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SeaHawk 10K User Guide
800.518.1519
4
Modbus Communication
4.1.1.3 Data Field
The length of the data field varies depending on the function. The data fields for the
SeaHawk 10K are 16-bit registers, transmitted high order byte first (big-endian).
4.1.1.4 Error Check (Checksum) Field
The checksum field lets the receiving device determine if the packet has transmission errors.
The SeaHawk 10K RTU mode uses a 16-bit cyclic redundancy check (CRC-16).
4.1.1.5 5-1.2 Exception Responses
If a Modbus master sends an invalid command to the SeaHawk 10K or attempts to read an
invalid register, an exception response is generated. The response packet will have the high
order bit of the function code set to one. The data field of the exception response contains the
exception error code.
Code
Name
Description
01
Illegal Function
The function code is not supported
02
Illegal Data Address
Attempt to access an invalid address
03
Illegal Data Value
Attempt to set a variable to an invalid value
Table 4.1
Exception Codes
Summary of Contents for SeaHawk 10K
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Page 6: ...6 SeaHawk10K User Guide 800 518 1519 Configure the SeaHawk 10K for Modbus Communications 43...
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Page 10: ...10 SeaHawk 10K User Guide 800 518 1519...
Page 24: ...24 SeaHawk 10K User Guide 800 518 1519 2 Installation and Configuration...
Page 28: ...28 SeaHawk 10K User Guide 800 518 1519 3 Operation...
Page 38: ...38 SeaHawk 10K User Guide 800 518 1519 5 Preventive Maintenance...
Page 44: ...44 SeaHawk 10K User Guide 800 518 1519 A Configuration Reference...
