I'm going to guess yes although I haven't tried it, because the RNET protocol should be identical whatever device is spitting it out be it an ST2 or an ACA-E5. I believe the devices duplicate/forward all serial communications out all serial ports(RS232, RNET, Keypads, Etc) which is why you get the tuner metadata out of the CAV/CAM/Sphere's RS232 ports to begin with. I can confirm in a 1 way scenario you can send a 1 way command to any RNET device and it will get repeated until it reaches the device the string is intended for.