Modbus™ CommunicationBESTCOMSPlus® Navigation Path: Settings Explorer, Communications, Modbus SetupHMI Navigation Path: Not available through HMI.DECS-250 systems support the RS-485 mode and Modbus/TCP (Ethernet) mode at the same time.DECS-250 Modbus communication registers are listed and defined in the Modbus Communication sectionof this manual.Modbus settings for RS-485 and Ethernet are illustrated in Figure 135 and consist of RS-485 Unit IDA,RS-485 Response DelayB, and Ethernet Unit IDC.Figure 135. Modbus SetupA RS-485 Unit ID: Adjustable from 1 to 247 in increments of 1.B RS-485 Response Delay: Adjustable from 10 to 10,000 milliseconds in 10 millisecond increments.CEthernet Unit ID: Adjustable from 1 to 247 in increments of 1.RS-485 PortBESTCOMSPlus®Navigation Path: Settings Explorer, Communications, RS-485 SetupHMI Navigation Path: Settings, Communications, RS-485 SetupAn RS-485 port uses the Modbus RTU (remote terminal unit) protocol for polled communication with othernetworked devices or remote annunciation and control with an IDP-800 Interactive Display Panel. RS-485port terminals are located on the left side panel and are identified as RS-485 A, B, and C. Terminal Aserves as the send/receive A terminal, terminal B serves as the send/receive B terminal, and terminal Cserves as the signal ground terminal. Figure 136 illustrates typical RS-485 connections for multipleDECS-250 controllers communicating over a Modbus network.CALL US TODAY1-888-POWER-58REQUEST A QUOTEparts@genpowerusa.comSHOP ONLINEwww.genpowerusa.comCALL US TODAY1-888-POWER-58REQUEST A QUOTEparts@genpowerusa.comSHOP ONLINEwww.genpowerusa.com