Figure 3: Connecting the RC-74DL Master Room Controller
4.1 Connecting the RS-232 Interface
To connect an AV device to the RC-74DL using the RS-232 port, connect the
RS-232 9-pin D-sub port on your AV device to the RS-232 terminal block on the
rear panel of the RC-74DL as shown in Figure 4.
Figure 4: RS-232 Connection