Burst Electronics VS4x1(R) - Manual (Page 6)

4 VS4x1 & VS8x1 Video Switch
To disable the follow mode for the VS4x1, remove the front
panel, and slide the top cover off. Locate the four position
DIP switch labeled S6. Move switch #1 from the closed
(down) position to the open (up) position. The VS4x1
switcher will not send data to the AS4x1R or echo data to
the computer.
The follow mode function can be re-enabled two ways,
front panel control or internal jumper. Setting DIP switch S6
#1 to closed (down). For front panel control, press and hold
video switcher channel #1 while power is turned on. This
method operates in follow mode until power is cycled,
follow mode will then be disabled.
To disable follow mode on the VS8x1R, remove the front
panel and slide the top cover off. Located behind the front
panel is a shunted jumper (W9). Remove this shunt.
Replace the top cover and front panel. The video switcher
will not echo data to the computer, or send data to the
AS4x1R.
The follow mode function can be re-enabled two ways.
Reinstall W9 or front panel control. For front panel control,
press and hold video switcher channel #1 while power is
turned on. This method operates in follow mode until power
is cycled, follow mode will then be disabled.
If follow mode is off, the video switch does not echo via the
RS232 port when the channel switches are pressed. If the
follow mode is on then the switch echoes the commands.
Example: with follow mode on when channel 2 is pressed,
then B2 is sent out the RS232 port.
If the commands to the video switch are via the RS232 port
(vs the front panel) then the switch always echoes back the
command. Example: regardless of whether follow mode is
on or off, if V2 is sent to the video switch then it echoes
back V2. There is one case where in the echo returned is
different. If sync detect is on and an inactive channel is
selected the video switch echoes NV (no video). If sync
detect is off, then there is no echo for inactive inputs.