Alarm Port Pin Assignments
Page 90 7210 SAS-T Installation Guide
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.
When using the internal isolated 24 VDC power supply on pin 4 of the DB15 Alarm
RTN pins must be connected to chassis ground. The metal shell of the alarm plug may
be used as a chassis ground connection for the internal +24V supply providing that the
plug mounting (hold down) screws are firmly attached to the 7210SAS-T alarm
connector.
Major and Critical alarm dry relay contact outputs are provided on pins 3,10,11 and
1,2,9. These reflect the Major and Critical alarms output by the box and can be
manually cleared by pressing the ACO button.
The 4 alarm inputs are customer configurable to monitor alarms provided by
additional equipment. These inputs require either using the voltage source provided on
pin 4 of the DB15 connector or a separate isolated DC power supply between 18-50
volts at 100 mA. If an external power source is used its outputs must be isolated from
chassis ground, for example do not connect the alarm power supply return to chassis or
rack ground in this scenario. Please reference Figures 1-3 and the 7210SAS-T
software configuration guide.
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 6: Alarm Interface Port Pinouts
Pin Name Function
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