-3
lists the pin-out connection between the DB-25 adapter and the DB-25 terminal/printer
with DTR handshaking.
Table B-3 Terminal/Printer Cable with DTR Handshaking
DB-25 Female (Card End)
Signal
TxD
RxD
CTS
SG
GND
IMPORTANT:
control. Consult your documentation for specific wiring requirements.
DB-25 Hardware Handshaking (RTS/CTS) Cable
The cabling shown in
configured for RTS/CTS (hardware) flow control. However, some terminals and printers may
have other cable requirements. Consult your terminal or printer manual for this information.
For universal compatibility, use a fully-wired DB-25 terminal/printer cable.
Table B-4
lists the pin-out connection between the DB25 adapter and the DB-25 terminal/printer
with RTS/CTS handshaking.
Table B-4 Terminal/Printer Cable with RTS/CTS Handshaking
DB-25 Female (Card End)
Signal
TxD
RxD
RTS
CTS
DSR+DCD
SG
34
Peripheral Connections
Pin
2
3
5
7
Shell
Some terminal or printer manufacturers may use different methods of flow
Table B-4
is often sufficient for a terminal, printer, or other DTE devices
Pin
2
3
4
5
6+8
7
DB-25 Male (Peripheral)
Pin
Connected to
3
Connected to
2
Connected to
20
Connected to
7
Connected (via
Shell
shield) to
Jumpered
4+5
DB-25 Male (Peripheral)
Pin
Connected to
3
Connected to
2
Connected to
5
Connected to
4
Connected to
20
Connected to
7
Signal
RxD
TxD
DTR
SG
GND
RTS+CTS
Signal
RxD
TxD
CTS
RTS
DTR
SG
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