We are in the strange position that we have to use two
different control systems with two processors in one system.
The reason for this is that our client who already owns
an RTI T3/RP6, has moved to a new house and needs 3 more
remotes. One would be a waterproof RTI (U1 or U2 - when
available) but the other two would be a Pronto TSU9600
and TSU9400 (with RFX9600). The reason for going with
the Prontos is that the client has seen them and likes
them a lot but also because we have a Denon AVR2308 in
the living room (the pronto can control the AVR 2way with
volume, surround mode and tuner station feedback) but
also because there would be an Escient FP1 connected to
our matrix switch. The pronto offers very nice 2 way control
of the Escient ipod dock.

Up to here there is no problem as we will be controlling
everything (dvd playes, satellite receivers e.t.c) using
IR so we would just stick 2 emitters

(one from each control system) on each machine. Some components
will be controlled by IP and RS232 but these ones do not
need control by both system.

The problem is the AMX matrix switcher that can only be
controlled by RS232 and has to be able to be controlled
by both systems. We need to split this RS232 so that we
would be able to connect both the RFX9600 and the RP6
to it. Can anybody reccommend a suitable device to split
the RS232 signal? Please note that the directions of the
signal would be opposite: it has to be 2 ports in and
1 out.

I understand that there is the possibility of sending
2 strings at the same time from each system and the matrix
will get confused but this is not a really big problem
in this house as the customer is a bachelor and by probability
this would happen very very rarely.

I also do not like the option of the RFX9600 controlling
the RP6 using IR triggers so that only one RS232 port
would be required on the matrix. It makes the system more
complicated and more easy to fail. So to sum it up we
need a device that accepts 2 RS232 ports and outputs to
1.

Thanks for any help and suggestions in advance.