Technical data

17.6 Calculation of the Target Rotation Time (TTR)
The TTR is dependent to a great extent on the data rate and the number of
active stations (NAS).
17.6.1 Overview
Parameter Explanation
Retry-Counter
Number of attempts to re-transmit when
transmission unsuccessful.
Slot-Time*
Wait to recieve time (or wait for reaction time).
This is the time the sender(initiator) of a request
has to wait until the addressed station reacts.
It does not matter whether the frame is a message
or the token frame.
Range: 1....65535 bit times
Setup-Time
"Dead time": this is the maximum time between an
event (e.g. reception of characters or end of an
internal monitoring time) and the reaction to the
event.
Range: 1....255 bit times
Minimum Station
Delay*
Maximum Station
Delay*
Minimum time between receiving the last bit of
a frame and sending the first bit of the next
frame.
Range: 1....255 bit times
Maximum time between receiving the last bit of
a frame and sending the first bit of the next
frame.
Range: 1....255 bit times
Target Rotation
Time *
Preset token rotation time. This time is compared
with the actual token rotation time that has elapsed
when the token is received. The result of the
comparison decides whether and which frames
can be sent by the station.
Range: 1....16777215 bit time units*.
You must select this time to match the
requirements of the bus system.
* Times are entered as bit times. This is the time required
to send one bit (reciprocal of the data rate in bps)
Table 17.12 Overview: INIT Parameters
Appendix B8976060/02
Volume 1 17 - 24