Fuse Alarm; System Alarm Output Pin - ADC H2TU-C-202 User Manual

Appendix A - Specifications

Fuse Alarm

Pin 25 on the card-edge connector is a Fuse Alarm that is driven to -48 Vdc whenever its onboard fuse opens.

System Alarm Output Pin

Pins 22 and 30 on the card-edge connector, shown in
pins. The following notes apply to pins 22 and 30.
• Pins 22 and 30 replace the Local Loss of Signal (LLOS) on standard repeaters.
• The H2TU-C forces pins 22 and 30 to +5 Vdc (maximum of 10 mA) for a system alarm condition. Pins 22
and 30 then remain at +5 Vdc for the duration of the alarm condition.
•
The H2TU-C Status LED flashes red for the duration of a system alarm condition.
•
Setting the ALM option to DIS only prevents the system alarm bus on pins 22 and 30 from being activated
for a system alarm event. The Status LED still flashes red and the ALRM message still displays.
•
"System Alarms" on page 48
Pins 22 and 30 must never be taken above +5 Vdc or below -60 Vdc.
64
Figure 34 on page
describes the system alarms that activate pins that activate pins 22 and 30.
June 28, 2002
LTPH-UM-1161-01
63, are the H2TU-C System Alarm output
H2TU-C-202 List 3F