Zkteco C3-400 Wiring Diagram. The auxiliary input may be connected to infrared body detectors, fire. +34 916 532 891 distribution: C3400 4Door IPBased Control Panel (C3 Series) Reviews, Photos from zkteco.technology The diagram above takes c3. For how to use the software of the product, see zkaccess4.0 user. +34 916 532 891 distribution: