Parker Compax3 Fluid T40

Communication
C3F_T40
358 192-121102 N04 June 2008
Order and response processing
Order/response identifications are defined so that it is apparent from the
identification which fields of the PKW interface (IND, PWE) also need to be
evaluated. To this may be added the distinction between parameter value and
parameter description.
Order
identification
Order Master → Compax3
response identification
Compax3 → Master
0 No order 0
1 Request parameter value 1,2
2 Change parameter value (word) 1
3 Change parameter value (double word) 2
6 Request parameter value (array) 4,5
7 Change parameter value (array of word) 4
8 Change parameter value (array of
double word)
5
9 Request number of array elements 6
14 Change object 14
15 Request object 15
Response identifications 7 and 8 are used for negative acknowledgements for
problems.
Sequence
 The master transfers an order to a Compax3.
 The master repeats this order at least until a response is received from Compax3.
This procedure ensures the transfer of orders /responses on the user level.
 Only one order is ever being processed at a time.
 Compax3 continues to make the response available until the master formulates a
new order.
 For responses containing parameter values, Compax3 always responds upon
repetition with the current value (cyclic processing). This applies to all responses
to the orders ”Request parameter value”, ”Request parameter value (Array)’” and
”Request object”.
 The PWE transfer of word sizes takes place with byte 7 and 8, while the transfer
of double word sizes takes place with byte 5 through 8.
Explanation of response identification
Response
identificatio
n
Response Compax3 → Master
0 No response
1 Transfer value (word)
2 Transfer parameter value (double word)
4 Transfer parameter value (array of word)
5 Transfer parameter value (array of double word)
7 Order cannot be executed (with error no..)
8 No user level for PKW interface
9 Reserved
10 Reserved
14 Object value transferred
15 Object value transferred