When using 'Standalone' mode, the Pronto connects to an ad-hoc network created by the extender(s). The network name depends on the 'Channel' you select on the extenders. The Pronto communicates with extenders on the 'Channel'. Multiple extenders can use the same 'Channel' but must specify a different 'Extender ID' (see switches on the back or in documentation). So, if you have 3 RFX 9400's, set them up on the same 'Channel' (1-3) but on each extender, select a different 'Extender ID' (0-F).

Next, in PEP2/3, specify the 'Channel' as 1, 2, or 3 which matches your extenders and add the RFX9400 Extender 0 - F as needed.

Note that you cannot use RFX9400 for 232 and if you want to use RFX9600 you will not be able to use standalone mode meaning that the Pronto must connect to a Router/AP that you have on a wired network as the RFX9600 only connects to a wired network. When using Wired Network, only the Extender ID matters and not the Channel. See the RFX9400/9600 manuals that are available from this site in the Files Section for more info.