com) and Jameco Electronics (www.jameco.com).
Figure 5-3: An RJ-11 (left) or RJ-45 (right) modular connector can be an option for
interfaces of up to eight lines.
Chapter 5
64
1-
)2- '
To connect a DTE to a DCE with a 9-pin D-sub at each end, the cable connects
each wire straight across, pin 1 to pin 1, pin 2 to pin 2, and so on. Connecting
a 9-pin D-sub to a 25-pin D-sub requires a cable or adapter that routes
the signals correctly (Figure 5-4).
$
A gender changer is a adapter that enables two male (pin) connectors or two
female (receptacle) connectors to connect to each other. In an ideal world, every
DTE would use a male connector, and every DCE would use a female connector.
If you happen to have a situation where you need to connect a DTE and
DCE whose connectors have the same gender, an adapter called a gender
Table 5-1: TIA-561 provides this recommended pinout for use with an 8-position
RJ-type connector.
1 RI
2 CD
3 DTR
4 SG
5 RX
6 TX
7 CTS
8 RTS
Figure 5-4: Use this wiring to convert between 9-pin and 25-pin connectors.
Designing RS-232 Links
65
changer can help. To connect two male connectors, use a female-to-female gender
changer, which has receptacles on both ends. To connect two female connectors,
use a male-to-male gender changer, which has pins on both ends.
Gender changers connect the RS-232 lines straight across: TX to TX, RX to
RX, and so on.
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