https://community.usa.canon.com/t5/Speedlite-Flashes/Canon-ST-E3-RT/m-p/1825#M1102 <P>That terminal on the SRT-E3-RT is for connecting it to a camera's shutter control terminal - in the same way that you would connect any remote release (e.g.&nbsp;RS 80N3) to the camera.&nbsp; Then you trigger the camera from another flash that is talking to the SRT-E3-RT - or so it reads; I have not tired it.</P><P>&nbsp;</P><P>I initially thought the same thing - that I could do what you are saying to integrate the Canon flash into another system, but the SRT-E3-RT user manual says no - it is a shutter release connection terminal.</P><P>&nbsp;</P><P>What might work is connecting brandx receiver to the PC Terminal on a 600EX-RT set as Master that would in turn trigger Slaves 600s.&nbsp; I have not tried that, but might be worth a go...</P> Thu, 15 Nov 2012 03:28:50 GMT stevepow 2012-11-15T03:28:50Z https://community.usa.canon.com/t5/Speedlite-Flashes/Canon-ST-E3-RT/m-p/817#M1101 <P>Does anyone know if the flash/flahes will fire if you plug a third party reciever into the remote release terminal and use the third party transmitter? &nbsp;&nbsp;</P> Tue, 13 Nov 2012 13:19:08 GMT https://community.usa.canon.com/t5/Speedlite-Flashes/Canon-ST-E3-RT/m-p/817#M1101 digital 2012-11-13T13:19:08Z https://community.usa.canon.com/t5/Speedlite-Flashes/Canon-ST-E3-RT/m-p/1825#M1102 <P>That terminal on the SRT-E3-RT is for connecting it to a camera's shutter control terminal - in the same way that you would connect any remote release (e.g.&nbsp;RS 80N3) to the camera.&nbsp; Then you trigger the camera from another flash that is talking to the SRT-E3-RT - or so it reads; I have not tired it.</P><P>&nbsp;</P><P>I initially thought the same thing - that I could do what you are saying to integrate the Canon flash into another system, but the SRT-E3-RT user manual says no - it is a shutter release connection terminal.</P><P>&nbsp;</P><P>What might work is connecting brandx receiver to the PC Terminal on a 600EX-RT set as Master that would in turn trigger Slaves 600s.&nbsp; I have not tried that, but might be worth a go...</P> Thu, 15 Nov 2012 03:28:50 GMT https://community.usa.canon.com/t5/Speedlite-Flashes/Canon-ST-E3-RT/m-p/1825#M1102 stevepow 2012-11-15T03:28:50Z