Lake Shore Model 647 Magnet Power Supply User’s Manual
Remote Operation
4-18
4.3.1.6 Common Commands Description
The MPS Common Commands below are input/output commands defined by the IEEE-488 standard and
shared with other instruments complying with the standard. Common commands begin with “
*
”.
*
CLS:
Clear Status Register Command
Input:
*
CLS
Returned:
Nothing.
Remarks:
Clears the Status Register, but
not
the instrument. It clears the bits in the Status Byte Register
and the Standard Event Status Register and terminates all pending operations. The
instrument-related command is
*
RST
.
*
ESE:
Enables Status Reports In The Standard Event Status Enable Register
Input:
*
ESE [bit weighting]
where
[bit weighting]
= the sum of the bit weighting of each bit to be
set. The value can be 000 to 255. See the discussion on registers and below.
Remarks:
Each bit is assigned a bit weighting. See the format of the Standard Event Status Register
(given below) to see bit weighting and register placement. Further explanation of each bit is
discussed in the register section following the Common Command Table. See Paragraph
4.1.3.2 for a complete description of status bits.
7 6 5 4 3 2 1 0
Bit
128
64 32 16 8 4 2 1
Weighting
PON
not used
CME EXE DDE QYE
not used
OPC
Bit Name
Example:
To set a bit, send the command *ESE with the sum of the bit weighting for each bit
desired. For example, to set bits 0, 3, 4, and 5, send the command *ESE57. 57 is the sum of
the bit weighting for each bit:
Bit
Weighting
0
1
3
8
4
16
5
32
57
*
ESE?:
Standard Event Status Enable Query
Input:
*
ESE?
Returned:
An integer between
000
and
255
.
Remarks:
Reads the Standard Event Status Enable Register. The integer returned represents the bits
set in the Standard Event Status Enable Register. It is a sum of the bit weighting of each bit
set. Returns three digits plus up to two terminators.
*
ESR?:
Standard Event Status Register Query
Input:
*
ESE?
Returned:
An integer between
000
and
255
.
Remarks:
Reads the Standard Event Status Register. The integer returned represents bits set in the
Service Request Enable Register. It is a sum of the bit weighting of each bit set. This Query
supplies various error conditions and whether the MPS has been powered off and on since the
last query. Returns three digits plus up to two terminators.
