26
4.2 Remote Power Failure Alarm and Cable Construction (optional)
The power supply remote monitoring feature in Quartet frames detailed in Table 1.1 informs
the user of a power supply problem. A power failure alarm is provided by the dry contacts
of the rear panel mini-Din 8 connector.
Figure 4.2 describes the pinout of the rear panel mini-Din 8 connector. The mini-Din 8
connector is viewed from the back where the actual wire connections are to be made. The
mini-Din 8 rear panel connector provides a normally closed contact and a normally open
contact. During normal operation, there is a closed contact between pins 1 and 7 and an
open contact between pins 2 and 7. If the power supply fails or experiences a current
overload, contact between pins 1 and 7 opens and contact between pins 2 and 7 closes.
Figure 4.2
Mini-Din 8 connector pinout (alarm condition)
Male Min-Din 8
(viewed from back)
8
7
6
5
4
3
2
1
0
Ground
=Used for RS-422
communication (refer
to section 3.6)