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AX2550 Motor Controller User’s Manual 133
Cable configuration
Cable configuration
The RS232 connection requires the special cabling as described in the figure below. The 9-
pin female connector plugs into the PC (or other microcontroller). The 15-pin male connec-
tor plugs into the AX2550.
It is critical that you do not confuse the connector’s pin numbering. The pin numbers on
the drawing are based on viewing the connectors from the front (facing the sockets or
pins). Most connectors have pin numbers molded on the plastic.
Extending the RS232 Cable
The AX2550 is delivered with a 4-foot cable adapter which may be too short, particularly if
you wish to run and monitor the controller inside a moving robot.
RS232 extension cables are available at most computer stores. However, you can easily
build one using a 9-pin DB9 male connector, a 9-pin DB9 female connector and any 3-wire
cable. These components are available at any electronics distributor. A CAT5 network cable
is recommended, and cable length may be up to 100’ (30m). Figure 90 shows the wiring
diagram of the extension cable.
1
2
3
4
7
8
9
5
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
6
TX Data
RX Data Data Out
Data In
GND GND
DB9 Female
To PC
DB15 Male
To Controller
FIGURE 89. PC to AX2550 RS232 cable/connector wiring diagram