August-2015
Page 6
Panel can produce free 24VDC output which can be used to power even loop output
devices which require external power source or any other equipment. This free output is fused
@ 1A. It is highly recommended to not use this output voltage with different devices when
panel is powered from batteries to save battery current as much as possible especially when
main power will take long time for restore.
3.2.
Input & output circuits
3.2.1.
Loop detectors
HST-HP201-2 contains 2 class A detection loop circuits. Each loop can hold up to 250
addressable loop devices. Loop output devices (Sounders, Modules,…) should not exceed 64
devices per loop and remaining could be input devices (Detectors, Call points,…). Loop
communication protocol is HST protocol.
Loop resistance should not exceed 90Ω for reliable operation. Loops are monitored for
open & short circuit faults and communication errors. Each loop can be enabled or disabled
based on its usage. By default Loop 1 is enabled and Loop 2 is disabled.
Maximum loop current is 400mA. Detection loops cannot produce enough power for loop
devices which require high power (Sounders,…), so external power source should be used
(free 24VDC panel output).
