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MicroMet Manual Pg. 11

Communications Cycle

MicroMet MBTU10X operates as a power conserving remote node in a ‘star’ network

topology. The network protocol is implemented with a ‘probing Master Station’. This

means that a MicroMet talks only to the Master Station, and that it communicates only in

response to a probe from the Master Station. In this configuration, the Master Station is

continually probing in an attempt to initiate communication with any remote node

(MicroMet). Meteor Burst phenomena provides a type of automatic time division

multiplexing such that it is unusual for multiple remote nodes to ‘see’ the Master

Station’s probe simultaneously.

From the MicroMet’s perspective, it’s role is to listen for the probe. If MicroMet receives

a valid probe, then it will attempt to respond by transmitting a data message from it’s

queue. At the end of it’s transmit cycle, MicroMet listens for an acknowledgement

(ACK), which the Master Station will send in response to the data message. If the ACK

is received, MicroMet will dequeue the data message, and return to the listening state. If

MicroMet has no messages enqueued for delivery to the Master Station, it will not

transmit a response to the probe.

Master Station MicroMet

Probe --------------------------------------------------!

# -------------------------------------------- Data Message

ACK ------------------------------------------------ !

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Campbell PC208W Manual de usuario Pagina 14