Lake Shore Model 647 Magnet Power Supply User’s Manual
Remote Operation
4-20
*
SRE:
Enables Status Reports In The Service Request Enable Register
Input:
*
SRE [bit weighting]
where
[bit weighting]
= the sum (000 to 255) of bit weighting of each
bit to be set. See the discussion on registers and below.
Remarks:
Each bit is assigned a bit weighting. See the format of the Status Byte Register (given below)
to see weighting and register placement of bits. See the register section following the
Common Command Table. See Paragraph 4.1.3.1 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
SDR SRQ ESB OVP ERR RSC LIM ODR
Bit Name
Example:
If a bit in the Service Request Enable Register is set (1), its function is enabled
and reported in the Status Byte Register. For example, to enable bits 1, 2, 4 and 6, send the
command
*
SRE86
. 86 is the sum of the bit weighting for each bit:
Bit Weighting
1
2
2
4
4
16
6
64
86
*
SRE?:
Service Request Enable Query
Input:
*
SRE?
Returned:
An integer from
000-255
.
Remarks:
Reads the Service Request Enable Register. The integer returned represents the sum of
the bit weighting of each bit set. Returns three digits plus up to two terminators.
*
STB?:
Status Byte Query
Input:
*
STB?
Returned:
An integer from
000-255
.
Remarks:
Reads the Status Byte Register. The integer returned represents the sum of the bit
weighting of each bit set. Although this query acts like a serial poll, it does not reset the
register to all zeros. Returns three digits plus up to two terminators.
*
TST?:
Self Test Query
Input:
*
TST?
Returned:
0
= No errors
3
= Reserved
6
= AC High
9
= OI Active
1
= Remote Inhibit Active
4
= STP Error
7
= Rail High
2
= OVP Active
5
= AC Low
8
= Overtemperature Error
Remarks:
Causes instrument to report any failures. Returns 1 character plus up to 2 terminators.
*
WAI:
Wait-to-Continue Command
Input:
*
WAI
Returned:
Nothing.
Remarks:
The command prevents the instrument from executing any further commands or queries
until all previous ones have been serviced. This command is accepted but not supported
(not the IEEE-488.2 defined operation). Not supported by the Control Bus.