The Other YN-622C User Guide v.4.0911/12/2014 Part II – 622C Transceivers Page 33 of 64Group IndicatorsThere are two independent Group types:Receiver GroupTest Firing Group• Each current Group setting is remembered at power-down.• An on-TX flash has no group indication. It is deemed to be in Group A, and uses Group A’ssettings.Receiver GroupEach 622C can belong to only one selected Receiver Group: A (default), B or C.• Set while in standby mode.• The Receiver Group is displayed briefly at start-up, and when [GP] is pressed.• While receiving, the Receiver Group LED will wink.GP LED Receiver Group NotesA AAAB BBBC CCCTest Firing GroupWhen [TEST] is pressed, flashes are awakened; and when released a test flash is fired.• Select Test Firing group by holding [TEST] and pressing [GP] repeatedly.• The default test group is ABC.• Testing includes connection through the PC-sync port.• An on-TX flash will be included in the transmitter 622C’s Receiver group, which may beReceiver Group A, B or C.GP LED Test GroupsA AAA AAABBB AAACCC AAABBBCCCB BBB AAABBB BBBCCC AAABBBCCCC CCC AAACCC BBBCCC AAABBBCCCCamera Firing GroupWhen a 622C Transmitter is activated by pressing half-shutter or opening an External flash menu,the GP LEDs indicate the camera’s Firing Group setting as shown in the Menu.• The Firing group is set using the camera’s External Flash/Wireless menu settings.• Canon does not provide for just A or B or C.• Groups A and B are always enabled.GP LED Firing Groups Notes(None) Wireless Off All, no GroupsA AAA+++BBB+++CCC All, Single GroupB AAA:::BBB Two GroupsC AAA:::BBB CCC Three Groups