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Transition Networks SDSFE31xx-100 Industrial Device Server
24-Hour Technical Support: 1-800-260-1312 International: 00-1-952-941-7600
60
Copper DB-9 (RS-232) serial cable specifications
What is RS-232
(DB-9)?
RS-232 is a serial device control protocol that provides an interface between Data
Terminal Equipment (DTE) and Data Communications Equipment (DCE) that
employs serial binary data interchanges.
DB-9 cable
specifications
Wire category: 3 to 5
Maximum data rate: 100Kb/s, 115.2Kb/s asynchronous (distance dependent)
Gauge: 24 to 22 AWG
Maximum cable distance: 50 ft (15.24 m)
DB-9 cable
pinouts
Figure 59 shows the DB-9 (RS-232) serial cable pin assignments and pinout chart.
DB-9 Connector Pin Assignments
No Code Description
Signal
Direction
1 DCD Data Carrier Detect IN
2 RX Receive Data IN
3 TX Transmit Data OUT
4 DTR Data Terminal Ready OUT
5 GND Ground —
6 DSR Data Set Ready IN
7 RTS Request to Send OUT
8 CTS Clear to Send IN
9 RI Ring Indicator IN
Figure 59: DB-9 Connector and Cable Pin Assignment Chart
Note: The Device Server is configured as a DTE device. Use a straight-through
cable for connecting to a DCE device, or a crossover cable for connecting to
other DTE devices.