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.
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