RS-232
Connections
71
RS-232 Straight-through Cable Connections
In the RS-232 mode, the
XTRALINK IP
’s ports are configured as DTEs
like a computer. If the device connected to the
XTRALINK IP
is
configured as a DCE use a straight through cable wired as shown
below:
Figure 62. Straight-through DB-9 to DB-9 RS-232 Serial
Cable
RS-232 Crossover (null modem) Cable Connections
When connecting to a PC or another DTE device, use a crossover cable
(also called a null modem cable).
Figure 63. Crossover DB-9 to DB-9 RS-232 Serial Cable
RS-232 Signal Names
DB-9
Pin#
Connections
DB-9
Pin#
Signal
Carrier Detect
CD
1
1
CD
Receive Data
RD
2
2
RD
Transmit Data
TD
3
3
TD
Data Terminal Ready
DTR
4
4
DTR
Signal Ground/Common GND 5
5 GND
Data Set Ready
DSR
6
6
DSR
Request to Send
RTS
7
7
RTS
Clear to Send
CTS
8
8
CTS
Ring Indicator
RI
9
9
RI
RS-232 Signal Names
DB-9
Pin#
Connections
DB-9
Pin#
Signal
Carrier Detect
CD
1
1
CD
Receive Data
RD
2
2
RD
Transmit Data
TD
3
3
TD
Data Terminal Ready
DTR
4
4
DTR
Signal Ground/Common
GND 5
5 GND
Data Set Ready
DSR
6
6
DSR
Request to Send
RTS
7
7
RTS
Clear to Send
CTS
8
8
CTS
Ring Indicator
RI
9
9
RI
RS-232
Connections
72
RS-232 Straight-through DB-9 to DB-25 Conversion
Connections
Figure 64. DB-9 to DB-25 Straight-through Cable
Connections
RS-232 Crossover DB-9 to DB-25 Conversion Connections
Figure 65. DB-9 to DB-25 Crossover (null modem) Cable
Connections