Spellman High Voltage Electronics Corporation One Commerce Park,
Valhalla, NY 10595, (914) 686-3600, Fax: (914) 686-2870
A logic 1 in any of the five remaining bits indicates a “true” state of that parameter. A logic 0 indicates a
“false”.
EXAMPLE BIT PATTERN
BIT
MEANING:
7
0:
You are looking at the status byte after at least one command
6
1:
You are making your first examination of this byte after the unit’s issuance of an SQR.
5
0:
The previous command was valid.
4
0:
You have not shut down the unit with a “S” command.
3
1:
You did get a trip (a turning off) of high voltage in response to either a voltage or current
overload
2
0:
The supply is not in voltage overload.
1
1:
The supply is in current overload.
0
0:
This bit of this status byte is always logic 0.
3.1.3
DEVIC CLEAR FUNCTION – DCI
The device clear and selective device clear GPIB functions set the high voltage output to 0 volts regardless
of the current voltage program. They perform to 0 volts regardless of the current voltage program. They
perform identically to the user command ‘S’ explained in section 3.2.4.
3.1.4
DEVICE TRIGGER FUNCTION – DTI
The device trigger function is used to update the previously programmed parameters. It performs the same
as the user command ‘G’, explained in section 3.2.3, and has the additional capability of triggering
numerous bus instruments simultaneously.
3.2
USER COMMANDS
The 200-C-488 recognizes a number off commands, in the form of ASCII strings. These commands
execute the various programming and monitoring functions enabling the user to control a Spellman Series
20A/210 high voltage power supply. These commands are:
♦
Programming the Output Voltage (‘P’)
♦
Setting Output Voltage and Current Limits (‘L’)
♦
Shutting off the High Voltage Output (‘S’)
♦
Restoring the High Voltage Output (‘R’)
♦
Selecting the Overload Shutdown Response (‘C’)
♦
Selecting the Overload Service Request Response (‘N’)
♦
Triggering Meter Readings of the Output (‘T’)
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