Model ST-ZM2B-SC is a Dual Circuit Zone Controller designed to allow up to 60 conventional detectors (30 on each zone) to be interfaced to Hochiki's ESP analogue addressable system. Full monitoring against malfunction or disconnection, together with a self-test feature through the ESP protocol, ensure the integrity of the CHQ-DZM (SCI) at all times. The ST-ZM2B-SC utilises simple DIL switches for reliable addressing.It is available as an OEM version (as illustrated above) and also as a DIN Rail mountable module (ST-ZM2D-SC ). Both models feature an integral short-circuit isolator. NOTE: When Resistive EOL option is chosen the conventional zone on the ST-ZM2B-SC does not support any line continuity options, therefore if Call Points are being interfaced they should be wired at the beginning of the zone.