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LICAL-DEC-HS001

HS SERIES DECODER DATA GUIDE

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DECODER TX ID

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.

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.

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.

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.

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).

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.

GET COPY MODE

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.

Receive Mode ON for as long as the decoder is receiving valid data.

Create Key Mode

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.

Learn Mode

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.

Erase Mode

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.

Send Copy Mode ON for the duration of this mode.

Get Copy 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.

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

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