
Thank you for purchasing YongNuo products in advance.
Please read this user manual carefully and learn how to use camera and
flash before.
This product is a wireless transceiver integrated design, for the convenience
of description,the product will named “transmitter” when mounted on the
camera hot shoe in some cases, while named “receiver” when mounted or
connected to the flash.
Contents
General description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Cautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
The name of each part for RF-603 II . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Preparation before using . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-7
Wireless flash trigger awaken & testing . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Wired/wireless remote shutter release . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Function extend . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-11
Troubleshooting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Include items/Optional Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

General description
RF-603 II adopts a global free FSK 2.4GHz wireless channel which can be suitable
in many countries. RF-603 II with FSK system, can be more effective to guarantee
speed, distance and stability. Within capacious areas, the remote control distance
may reach to 100m, and suitable for RF-603I.
RF-603 II wireless flash trigger kit is formed by two same transceivers. It can be
set to single transmit state (TX), which will be more convenient for testing flash, and
can be set to transceiver state (TRX), automatically switch transmit and receive state,
adopts
focus and shutter function in “TX” and “TRX” state respectively.
Transmitter supports single contact triggering, supports wireless wakening
up and triggering the flash through the camera hot shoe, with PC sync cable
(optional) can be trigger studio lights, with specially camera shutter connecting cable
can realize wired / wireless shutter release remote control, supports controlling
multiple cameras and flashes at the same time.
The highest flash sync speed up to 1/320 second (some of models may only reach
to 1/250s or less, difference combination of models of flash and camera using may
achieved difference flash sync speed).
2 levers button design , it will realize the awakening, flash testing,
1

Cautions
1. As this is an electronic product accessory, some of the environment causes
may affect the working. However this is hardly ever to get this situation,
don't worry.
2. Do not pull the wires and turn off the camera when connecting.
3. For a long time non-use, please turn the transceiver off and remove the
batteries.
4. Do not put it in high temperature, such as a closed car under direct sunlight,
the control panel and other high temperature areas.
5. Keep dry, do not use wet hands contact with the product, the product must
not be immersed in water or exposed to rain, and this may and this may lead
to not work properly.
6. Do not used in the flammable occasion in violation of this warning may cause
an explosion or fire.
7. Owing to this product include battery, please operate it strictly according to
related rules, otherwise maybe cause explosion, fire or physical injury.
8. Do not trigger the flash close to a person's eyes, it may impair the person's
vision.
2

2.The LS-2.5 series shutter
connecting cable
1.The LS-PC series flash cable
C1
Canon60D/350D/450D/
500D/550D/600D/650D
/700D Pentax Series
C3
Canon
1D/5D/7D/10D/20D/
30D/40D/50D
N1
Nikon
D1/D2/D3/D4 Series
D200/D300
D700/D800
N2
Nikon
D70/D70S/D80
N3
Nikon
D90/D600
D3000/D5000 Series
D7000 Series
Include items/Optional Accessories
3
Include items:
RF-603C II or RF-603N II . X2
LS- 2. 5 Shutter Cable* . . X1
User Manual . . . . . . . X1
*Shutter Cable shown according to the packaging.
Optional Accessories:
LS-PC635 LS-PC/PC
You can additionally purchase the shutter
cable or PC sync cable if needed.
LS-2.5/C1...

The name of each parts of RF-603 II
The RF-603C II is
more suitable for
Canon cameras.
The RF-603N II is
more suitable for
Nikon cameras.
4
A: Focusing indicator light (green) /
Shutter indicator light (red)
B: 2.5mm shutter remote cable socket
C: Hot shoe / Hot shoe contacts
D: PC socket(output)
E: Awakening indicator light (green) /
Flash trigger indicator light (red)
F: Multifunction button
G: Power switch- 1.TX
2.TRX(transmit-receive )
H: Locking ring
I: Hot shoe mounting foot
J: Contacts
K: Channel setting switch
L: Battery room
M:Battery door
(transmit)

Preparation before using
1.Channel Setting:
Use the channel setting switch to set the transceivers
to the same code, total 16 channels.
2.Battery Installation:
Slide to open the battery room, install two AAA
batteries(not include) for two transceiver according to
the "+/-" marks shown.
3.Fix the transceiver on the camera hot shoe:
Mount the transceiver on the hot shoe of the camera by
hot shoe mounting foot, then tight the locking screw.
Support installing the flash on the transceiver (The
On-Top Flash,as the picture shown).
5

Preparation before using
4.Fix the transceiver on light stand or flash bracket :
Mount the transceiver on the mini stand of the flash
attached or other fixed device (not included), and tight the
locking screw.
5.Fix the flash on transceiver:
Install the flash on the hot shoe of the transceiver, lock the
flash and ensure all links are fixed well.
6.Use the PC port to connect other type of flashes :
To realize the function you need to additionally purchase
the LS-PC series cable according to the different interface.
1.Inset the PC cable with the end of nutsert to PC socket of
the transceiver, and tight the nutsert.
2.Inset another end of the cable to the synchronous socket
of the the flash.
The PC port just used as output to connect the flash.
6

Preparation before using
7.Power Switch a n d Tr a n s m i t - r e c e i v e Sta t e
Settings:
Set the power switch on TX (single transmit) or TRX
(transmit-receive automatic switch) state according to
different shooting requirement. When it used as wireless
triggering transmitter and flash testing, set to "TX"; while
used as wireless triggering receiver, using shutter release or
other extended functions, set to "TRX", as the table shown,
set to OFF means turn off the power.
7
FMake sure all the transceivers have been fixed before using , the flash
need to set to manual “M” mode.