The Other YN-622C User Guide v.4.09
11/12/2014 Page 8 of 64
TERMS AND DEFINITIONS
The Devices
622C: An abbreviation for a YN-622C transceiver.
C-TX: An abbreviation for a YN-622C-TX controller. It does not refer to the YN560-TX
Hot-shoe, Hot-foot, Cold-shoe: The hot-shoe is the accessory fitting on top of camera and each
transceiver. The hot-foot has contacts and goes into a hot-shoe, e.g. bottom of a flash or
transceiver. A cold-shoe holds a hot-foot without making contact with the pins.
Wireless: This term logically includes radio, sound and light transmission communication links.
Canon uses “Wireless” for their light-pulse code communications from camera/Master flash to an
off-camera slave flash. The 622C cannot send or read light-pulse codes, using radio instead.
Roles
Transmitter (TX): A YN-622C transceiver (first released in August 2012) mounted on the camera’s
hot-shoe in the role of controller for remote units. (The transmitter will still act as a Remote to
another transceiver transmitting on the same channel.)
Remote Receiver (RX): A YN-622C transceiver (first released in August 2012) in the role of a
receiver with a remote flash connected by hot-shoe or PC-sync cable.
Controller (C-TX): A YN-622C-TX controller (released in June 2014) mounted on the camera’s
hot-shoe provides full settings capability in place of the camera menus.
On-TX flash: A hot-shoe flash mounted on the Transmitter. It has some special features.
(The C-TX Controller does not have a hot-shoe to mount a flash.)
Modes and Scope
Remote Mode (622C only): Remote control of flashes from the camera.
Mix Mode (622C only): Mixed remote and local (on-flash) control of flashes.
Global: Applying to all groups (A plus B plus C).
Local: Applying to the local device, such as a setting by hand on a flash.
Synchronising Flash with Shutter
Sync: Synchronous firing of flash when the camera’s shutter gives the command.
X-Sync: A camera’s fastest shutter speed when both curtains are fully open to a flash.
High Speed Sync (HSS): A method of extending flash emission to provide light during shutter
speeds faster than x-sync. It involves starting the emission before the curtains are fully open.
Super Sync (SS): YongNuo’s technique for using studio flashes/heads at a shutter speed faster
than the camera’s x-sync.
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