3.4 Block Diagram3.5 Wire Connections1. RS-2322. RS-485CA‐0915GNDRxDTxDCA‐0910NZT‐2570ZT‐2571TxDRxDGNDMCU ZigBeeModuleLED DisplayEEPROM SettingSwitchRS‐232InterfaceRS‐485InterfacePower Circuit+10 ~ 30 VDCD+D -D -D+ICP DAS, ZT‐2550/ZT‐2551 User Manual, Version 1.3 Page 10Copyright @ 2013 by ICP DAS Co., Ltd. All Rights Reserved.