LICAL-ENC-MS001 查看數據表（PDF） - Unspecified

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LICAL-ENC-MS001

MS Series Encoder Module Data Guide

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Encoder Operation

Upon power up, the encoder will set the baud rate based on the state

of the SEL_BAUD lines and then check the SEND line. If it is high, the

encoder will go directly to Send Mode. Otherwise, it will pull the TX_CTNL

line low and go into low-power sleep mode. It will remain asleep until either

the CREATE_ADDR or SEND line goes high. These lines will place the

encoder in either Create Mode or Send Mode as described in the following

sections.

Create Mode

The Create Mode allows the generation of a unique address to ensure the

security of transmission and prevent unintentional operation of devices. The

MS encoder allows 16,777,216 (224 ) possible addresses. Creating the

address is remarkably straightforward.

When the CREATE_ADDR line is pulled high, the encoder randomizes

the Code Word continuously until the CREATE_ADDR line is pulled low.

Once the encoder registers the low line, the Code Word is saved and the

encoder will begin to toggle the MODE_IND line. This will indicate to the

user that the encoder is ready to accept the Control Permissions. Control

Permissions are set by activating the data lines that the user wants the

encoder to have the authority to operate. Pulling the CREATE_ADDR line

high again will cause the encoder to save the Control Permissions and go

back to sleep. The Code Word will be sent with every transmission when

the SEND line is pulled high, but the encoder can only activate the decoder

data lines that are authorized by the Control Permissions.

The Code Word is learned by an MS Series decoder by placing the

decoder into Learn Mode and sending a transmission from the encoder.

Please refer to the MS Series Decoder Data Guide for full details.

The CREATE_ADDR line can be tied to a button or contact point accessible

by the user. With a simple press, the user will generate a unique address

that should never again require changing. Some designers may prefer to

set a code during production and not provide for change by the user.

The MODE_IND line allows for the connection of a LED or other device to

indicate to the user that the encoder is in Create Mode. Once the CREATE_

ADDR line goes high and the encoder enters Create Mode, the MODE_IND

line will go high and stay high until the CREATE_ADDR line goes low. The

MODE_IND line is capable of sourcing up to 25mA of current.

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