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7.5 Communication Interface Protocol
NOTE
The address (
“ADR n”) command must return an “OK” response before any other
commands are accepted by a power supply.
7.5.1 Data Format
Serial data format is 8 bit, one start bit and one stop bit. No parity bit.
7.5.2 Addressing
The Address is sent separately from the command. It is recommended to add 100msec
delay between query or sent command to next unit addressing.
7.5.3 End of Message
The end of message is the Carriage Return character (ASCII 13). The power supply
ignores the Line Feed (ASCII 10) character.
7.5.4 Command Repeat
The backslash character “\” will cause the last command to be repeated.
7.5.5 Checksum
The user may add a checksum (optional) to the end of the command. The checksum is
“$” followed by two hex characters. If a command or a query has a checksum, the
response will also have one. There is no CR betwe
en the command string and the “$”
sign.
Example: STT?$3A
STAT?$7B
7.5.6 Acknowledge
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.
7.5.7 Error message
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.
7.5.8 Backspace
The backspace character (ASCII 8) clears the last character sent to the power supply.
