Parker LVD1 - Page 84

Parker Hannifin S.p.A. - Divisione S.B.C. LVD User’s Manual
84
Acyclic data write or parameter request from Master to LVD
Acyclic data write or request
Data length
7 bytes
Field Name
Cmd & Len Data Address Data
Contents
5 bit command and 3 bit length 16 bit data address 32 bit data
Identifier
ID2 ID1 ID0 - - - - - ID10
ID9 ID8 ID7 ID6 ID5 ID4 ID3
A2 A1 A0 X X X X X 0 0 0 0 1 0 0 A3
A0:A4 Slave LVD address (Pr27+1), valid values 1..15.
Data In the case of parameter writing, this portion contains the value of the
parameter.
In the case of modification of one or more bits, contains the mask of the bits to
be modified.
In the case of a parameter read request, this field is insignificant.
Data Address This is the address of the parameter involved in the operation (see the table in
the heading Serial addresses and parameter lengths).
Cmd & Len
Sub-field Value Significance
Cmd [0..4] 0 Read request
1 Write
2 SET bit Pr = Pr .OR. Data
3 RESET bit Pr = Pr .AND. (.NOT.Data)
4 TOGGLE bit Pr = Pr .XOR. Data
5 - 31 not used
Len [5..7] 0- 4 Number of significant bytes in Data field
Acyclic answer message to a parameter request, from LVD to Master
Data reply
Data length
5 bytes
Field Name
Addr & Spare Data
Contents
Pr27+1 32 bit reply data
Identifier
ID2 ID1 ID0 - - - - - ID10
ID9 ID8 ID7 ID6 ID5 ID4 ID3
A2 A1 A0 X X X X X 0 0 0 1 1 0 0 A3
A0:A4 Slave LVD address (Pr27+1), valid values 1..15.