DPS Telecom NetGuardian 216 User Manual page 15

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each alarm point is internally wired to ground, so either a single wire bringing a contact to ground or a dry closure
with the second lead connected to the B side will be sensed as an alarm signal. (See Figure 4.10 for an alarm
connection diagram.) To reverse the alarm point polarity so an open contact triggers an alarm point see section
5.8. (Editor Alarms Tab)
Connect discrete alarms to the 50-pin connector on the back panel, see Figure 4.11. for alarm and analog pinout
information.
Note: Make sure that grounds have a common reference usually accomplished by tying grounds together. See
section 9.5 (Color Code and Pinout for Standard Amphenol Wire) for the typical color coding of pins.
Fig. 4.11 Discretes 1-16 and Analogs 1-4 pinout