SIGMA MRX Series - Manual (Page 9)

6
CONTROL PANEL
To initiate the switching operation, data must be input into the SCI. One way to input this data is
through a control panel. The MRX system is capable of utilizing many different control panels available
from Sigma Electronics, Inc.
The data from the control panels is transferred to the SCI via a communication line. References to
this line are typically abbreviated to COMM line. This coaxial cable is connected between either the COMM
1 or COMM 2 BNC on the SCI interface on the rear of the power frame, and the COMM connection on the
rear of the control panel. Both connectors provide an identical interface to the SCI.
Several control panels may be added to the COMM Line as system requirements dictate. Additional
panels are added by installing BNC “T” connectors in the coax path. Coaxial cable paths for either COMM 1
or COMM2 are recommended to be less than 2000 total feet. This coaxial path should NOT be terminated
in a 75
Ω
load.
Electronics Inc.