7210 SAS-T Overview
7210 SAS-T Installation Guide Page 15
RTN refers to the negative side of the alarm In connections floating power supply. If an external
power supply is used to source the voltage for Alarm-In 1-4 its negative rail must not be connected
to chassis ground and it should be 18-50 volts DC at 100 mA.
Please refer to Appendix , “Appendix C: Alarm Pin Assignments,” on page 87 for further
information.
5 ALARM_IN4_EXT_+ External alarm input 4 (external relay dry
contact closure to pin 12).
6 ALARM_IN3_EXT_+ External alarm input 3 (external relay dry
contact closure to pin 13).
7 ALARM_IN2_EXT_+ External alarm input 2 (external relay dry
contact closure to pin 14).
8 ALARM_IN1_EXT_+ External alarm input 1 (external relay dry
contact closure to pin 15).
9 CRIT_ALARM_NC Normally closed contact will be disconnected
from the common contact during a Critical
alarm state.
10 MJR_ALARM_COM Common contact for Major alarm relay.
11 MJR_ALARM_NO Normally open contact will be connected to
the common contact during a Major alarm
state.
12 ALARM_IN4_EXT_RTN External alarm input 4 (external relay dry
contact closure from pin 5).
13 ALARM_IN3_EXT_RTN External alarm input 3 (external relay dry
contact closure from pin 6).
14 ALARM_IN2_EXT_RTN External alarm input 2 (external relay dry
contact closure from pin 7).
15 ALARM_IN1_EXT_RTN External alarm input 1 (external relay dry
contact closure from pin 8).
Table 4: Alarm Interface Port Pinouts
Pin Name Function
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