Technical Data
7.3.4 Joystick Y-cable
The joystick Y-cable (C-819.20Y) maps the second joystick-axis (Y) position and
button signals to the joystick inputs for the second controller as shown below:
Joystick
Pin
Signal Controller 1 (X)
Pin
Controller 2 (Y)
Pin
1 GND 1
1
2 Button 2: 0 or 3.3 V 6
3 Vcc (3.3 V supply input) 3.3 V output n.c.
4 X-axis position, 0 to 3.3 V 4
5 Y-axis position, 0 to 3.3 V
4
6 Button 1: 0 or 3.3 V 6
Fig. 17: C-819.20Y joystick Y-cable with 2 controllers
7.3.5 RS-232 Connectors
Connector Labels: RS-232 IN and RS-232 OUT
Connector Types: Sub-D, 9-pin, male for OUT, female for IN
The IN and OUT lines are permanently bussed together, straight-through. Only
when the USB interface is active, does the controller assert signals on the RxD
(receive) line, pin 2, otherwise that line is driven by the host PC only. This is the
reason an RS-232-only network may be limited to as few as 6 units.
Note that the controller RS-232 bus is wired as a DTE and, if connected to a PC,
requires a cross-over (null-modem) cable
www.pi.ws C-863 MS173E Release 1.2.7 Page 37
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