Technical data

Default SAP: When an L2 frame is received without a destination
SAP number, the layer 2 firmware automatically selects
the default SAP.
Maximum no. of
retries
Call repetition counter for unsuccessful transmission. It
specifies how often a call is repeated by the initiator
when no correct acknowledgment frame has been
received (range of values: 1 to 8).
Medium
redundancy
(Range of values: no redundancy)
Bus parameter data:
Slot time (TSL): Monitoring time during which the transmitter (initiator) of
a frame waits for an acknowledgment from the
responder. When this time elapses, transmission is
repeated according to the "maximum no. of retries"
value (range of values: 80 to 4095 bit times, however at
least 2 ms!) (see Table 6.1).
Set-up time (TSET):Minimum "dead time" between the reception of an
acknowledgment before sending a new call frame by
the initiator (range of values: 1 to 255 bit times
*
) (see
Table 6.1).
Minimum station
delay (min TSDR):
(Minimum protocol processing time)
A remote responder must not send an acknowledgment
of a received call frame until this time has elapsed. The
smallest time between receiving the last bit of a frame
before sending the first bit of the next frame (range of
values: 0 to 255 bit times
*
) (see Table 6.1).
* Bit time
This is the time required to transmit a bit (reciprocal of the data rate in bps). The unit "bit time" has the advantage that the
parameters are not dependent on the transmission speed used.
To calculate the time in milliseconds from the number of bit time units, use the following formula:
time (in milliseconds) = number of the bit time units / transmission rate (in Kbps).
Basics of Configuration B8976060/02
Volume 1 6 - 30