DECODER TX ID
GET COPY MODE
Upon receipt of the first valid packet, the decoder will output a binary number on
the KEY_OUT line that corresponds to one of the learned transmitters. It will
output the number only once, as soon as the first packet is accepted. An
encoder’s key, a 40-bit counter, and permissions are stored in one of 15 memory
locations within the decoder. The decoder is able to output an 8-bit binary
number that corresponds to the memory location of the encoder’s information.
The first encoder that is learned will be assigned 1, the second will be assigned
2 and so on. Once assigned, it is an easy task for a software program to read
that number and associate it with a particular encoder. This makes applications
such as logging access attempts simple.
Get Copy Mode is entered when valid data is present on the COPY_IN line. The
decoder will read the User Data from another decoder and save it in non-volatile
memory. If the decoder is made into a copy of another decoder, it will not have
the ability to send the copy or to create new keys. All of the User Data will need
to be erased before the decoder can create new keys. This is done by holding
the LEARN line high for ten seconds.
DECODER MODE_IND DEFINITIONS
The MODE_IND line is the primary means of indicating the state of the decoder
to the user. The table below gives the definitions of the MODE_IND signals.
The ID will be asynchronously output as an eight-bit binary number at the baud
rate selected by the SEL_BAUD line. For example, if the SEL_BAUD line is
grounded and the first encoder that the decoder learned sends a signal, then
once the first packet is received, the decoder will output ‘0000 0001’ (binary 1)
at 2,400bps on the KEY_OUT line.
Receive Mode
ON for as long as the decoder is receiving valid data.
ON during the key generation process and OFF when created.
Then ON for 1 second after the key has been successfully
transferred and the user profile is saved. After the 15th user
profile has been saved, it will blink* 5 times. The next user
profile will overwrite the first.
Create Key Mode
Application Note AN-00156 shows an example program that will read this
number and display it on an LCD screen. The code is written in C and is well
documented so that it can be easily modified for a specific application. The code
and include files can be downloaded as a .zip file from the Linx website.
ON while the LEARN line is HIGH until taken LOW to enter
Learn Mode, then it flashes* for 15 seconds until time-out or
until the LEARN line goes HIGH again.
Learn Mode
SEND COPY MODE
The HS Series decoder has the ability to send a copy of all of the learned
encoders to another decoder. This makes it possible to use the same transmitter,
encoder, and Control Permissions in multiple locations. Send Copy Mode is
entered when the SEND_COPY line and the LEARN line are taken high at the
same time. Once in this mode, the decoder will output all of its User Data on the
KEY_OUT line for asynchronous transfer to another HS Series decoder. The
decoder that receives the User Data becomes a copy and will lose the ability to
create a key and send a copy. It can only set Control Permissions until its
memory is erased, at which point it will regain full functionality.
ON while the LEARN line is held HIGH for 10 seconds and
Erase Mode is entered, then it turns OFF. It turns back ON
again for 2 seconds when erase is completed.
Erase Mode
Send Copy Mode
Get Copy Mode
ON for the duration of this mode.
Blinks* each time a user profile has been successfully
transferred and saved. If all user profiles have been
successfully received, it will blink* twice.
The two decoders will need to be connected together with some method of
transferring asynchronous serial data, such as a wire or short-range infrared. RF
is not recommended for this transfer because it can represent a security risk,
since RF will broadcast in all directions. A wire is the most secure method of
transfer. Simply connect the KEY_OUT of the originating decoder to the
COPY_IN line of the receiving decoder and connect the COPY_IN of the
originating decoder to the KEY_OUT of the receiving decoder. Then connect the
ground lines together and send the data (refer to Figure 11).
Disable Send Copy Blinks* three times when Send Copy is disabled.
*Blink = ON for 1sec and OFF 1/2sec
*Flash = ON for 200ms and OFF for 200ms
Table 5: HS Series Decoder MODE_IND Definitions
The Send Copy feature can be disabled by setting the SEND_COPY and
CREATE_KEY lines high when the decoder is powered on. The MODE_IND line
will blink three times to indicate that this has taken place. The decoder will not
be able to send a copy of its User Data again until its memory is cleared.
Page 12
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