User's Manual

Chapter Three Operation
Man_905UD_2.0.doc Page 21
Establishing a Communications Link
Master Unit Slave Unit
• Listen to ensure channel is clear
•
If clear, transmit “connect”
message
• Radio TX LED flashes
------------------->
• Receives message
• Radio RX LED flashes
•
Check system and destination
address
•
If OK, set DCD LED and
output
• Radio RX LED flashes
<-------------------
•
If message OK, transmit back
an ACK message.
• Radio TX LED flashes
•
Acknowledgment received okay
communication link established
• Set DCD LED and output
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