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Pin Descriptions
Data Lines
The encoder has eight data lines, D0 through D7. when the SEND line goes
high, the states of these lines are recorded, encrypted for transmission,
then reproduced on the outputs of the decoder.
SEL_BAUD
This line is used to select the baud rate of the serial data stream. The
state of the line allows the selection of one of two possible baud rates, as
shown in Figure 10.
Baud Rate Selection Table
SEL_BAUD
0
1
Baud Rate (bps)
4,800
28,800
Figure 10: Baud Rate Selection Table
The baud rate must be set before power-up. The encoder will not
recognize any change in the baud rate setting after it is on.
SEL_TIMER
This line is used to set the length of inactive time before PIN reentry is
required.
GND
These lines are connected to ground.
KEY_IN
This line is used to input the key from the decoder
TX_CNTL
This line goes high when the SEND line goes high and low when the
SEND line goes low. This can be used to power up external devices, such
as a transmitter, when the encoder is sending data, and power it down
when the encoder is asleep. It can also be used to drive a LED for visual
indication of transmission.
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