EATON Power Xpert® Gateway Series 1000 Card User’s Guide S 164201670 Rev 1 49Chapter 5 Modbus RegistersThis chapter describes how to address a specific Power Distribution Unit(PDU) or Remote Power Panel (RPP), a specific panel in a PDU or RPP,and a specific breaker in a panel using Modbus TCP/IP.NOTE To obtain the panel or circuit breaker data, the PDU/RPP must have the EnergyManagement System (EMS) Level 3 option installed.A PDU/RPP distributes power through one or more circuit breakerpanels. Each panel consists of several circuit breakers. Each circuitbreaker monitors more than 30 parameters, such as voltage, current,power, and alarms. The value of each parameter is stored in acorresponding Modbus data register.Because there are many panels in a PDU/RPP, it is necessary to identifya specific breaker and specify the panel containing that breaker. It islikely that Breaker #5 in Panel #1 has different data than Breaker #5 inPanel #7.The tables in this chapter list the names of the PDU/RPP parameters andtheir corresponding Modbus registers for:S PDU/RPP summary dataS Panel summary dataS Breaker dataThe values of the parameters can be read over an Ethernet network byusing Modbus TCP/IP building monitoring programs or Modbus TCP/IPanalyzer programs.NOTE Some Modbus programs provide an option for zero- or one-based addressing. Selectthe option for zero-based addressing. The Modbus numbering scheme for the PDU/RPP startsat 0, so physical coil number 1 corresponds to Modbus register number 0, coil number 2corresponds to Modbus register number 1, and so on.