ELPRO 805U Manual do Utilizador descarregar pdf (Página 22)

Chapter Three Operation

Man_805U Rev 1.9 Page 23

Successful Communications

Source Module

Destination Module

• Serial data is received

• Serial RX LED flashes

•

Listen to ensure channel is

clear

• If clear, transmit message

• Radio TX LED flashes

-------------->

• Receive message

• Radio RX LED flashes

•

Check system and destination

address

• If OK, check error-check

•

• Radio RX LED flashes

<--------------

• If message okay, transmit back

an ACK message.

• Radio TX LED flashes

•

Acknowledgment received

okay - communication

complete

• Serial data is output

• Serial TX LED flashes

Unsuccessful Communications

Source Module

Destination Module

•

Listen to ensure channel is

clear

• If clear, transmit message

• TX LED flashes

------------->

• Receives message

• RX LED flashes

•

Check system and destination

address

• If incorrect, transmit no message

and no serial output.

• No ACK received

• Retry up to four times

------------->

• If no ACK message received

after five attempts

•

“NO CARRIER” message

sent to host

• DCD signal and DCD LED

reset

1 2 ... 17 18 19 20 21 22 23 24 25 26 27 ... 55 56

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