8183532002 Rev C8.5.5. ChecksumThe user may add a checksum (optional) to the end of the command. The checksum is“$” followed by two hex characters. If a command or a query has a checksum, theresponse will also have a checksum. There is no CR between the command string andthe “$” sign.Example: STT?3ASTAT?$7B8.5.6. AcknowledgeThe Power Supply acknowledges received commands by returning an “OK” message. Ifan error is detected, the Power Supply will return an error message. The rules ofchecksum apply also to the Acknowledge.8.5.7. Error MessageIf an error is detected in a command or query, the Power Supply will respond with anerror message. Refer to Section 8.6 for details.8.5.8. BackspaceThe backspace character (ASCII 8) clears the last character sent to the Power Supply.8.6. Error MessagesThe Power Supply will return error messages for illegal commands and illegal programmingparameters. Refer to Table 8-1 for programming error messages and Table 8-2 forcommands error messages.Table 8-1: Programming Error MessagesError Code DescriptionE01 Returned when program voltage (PV) is programmed above acceptable range.Example: PV above ‘105% of supply rating’ or PV above “95% of OVP setting.”E02 Returned when programming Output voltage below UVL setting.E04 Returned when OVP is programmed below acceptable range.Example: OVP less than 5% of supply voltage rating’ plus ‘voltage setting’.E06 Returned when UVL is programmed above the programmed Output voltage.E07 Returned when programming the Output to ON during a fault shut down.Table 8-2: Commands Error MessagesError Code DescriptionC01 Illegal command or queryC02 Missing parameterC03 Illegal parameterC04 Checksum errorC05 Setting out of range