Appendix A - Specifications

LTPH-UM-1109-01, Issue 1

 

 

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 Figure 31 on page 57) are the H2TU-C-231 System Alarm output 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.

CRAFT PORT

Figure 32 on page 58 shows the pinout for the craft port connector and its connection to a DB-9 or DB-25 connector on a maintenance terminal.

Terminal

 

 

 

 

 

 

 

 

 

DB-9 Connector

 

 

 

 

 

 

 

 

 

 

(DTE)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2

 

 

 

 

 

 

 

 

 

 

 

 

H2TU-C-231

 

 

 

 

 

 

 

3

 

 

 

 

 

 

 

 

 

 

 

 

DB-9 Connector

 

 

 

 

 

 

 

5

 

(DCE)

 

 

 

 

 

 

 

 

 

 

 

 

 

TD (Transmit Data)

 

 

 

 

 

2

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

3

 

 

RD (Receive Data)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Terminal

 

5

 

 

 

GND

 

 

 

 

 

 

 

 

 

 

DB-25 Connector

 

 

 

 

 

 

 

 

 

 

(DTE)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

3

2

7

Figure 32. RS-232 Craft Port Pinouts

58

January 9, 2002

H2TU-C-231 List 2