Title: Hardware Installation Guide.pdf
Do not apply greater than 12 VDC ±15% to any hardware product.To insure reliable operation of all components of the system, it is important that all power supplies used to power the devices are completely isolated from the AC power source.revision 6 — 19Hardware Installation Guidelines1.2Alarm Inputs1.2.1Unsupervised AlarmsUnsupervised alarm inputs sense simple contact closure. Open circuit results in an alarm condition. These inputs are protected by pull-ups, series limiting resistors, and clamp diodes against transients, like ElectroStatic Discharge. The signal is then buffered to reduce the effect of noise.Open contacts should result in terminal voltages of 3.5 to 5 VDC. Closed contact terminal voltage should be between 0 and 0.8 VDC.1.2.2Supervised Alarms