Pentax DSI-200 Series User Manual page 147

For groups P0 to PF and A0 to AF, the high 16 bits of the
communication address indicate the group number and the low 16
bits indicate the parameter number in the group.
Example:
Communication address of P0-16 is F010H, where F0H represents
group P0 and 10H is the hexadecimal data format of serial number
16 in the group.
Communication address of AC-08 is AC08H, where ACH
represents group AC and 08H is the hexadecimal data format of
serial number 8 in the group.
2. When parameter data is written by means of communication
For groups P0 to PF, whether the high 16 bits in communication
address are 00 to 0F or P0 to PF is decided by whether the high 16
bits are written to EEPROM. The low 16 bits indicate parameter
number in the group.
Example:
P0-16: If it need not be written to EEPROM, communication
address is 0010H. If it needs to be written to EEPROM,
communication address is P010H.
For groups A0 to AF, whether the high 16 bits in communication
address are 10 to 4F or A0 to AF is decided by whether the high
16 bits are written to EEPROM. The low 16 bits indicate
Parameter number in the group.
AC-08: If it need not be written to EEPROM, communication
address is 4C08H. If it needs to be written to EEPROM,
communication address is AC08H.
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