Emtech Electronics RCM-42B - Manual (Page 4)

RCM-42 and RCM-82 Installation and Application Notes
©2003, Emtech Electronics, Inc. All rights reserved.
4
Block Diagram
If a given input's Group A (or B) control terminal is connected to ground, that input will be mixed with all other room
inputs with corresponding Group A (or B) terminals connected to ground. The mixed signal will be routed back to each
of the outputs with inputs assigned to that group. A room cannot be assigned to both Group A and Group B
simultaneously; if both the Group A and Group B terminals on a room are connected to ground, the input signal is
routed directly back to the input (in Local mode). Figure 2 shows the internal switching operation of the RCM-42 and
RCM-82.
Figure 2: Block Diagram of the RCM-42B (RCM-82B is identical, but with eight IO pairs)