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FCI/Berg is one manufacturer of connectors that may be used to connect the flex connector
tails from the keypad to header J6 on the Keypad/Display interface. Their connectors,
called series 65801 “Clincher,” are available in various widths and may be purchased
online from Mouser Electronics .
It is expensive to develop a custom keypad, particularly if the anticipated volume will be
low. A good source for generic keypads is Xymox Technologies Inc. 9099 W. Dean Rd.,
Milwaukee, WI 53224. Their available keypads can be viewed online by visiting their
Web site at www.xymox.com and searching for “stock membrane switches.”
6.3.1.2 Liquid Crystal Displays
A 2 × 8 IDC header at J4 and a 1 × 16 socket at J5 with a 0.1" pitch provide the interface
for character liquid crystal displays either with or without a backlight. A standard signal
pin assignment is used by most manufacturers for each of the two types of connectors. The
command set is the same across all character liquid crystal displays.
Pins 15 and 16 are reserved for the backlight function. In some cases when there is no
backlight or the backlight is internal to the liquid crystal display, the manufacturer some-
times uses a 1 × 14 in-line or a 2 × 14 dual-row connector. In this case, pins 15 and 16 on
the Keypad/Display interface are not used, and you need to only connect pins 1–14 to the
corresponding pins on the liquid crystal display.
6.3.2 LEDs
The RabbitNet Keypad/Display interface has five status LEDs: Backlight , Activity ,
Alive , Microprocessor Bad , and Power Good .
The Backlight LED at DS4 turns on to indicate that the backlight was turned on by the
rn_dispBacklight() software function call.
The Activity LED at DS2 indicates network activity in that data are being transferred
between the Keypad/Display interface and the master.
The Alive LED at DS5 blinks continuously once the onboard microprocessor has per-
formed its self-tests and is running properly. The microprocessor is not working properly
if this LED remains either on or off.
The red Microprocessor Bad LED at DS3 indicates the status of the RabbitNet Keypad/
Display interface. Following a reset, DS4 will be ON and will remain ON while the micro-
code on the onboard microprocessor performs its self-tests. This LED is turned off if the
self-test completes successfully, and can subsequently be user-controlled in the application.
The green Power Good LED at DS1 indicates when power is applied to the RabbitNet
Keypad/Display interface and that Vcc is above 3.6 V. The LED turns off when the Rab-
bitNet Keypad/Display interface is being reset.
6.3.3 Buzzer
An audible buzzer can be turned on in software for variable intervals of time.
124
RabbitNet Peripheral Cards
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