Enron Modbus Error Codes

Error code (Decimal)	Error code (Hex)	Meaning
0	0x000	No Error
256	0x100	Writing Invalid Data
257	0x101	Illegal Function for the Addressed Slave
258	0x102	Illegal Data Address in the Information Fields for the Addressed Slave
259	0x103	Illegal Data Value in the Information Fields for the Addressed Slave
260	0x104	Failure in Associated Device
261	0x105	Acknowledge - Processing Programming Command
262	0x106	Busy - Reissue Command Later
263	0x107	Negative Acknowledge - cannot perform program function
264	0x108	Memory Parity Error
266	0x10A	Gateway Path Unavailable
267	0x10B	Gateway Target Device Failed to Respond
512	0x200	Illegal Memory Address In Read
513	0x201	Illegal Memory Address In Write
515	0x203	Error Opening Port
516	0x204	Timed Out Waiting For Echoed Message
517	0x205	Timed Out Waiting For Response From Remote
518	0x206	Received Message CRC Error
531	0x213	Communication Channel Not Available
534	0x216	Corrupt or Illegal MODBUS/TCP header
537	0x219	History Table Not Defined in Driver
544	0x220	Error Sending Alarm/Event Log Acknowledge
545	0x221	Incorrectly Sized History Data Returned
546	0x222	Unknown Modbus Exception Code Returned
547	0x223	Multi-Write Not Supported on this Device - See Driver Settings
548	0x224	Read History Index Set but Address Not Defined
549	0x225	History Index From Device Out of Range
550	0x226	Error Reading History Index From Device
551	0x227	Bad Transport Mode
552	0x228	Bad Timestamp with History Log Data
768	0x300	No Error
769	0x301	Port Not Defined
770	0x302	Port Failed To Connect
771	0x303	Port Lost Connection
772	0x304	Serial Port Settings Out of Range
773	0x305	Serial Port Already In Use or Not Available
774	0x306	Serial Port Access Denied
775	0x307	Serial Port General Failure
776	0x308	Serial Port Invalid Parameter
777	0x309	Port Not Connected
784	0x310	Port Unknown Error