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96 Ch a pte r VI A P B A p p l i c a t i o n ● Pin Assignment Pin assignment: Pin Signal Name Description 1 RS232 interface Used in 232 communication 2 AB Use BA(receiving/sending terminal) when it is connected with APB expansion module 3 GND Ground 4 AB Use AB(receiving/sending terminal) when it is connected with APB main module Note: ote: Please make sure A B connection is correct when RS485 interface is used. ● Mounting Dimensions APB-12M ABAB AB AB APB-12M APB-22E A B HMI 3. Indicators APB-EXPMC has 2 indicators. Consistent ON: indicates it is in power on state; Flashing: indicates DTU stays in normal communication state; APB-M: Indicates APB is communicating with main machine; APB-E: Indicates APB is communicating with expansion module; ABAB AB AB
