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(6-6) Setting of program page
The setting operations for the program pages are roughly divided into 2 groups: save (writing the current setting into the
program page) and load (reading out the setting that was previously saved in the program page as the current setting).
More specifically,
“save” means overwriting the new setting that was changed from the current one onto one of the program
pages after turning on the power while
“load” means the opposite operation that is reading out the setting saved in one of
the program pages as the current setting.
[Terminology] Program page item
… Set items which are saved for each program page (A to F). Program page items
contain Flag register(FR), MGC gain set value, AGC gain set value, Offset set value,
Directly designated value of shutter speed and Electronic shutter table etc..
● Automatic loading at power-on
When the power is turned on, the camera automatically loads the setting
stored in one of the program page from
“A” to “F”, which determines the
operation of the camera.
The program page of which setting is automatically loaded is determined by
the position of the (hypothetical) mode switch at the time of power-on.
(Note) Note that the program page
“A” is automatically loaded at the position of
other than “B” to “F”.
(Note) This saving operation must be performed to keep the new setting
effective for later use after changing it.
●
Command
“WA” to “WF”
Function: Command for saving in program page (Write into page memory A to F)
Transmission from host: STX
: “W” : “A to F” : ETX
Return by camera:
STX : ACK : ETX (transaction completion) or STX : NAK : ETX (transaction rejection)
※
The current set values of program page items are saved into nonvolatile ROM area in specified page(A to F). .
●
Command
“LA” to “LF”
Function: Command for loading(reading out) program page (Load from page memory A to F)
Transmission from host: STX
: “L” : “A to F” : ETX
Return by camera:
STX : ACK : ETX (transaction completion) or STX : NAK : ETX (transaction rejection)
※
The set values of program page(A to F) which are saved in nonvolatile ROM area are loaded and reflected in the current
operation.
Position of
mode switch
Automatically loaded
program page
A
Program page A
B
Program page B
C
Program page C
D
Program page D
E
Program page E
F
Program page F
Program page A
Program page B to E
Program page F
C urrent s etti ngs
T he c amera operat es on i nf ormati on of
the c urrent s etti ng i n RA M
Lost at power- off
Effective even after power-off
Load
Save
Eac h c ontent of program page i tems
Eac h c ont ent of program page i tems
Conceptual diagram of saving and loading operations
[Explanation] Correlation between current setting and program page
The setting information saved in the program page is automatically read out from nonvolatile ROM and
written into internal RAM (volatile memory) in accordance with the (hypothetical) mode switch data (A to F)
when the camera is turned on, and that determines the operation of the camera as the current setting.
When the setting of a mode is changed by serial command , the older one is overwritten, and the new setting
is temporarily effective as the operation setting for the camera until the power is turned off. The new setting
in the program page on RAM, however, is lost when the power is turned off, and the old setting before
power-on will be effective for the operation of the camera.
Accordingly, it is absolutely necessary to write the new setting in one of the program pages from
“A” to “F” to
save it.
The setting saved in the program page can be read out for use by the loading operation (including automatic
load at power-on) as described later.
