Fuse Alarm; System Alarm Output Pins; Craft Port - ADC HiGain H2TU-C-231 User Manual

Appendix A - Specifications

Fuse Alarm

Pin 32 on the card-edge connector is a fuse alarm that is driven to -48 Vdc through a diode whenever the onboard
fuse opens.

System Alarm Output Pins

Pins 20 and 21 on the card-edge connector (see
relay contacts. The following notes apply to pins 20 and 21:
•
The H2TU-C-231 Status LED flashes red for the duration of a system alarm condition.
•
Setting the ALM option to DIS only prevents the system alarm relay pins 20 and 21 from closing for a system
alarm event. The Status LED still flashes red and the ALRM message still displays.
C P
RAFT ORT
Figure 32 on page 58
connector on a maintenance terminal.
H2TU-C-231
DB-9 Connector
(DCE)
58
Figure 31 on page
shows the pinout for the craft port connector and its connection to a DB-9 or DB-25
2 TD (Transmit Data)
RD (Receive Data)
3
5 GND
Figure 32. RS-232 Craft Port Pinouts
January 9, 2002
LTPH-UM-1109-01, Issue 1
57) are the H2TU-C-231 System Alarm output
Terminal
DB-9 Connector
(DTE)
2
3
5
Terminal
DB-25 Connector
(DTE)
3
2
7
H2TU-C-231 List 2