discovered something while playing with this mode
here is the grayscale a4 preview (same than b/w a4 preview)
>>> dev.write(0x3,"\x03\x09\x01"); dev.read(0x85,100)
<<<array('B', [0])//scanner response
>>> dev.write(0x3,"\x03\x0D\x0B"); dev.read(0x85,100)
<<<array('B', [126, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0])//scanner response
>>> dev.write(0x3,"\x03\x0C\x11\x00\x00\x00\x01\x02\x05\xFF\x00\x00\x00\x00\xE8\x13\x68\x1B");
>>>
>>> dev.write(0x3,"\x03\x0B\x08"); dev.read(0x85,100)
<<<array('B', [0, 10, 180, 13, 244, 9, 180, 13]) //scanner response
>>> dev.write(0x3,"\x03\x08\x04\x00\x00\x00\x00\x08\x89\x00\x01"); //scanner
>>> give a 64000 data packet
dev.write(0x3,"\x03\x0E\x04\x00\x00\x00\x00\xFA"); dev.read(0x85,100) //add
a 64000 data packet
the \x03\x0E\x04\x00\x00\x00\x00\xFA sequence is executed 32 times
after that it send \x03\x0E\x04\x00\x00\x00\x00\xBE and receive only 48640
data packet
then return to 32 times \x03\x0E\x04\x00\x00\x00\x00\xFA 64000 data
until the end
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