Lake Shore Model 642 Electromagnet Power Supply User’s Manual
Computer Interface Operation
5-9
5.1.4.2.2
Operation Event Register Set
The Operation Event Register reports the following instrument events: ramp done, compliance. Any or all of these events
may be reported in the operation event summary bit through the enable register, see Figure 5-3. The Operation Event
Enable command (OPSTE) programs the enable register and the query command (OPSTE?) reads it. OPSTR? reads the
Operation Event Register. OPST? reads and clears the Operation Condition register. The used bits of the Operation
Event Register are described as follows:
Power Limit, Bit (2)
– This bit is set if the output is in power limit.
Ramp Done, Bit (1)
– This bit is set when the output current ramp is completed.
Compliance, Bit (0)
– This bit is set if the output is in compliance limit.
To Bit 7 (OSB) of
Status Byte Register
(See Figure 5-1.)
OR
AND
Used
Not
Not
Not
Not
Not
OPSTE,
Used
OPSTE?
Used
Used
Used
Event Enable
Operation
Register
7
5
6
4
Name
AND
2
3
0
1
AND
Bit
Used
Not
Not
Used
Not
Used
Register
OPSTR?
Operation
Event
7
Not
Not
Not
Used
Used
Used
5
6
4
Not
Used
7
Condition
OPST?
Register
Operation
4
6
5
Used
Not
Used
Not
Used
Not
3
2
1
0
Name
Bit
0
1
2
3
Bit
Name
Figure 5-3. Operation Event Register
