Appendix C—Optional Communication Cards224 Power Xpert C445 Global Motor Management Relay MN042003EN—October 2016 www.eaton.comModbus TCP ProtocolThe C445 Ethernet Card supports the Modbus TCP protocolas a server device.The supported function codes are shown below. TheModbus register map for the C445 is identical for theModbus TCP and the Modbus serial protocols and may befound in Appendix D of this user manual.Table 116. Modbus TCP Function CodesFunction Code NameStandard Function Codes0x01 Read Coils0x02 Read Discrete Inputs0x03 Read Holding registers0x04 Read input registers0x05 Write single coil0x06 Preset Single register0x07 Read exception status0x08 Diagnostics0x0F Write Multiple Coils0x10 Write Multiple Registers0x17 Read/Write Multiple Registers0x2B/0x0E Read device identificationVendor Specific Function Codes0x42 Device Services0x43 Read Attribute0x44 Write Attribute0x45 Read/Write attribute
