Industrial Communication Systems

50-6 Industrial Communication Systems

• Data are sent from one participant to another (peer-to-peer-topology). As in the rst scenario, the

receiver

must always be capable of receiving.

•

Data are sent from the PAN coordinator to one participant. e participant asks periodically

for data at the coordinator. e coordinator sends an ACK and the data if something is avail-

able, otherwise it sends a null packet. e coordinator is always in receiving mode when not

transmitting.

50.5.2.2

Slotted Mode

In

the

slotted

mode,

there

is

a

superframe

structure

coordinated

by

the

PAN

coordinator

as

the

trans-

mitter

of

periodic

beacons.

e

superframe

is