GRASS VALLEY JUPITER CM-4400 - VERSION 7.9.0 - 10-2010 - CM-4400 Control System’s Protection Features

JUPITER CM-4400 Control Module Installation and Operating Manual 45
CM-4400 Control System’s Protection Features
CM-4400 Control System’s Protection Features
The CM-4400 has many features that are for your protection. These features
include:
•Alarms
•
Single CM-4400
•Redundant CM-4400
•Redundant Units
Alarm Modes
The CM-4400’s alarm system will start in the following conditions:
• The main CPU (or a main CPU task) is not operating pr
operly.
• The power supply is not operating properly.
• The unit is in the process of rebooting.
The master alarm condition is indicated by e
ither a “00,” “01,” or “FF” on
the front panel’s LED display, and at the rear panel’s Alarm BNC connector
(Figure 3 on page 33). For more information alarm conditions, see Error
Codes on page 260.
The Control Module Alarm Circuit
Electrically, the Alarm BNC operates according to the SMPTE standard
269M-1999. When an alarm is asserted, the circuit associated with the
Alarm connector will present low impedance to an external current source
circuit provided by the customer. Figure9 shows the CM-4400 alarm circuit
(left) and an example of a customer-supplied indicator
circuit (right).
Figure 9. CM-4400 Alarm Circuit
EXTERNAL CIRCUIT
(EXAMPLE)
NOT TO EXCEED
24 VDC @ 20 mA
REAR−PANEL BNC
8 6 05_r1 CM alarm circuit