Epson Multi-mode Data Controller MFJ-1278B - Manual (Page 257)

MFJ-1278B MULTI-MODE OPERATIONAL COMMANDS
PIXTONES n Mode: FAX/SSTV Default: (see below)
Parameters:
n = $aa,$bb,$cc,.........$mm,$nn,$ss
The PIXTONES are arranged in the following format:
White Lt gray Dark gray Black
area area area area
$aa, $bb, $cc, $dd, $ee, $ff, $gg, $hh, $ii, $jj, $kk, $ll, $mm, $nn, $ss
Syn _________|
The default PIXtones values are as follows:
$BE, $BB, $BD, $B9, $BE, $BA, $BC, $B8, $B3, $B5, $B6, $B2, $B0, $AD, $9D, $BE
The Pixtones command serves the same function as in TVBreak, but is for transmitting of the
SSTV and FAX pictures.
The brightness of the transmitted SSTV and FAX pictures can be adjusted by using the
PIXTONES command.
Note that in transmitting 4 or 8 gray-levels of SSTV or FAX (16LEVELS command is OFF),
the MFJ-1278B will automatically select only four (4) or eight (8) of the PIXTONES values
you have chosen. PIXTONES does not affect 2 levels FAX transmitting.
PIXTONES determine which levels of gray that the MFJ-1278B will transmit. MFJ-1278B's
multi-gray levels board is capable of transmitting up to 19 tones. However, only a total of 16
tones can be selected by the PIXTONES command.
To use PIXTONES the terminal program which you are using on your computer must be able
to support the raw data format required by the MFJ-1278B. See Chapter 4 in this manual
under "Multi-level FAX/SSTV Transmitting" for more details about the raw data format.
The 19 tones which can be produced by the MFJ-1278B FAX/SSTV modem (in Hz) are:
1100, 1200, 1300, 1500, 1550, 1600, 1650, 1700, 1750, 1800, 1850, 1900, 1950, 2000,
2050, 2100, 2150, 2200, and 2250.
The tone being transmitted determines the shade of gray in the picture. The higher the tone
the darker the gray. The 1100, 1200, 1300 and 1500 tones are for the sync, 1550 Hz is white