83-517-000 Rev. A
Checksum 7.5.5
The user may optionally add a checksum to the end of the command. The checksum is “$” followed by two hex
characters. If a command or a query has a checksum, the response will also have one. There is no CR between
the command string and the “$” sign.
Example: STT?$3A
STAT?$7B
Acknowledge 7.5.6
The power supply acknowledges received commands by returning an “OK” message. If an error is detected the
power supply will return an error message. The rules of checksum also apply to the Acknowledge.
Error Message 7.5.7
If an error is detected in command or query, the power supply will respond with an error message. Refer to
Section 7.6 for details.
Backspace 7.5.8
The backspace character (ASCII 8) clears the last character sent to the power supply.
7.6 ERROR MESSAGES
The power supply will return error messages for illegal commands and illegal programming parameters. Refer to
Table 7-1 for programming error messages and Table 7-2 for command error messages.
Returned when program voltage (PV) is programmed above acceptable range.
Example: PV above ‘105% of supply rating’ or PV above 95% of OVP setting’.
Returned when programming output voltage below UVL setting.
Returned when OVP is programmed below acceptable range.
Example: OVP less than “5% of supply voltage rating’ plus ‘voltage setting’.
Returned when UVL is programmed above the programmed Output voltage.
Returned when programming the Output to ON during a fault shut down.
Table 7-1: Programming Error Messages
Table 7-2: Command Error Messages
7.7 COMMAND SET DESCRIPTION
General Guide 7.7.1
1. Any command or argument may be in capital letters or small letters.
2. In commands with an argument, a space must be between the command and the argument.
3. For any command that sets a numeric value, the value may be up to 12 characters long.
4. Carriage Return: If the CR character (ASCII 13) is received by itself, the power supply will respond with “OK”
and CR.
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