CIRCUIT DESIGN LMD-400-R Operation Manual - Page 14

Browse online or download pdf Operation Manual for Transceiver CIRCUIT DESIGN LMD-400-R. CIRCUIT DESIGN LMD-400-R 20 pages. Uhf narrow band multi channel transceiver 438-442/458-462 mhz

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CPU

Pow er on

LMD-400

STD-302

Power on

#:3

Pow er on

RXSEL

#:1

#:2

#:4

CPU control,

CH change

Data rec.

Timing

TXSEL

Data transmit

#:1 Reset control CPU

#:2 Initialize the port connected to the module.

#:3 Supply pow er to the module after initializing CPU.

#:4 RFchannel change must be performed in receiving mode.

OG_LMD-400-R-AB_v11e

Figure 3: Timing diagram for STD-302

Status immediately after pow er comes on.

Receiv e mode

activ e period

Data #:5

Check LD signal

40 ms

5 ms

LMD-400

Normal status

Channel change

Receiv e mode

activ e period

#:4

Data #:6

Check LD signal

10 to 20 ms

Transmit mode

activ e

5 ms

#:5 40 ms later, the receiver can receive the data after changing the channel..

#:6 10 to 20 ms later, the receiver can receive the data after changing the channel.

#:7 5 ms later, the data can be received if the RF channel is not changed.

OPERATION GUIDE

No channel change

Receiv e mode

activ e period

5 ms

Data #:7

Check LD signal

Transmit mode

activ e

5 ms

Activ e period

#:4

Circuit Design, Inc.