Parker HPD2N, User Manual, Page: 86 / 125

Parker Hannifin S.p.A. - S.B.C. Division HPD N User’s Manual
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[CMD4] = parameter read message; format:
[STX] [100+ADDR] [LUN] [PAR] [CHK]
[CMD5] = parameter write message; format:
[STX] [101+ADDR] [LUN] [PAR] [D0] ... [Dn] [CHK]
[CMD6] = byte parameter bit change message; format:
[STX] [110+ADDR] [LUN] [PAR] [D0] [D1] [CHK]
In this case (LUN=2) two bytes are transmitted for the data: the first byte is the mask
containing 0 in the positions of the bits to change and 1 in the other positions; the second byte
contains 1 in bit positions to be set to 1 and 0 in the other positions. The address PAR
corresponds to the parameter (byte) in which one or more bits is to be modified. If the
parameter is a word and the bit to be modified is among the first 8 (b0...b7): PAR =
parameter address; otherwise if the bit to modify is one of the upper 8 (b8...b15): PAR =
parameter a 1.
[CMD7] = parameter write broadcast message to all drives connected to the serial line;
format:
[STX] [11100000] [LUN] [PAR] [D0] ... [Dn] [CHK]
The address of peripheral device (ADDR) must be zero.
Notes:
- Parameters shown on the display with decimals must be treated as integer values, e.g.
978.5 will be read, and written, as 9785.
- All values preceded by the symbol $ are hexadecimal numbers.
- The value in square brackets is the basic unit (byte) of the message.
- To be considered valid all messages must be terminated within a clearly defined time
interval (time-out) which is a function of speed, and they must have correct parity and
checksum.
- The drive responds to data requests or transmission only if the message is received
correctly; if the message contains an error, no answer will be transmitted. The only
exception is message type 7, with which a datum is transmitted with a single message
addressed to all drives connected to the serial line.
Serial line initialisation and management
Drive serial communication can be enabled or disabled by means of bit b40.14.
The drive is factory set with b40.14=0, i.e. serial line disabled (default).
If you want to use the serial line first set the baud-rate in Pr.26; now set the serial address
in Pr.27; finally, enable serial communication by setting b40.14=1 and initialise using b42.3.
At this point you must save the configuration using command b99.15.