UPS System: HIPULSE E
Communication System Manual
Description of Protocol
(Modbus/Jbus Interface)
Page 5-20
(04/07)
5.14
ERROR RESPONSE MESSAGE FORMAT
Message
Meaning
Size (Bytes)
Values
Format
SLAVE
Panel board address
1
0x01 - 0xF7
HEX
FCT
Function Code
1
FCT or 0x80
HEX
ERR
Error Code
1
Note 1
HEX
CRC
Checksum
2
HEX
Note 1:
Error Code 01 =
unknown function code
Error Code 02 =
address error
Error Code 03 =
data error
Error Code 04 =
bus error/busy
Error code 1 signifies that the requested function is not supported.
Error code 2 specified above is sent in response to a request for inexistent parameters with an address out of range
(address error). By definition MODBUS will not permit “holes” in parameter addresses. In response to a request for
inexistent parameters or parameters with an address which falls between existing parameter addresses the value
0xFFFFH will be sent.
Error code 3 signifies that there were errors in the request and that it cannot be performed.
Error code 4 may signify the following statuses:
•
CAN bus busy
•
Unit BLOCKED because operator is accessing Operator Panel
•
CAN bus error/no response.