Simon,

To my knowledge, the mini jacks on the RFX9400 only support IR. If you need to do 232 control, you will need an RFX9600. And there are not 4 distinct UART chips in the 9600. Search for a thread by me regarding a shared UART (keyword UART) on ports 3 and 4. What this means to you is that you can only reliably send and receive on ports 1 and 2. Ports 3 and 4 share the same UART and therefore you are only guarantee that you can send on both. If you try to receive on port 3, for example, the response received may be data coming from equipment attached to port 4.

The RFX9400 box clearly states contents as 2 dual IR emitters and 2 mini-jack IR cables. Page 3 of the starter guide for the RFX9400 states the jacks as being 4 IR outputs.

So, I am a bit confused.
Can you please point me to documentation that you are referencing?

Thanks,
Lyndel