Riello UPS MultiCOM 401 User Manual
Page 11
11
PKW-
PART
The parameter part (PKW) is fixed to 4 words and can be used for reading and/or updating the
parameters in the application one by one. Requests and responses use the predefined handshake
procedure.
The PKW is further divided into three parts:
1. PKE: Parameter ID (2 bytes);
2. IND: Sub-index (2 bytes), 2nd byte isn’t used and should be set to 0;
3. PWE: Parameter value (4 bytes).
PKW
PKE
Parameter ID
IND
Sub-index
PWE
Parameter value
Word 0
b15 . . . . . . . . . . . . . . b0
Word 1
b15 . . . . . . . . . . . . . . b0
Word 2
b15 . . . . . . . . . . . . . . b0
Word 3
b15 . . . . . . . . . . . . . . b0
PKE consists of three parts:
1. AKA: command/response identificator (4 bits);
2. SPM: toggle bit, not used (1 bit);
3. PNU: parameter number (11 bits).
PKE
b15 b14 b13 b12
b11
b10
b9
b8
b7
b6
b5
b4
b3
b2
b1
b0
AKA
SPM
PNU
PNU parameters:
1
÷799 are UPS PARAMETERS;
800
÷899 are GATEWAY INTERNAL PARAMETERS;
900
÷999 are PROFIDRIVE STANDARD PARAMETERS.
AKA field meanings (master → slave)
Value
Function
Ack+
Ack-
Note
0
No request
0
-
1
Request parameter value
1
7
2
Change parameter value (word)
1
7/8
3
Change parameter value (long word)
2
7/8
4
Request description element
3
7
not used
5
Change description element
3
7
not used
6
Request parameter value (array)
4
7
7
Change parameter value (array word)
4
7/8
8
Change parameter value (array long word)*
5
7/8
not used
9
Request number of array elements
6
7