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Legal Considerations

If the transcoder is to be used with a transceiver operating in the 260MHz

to 470MHz ISM band in the United States under Part 15.231, then there

are some legal requirements that need to be considered. The FCC requires

that the transmission control something, so the transcoder cannot be

used simply for passing data. The data lines and CONFIRM line must be

connected to something that turns on or off, such as a motor, LED, buzzer,

or display. Application Note AN-00128 goes into this in detail.

The transcoder has the ability to be automatically activated with the Write

Status Inputs command through the SIE. The FCC requires that any

automatic transmission cease within 5 seconds of activation. The MT

could exceed this time depending on the baud rate used, the options that

are enabled, and the number of packets that are sent. Figure 19 shows

the packet time at each baud rate with the various options enabled or

disabled. The designer needs to be aware of the time depending on the

options that are in use and adjust the packet counter in the command to

ensure that the total time does not exceed 5 seconds. Application Note

AN-00157 goes into the serial commands in more detail and Application

Note AN-00125 goes into the FCC regulations under Part 15.231.

Helpful Application Notes From Linx

It is not the intention of this manual to address in depth many of the issues

that should be considered to ensure that the modules function correctly

and deliver the maximum possible performance. As you proceed with your

design, you may wish to obtain one or more of the following application

notes which address in depth key areas of RF design and application of

Linx products. These application notes are available online at

www.linxtechnologies.com or by contacting Linx.

MT Series Transcoder MODE_IND Deﬁnitions

MODE_IND Signals Description

Receive Mode

ON for as long as the transcoder is receiving data from a

learned user. This only indicates authorized data reception, not

status output activation.

Create Address Mode

ON during address generation while the CRT/LRN line is HIGH,

then it ﬂashes* when the CRT/LRN line is taken LOW. Once the

15-second timer expires or the CRT/LRN line is asserted again,

the MODE_IND line turns OFF.

Learn Mode

ON while the CRT/LRN line is held HIGH until taken LOW to

enter Learn Mode, then it ﬂashes* for 15 seconds until the timer

expires or the CRT/LRN line is asserted again. If the 60th user

proﬁle has been saved, it blinks* 5 times to indicate the next

user proﬁle will overwrite the ﬁrst.

Erase Mode

ON while the CRT/LRN line is held HIGH for 10 seconds and

Erase Mode is entered, then it turns OFF until the CRT/LRN

line is released. It then turns back ON again for 2 seconds to

indicate erase completion.

Serial Interface Mode

OFF while a command is being received (SER_IO = input) and

ON while an ACK/reply is being sent (SER_IO = output).

*Blink = ON for 1sec and OFF 250ms

*Flash = ON for 65ms and OFF for 65ms

Transcoder MODE_IND Denitions

The MODE_IND line is the primary means of indicating the state of the

transcoder to the user. The table below gives the deﬁnitions of the

MODE_IND signals.

Figure 22: MT Series Transcoder MODE_IND Deﬁnitions

Helpful Application Note Titles

Note Number Note Title

AN-00100 RF 101: Information for the RF Challenged

AN-00125 Considerations for Operation Within the 260–470MHz Band

AN-00128 Data and Bidirectional Transmissions under Part 15.231

AN-00157 Connecting to the Serial Interface on the MT Series Transcoders

AN-00310 Encoder and Decoder Comparison

AN-00320 The Basics of Remote Control and Remote Keyless Entry

Figure 23: Helpful Application Note Titles

1 2 ... 11 12 13 14 15 16 17 18 19 20 21

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