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Appendix C—Optional Communication Cards
Power Xpert C445 Global Motor Management Relay
MN042003EN—January 2019
www.eaton.com
291
Modbus TCP Protocol
The C445 Ethernet Card supports the Modbus TCP protocol
as a server device.
The supported function codes are shown below. The
Modbus register map for the C445 is identical for the
Modbus TCP and the Modbus serial protocols and may be
found in
Appendix D
of this user manual.
Table 117. Modbus TCP Function Codes
Function Code
Name
Standard Function Codes
0x01
Read Coils
0x02
Read Discrete Inputs
0x03
Read Holding registers
0x04
Read input registers
0x05
Write single coil
0x06
Preset Single register
0x07
Read exception status
0x08
Diagnostics
0x0F
Write Multiple Coils
0x10
Write Multiple Registers
0x17
Read/Write Multiple Registers
0x2B/0x0E
Read device identification
Vendor Specific Function Codes
0x42
Device Services
0x43
Read Attribute
0x44
Write Attribute
0x45
Read/Write attribute