Sony FCB-EX2700P Technical Manual page 15

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Synchronization methods
Internal and external synchronization are available;
VISCA Commands allow you to switch between them.
I nternal synchronization

An internal vibrator inside the camera generates a
synchronizing signal as a basic oscillator.
NTSC=59.94 Hz
PAL=50 Hz
E xternal synchronization (V-Lock

Synchronization )
1)
When a TTL level V-Lock pulse is input, the camera
synchronizes to the input signal (V-lock
synchronization). The frequency of the input signal
synchronizes to within ±1Hz of the external
synchronization.
Also, 360 degree phase adjustment is possible due to
the phase adjustment of the V-lock signal.
When adjusting V-Phase, first make the phase
adjustment with the Line Lock mode, then switch to
Frequency Lock mode and enable external sync. If not
performing phase adjustment, switch to Frequency
Lock mode then enable external sync. See "Command
List" on page 31.
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Note
Noise may occur when performing phase adjustment with the
Line Lock mode, although it should disappear when switching to
Frequency Lock mode for external sync.
Because V-lock synchronization is a simple synchronization method,
color signals like a VBS "Genlock" signal cannot be synchronized.
1) In V-lock synchronization, the camera makes a V-lock pulse
(VL-PULSE) which synchronizes to the commercial power
supply and uses it as the external synchronization input signal
of the camera, using the fact that the V cycle (59.94 Hz vertical
synchronization signal) and the frequency of the commercial
power supply (60 Hz). The synchronous signal of the camera
will automatically sychronizes to the VL-PULSE in the camera.
Basic Functions
1