BECKHOFF C1220 - Manual (Page 15)

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15 Software description of functions
Beckhoff Lightbus - PC interface card C1220
Software-RESET
The C1220 can be reset by means of this function. Besides reinitialization
of the fibre-optic ring, the controller and the dual ported RAM are also
reinitialized. Completion of RESET is acknowledged by the code word
(without Data Valid).
Argument Channel Length Function
0 1 2
Comment
Request 02 0x09
Reply 04 0x02 fe af
Fibre-optic fracture point test
A fracture point in the fibre-optic ring can be localized by this function.
Depending on the result, the test specifies the number of boxes in the ring
or the location of the fracture point.
Argument Channel Length Function
0 1 2
Comment
Request 02 0x0a
Reply 04 0x0a 00 nn No fracture point,
nn modules in the ring
04 0x0a 01 nn Fracture point before nn th-module before
the receiver input of the C1220
04 0x0a 01 ff Fracture point cannot be located (fracture
point before receiver input)
If the fracture point should be specified as not being capable of location, it
is probably located between the last module and the receive input of the
C1220.
Invalid function selection
If a function is requested via handshake channel 0 that is reserved or is not
available, it is acknowledged with the function 0x0ff, which contains the
invalid function number as Argument 0.
Example:
Argument Channel Length Function
0 1 2
Comment
Request 03 0x04 01 Request function 4
(reserved)
Reply 03 0x0ff 04