Epson Multi-mode Data Controller MFJ-1278B - Manual (Page 292)

MFJ-1278B MULTI-MODE OPERATIONAL COMMANDS
VISTICKS nnnn Mode: SSTV Default:0
Parameters:
nnnn 0<nnnn<65535
The VIsticks parameter specifies the number of pixels to send at the beginning of a SSTV
picture that will use the alternate VISTONES modem configuration list. After VISTICKS
pixels are sent, remaining picture data use the PIXTONES list.
Note that setting the VISTICKS command to its Default of 0, the VIS routine is disabled.
This command is significant only during transmit. The value is ignored in the FAX mode.
VISBREAK
[TVBREAKS-like list]
Invoke the TVBREAKS-like list by sending the letter 'V' to the MFJ-1278B, when the TNC
is receiving. Sending anything but 'V' causes the MFJ-1278B to use TVBREAKS.
To support VIS reception, the terminal program *must* first manually lock onto the signal
(send 'L'), where upon the TNC is free running and receiving according to the TVBREAKS
parameters. The terminal program should set VISTONES (the defaults may not be
appropriate) to detect 1100,1200,1300,and >= 1500 hz, and send 'V' to the TNC to begin
reception according to VISTONES. The terminal program must monitorr the data stream for
lock and VIS data. Upon detecting locck and acquiring VIS, the terminal program must then
send any character other than 'V' to restore the TNC and beegin ordinary reception.
VISTONES
PIXTONES-like list]
The tones specified by VISTONES are used in place of the PIXTONES values for the first
VISTICKS pixels of a transmitted picture.
Defaults:
Nibble Tone
0..10 1300Hz
11..14 1200Hz
15 100Hz