Design and Implementation of a Truly-Wireless Real-Time Sensor/Actuator Interface for Discrete Manufacturing Automation - Networked Embedded Systems - page 723

Frequency

WISA frame =

2048 µS

f DL

012 3 .. .. E F

f UL 1

f UL 4

012 .. .. D E F

012 .. .. D E F

Time

FIGURE . WISA TDMA/FDD/FH pattern. Dotted lines connect downlink/uplink slots allocated to one
sensor/actuator. (TX/RX-turnaround time  µs, see Figure .). (From Scheible, G., Dzung,

D.,Endresen,J.,andFrey,J.-E., IEEE Ind. Electron. Mag. , , , . With permission.)

= doubleslots =

Dslot

128 bit

Downlink

Data.
#6.

Cell_
id.

Data.
#1.

Data.
#2.

Data.
#3.

Data.
#4.

Data.
#5.

Data.
#7.

Data.
#8.

Dslot
#.

Preamble CRC.

Slot
64 bit

Slot
64 bit

Uplink

Pre-
amble.

Pre-
amble.

Cell_
id.

Cell_
id.

Data. Data.

CRC. CRC.

FIGURE .  µs. Double slots

may be used on the uplink for higher payload data profiles. (From Scheible, G., Dzung, D., Endresen, J., and Frey, J.-E.,
IEEE Ind. Electron. Mag. ,,,.Withpermission.)

WISA slot format: downlink double slot duration =  µs, uplink slot duration =