Calibre UK FoveaHD, Manual

Page: 34 / 37

©Calibre UK Limited issue 1.2 December 2013 E&OE Page 33
i. AP - always start the application string with these characters
ii.
B - this is the function identifier, in this case:- B = Get a value
iii. AAC8 – this is the parameter identifier, in this case:- AAC8 = Front panel backlight brightness
iv. AC – this is the attribute, in this case:- AC = Minimum valid parameter value
v. AAAAAA - is the enquiry value in BASE64 alphabet
vi. A - always end the string with this character
The answer will be returned OK:AAAAAA
APB
AAC8 AD AAAAAA A to ask for the maximum valid value
i. AP - always start the application string with these characters
ii.
B - this is the function identifier, in this case:- B = Get a value
iii. AAC8 – this is the parameter identifier, in this case:- AAC8 = Front panel backlight brightness
iv. AC – this is the attribute, in this case:- AD = Maximum valid parameter value
v. AAAAAA - is the enquiry value in BASE64 alphabet
vi. A - always end the string with this character
The answer will be returned OK:AAAAD/
The Base64 number system is outlined in the API manual in section 3.4.1
So the valid range of settings for this function are between AAAAAA and AAAAD/ (0 – 255)
If the user now sends the command APCAAC8AEAAAABBA, as described in the previous examples in
this guide, the LCD window will be set to brightness 65 of 255.