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(e)
Setpoint source – ‘sps’
The setpoint source can be an internally set value or a percentage of the secondary CCD
input (known as slave input). This source is set using this command and as with the other
setpoint commands, it takes just one parameter which is as follows:
0 = Internal source
1 = Slave source
(For more information on setpoint sources, see the Principles section - 7.4(b)).
The current source of the setpoint can be retrieved by using the query ‘sps?’. The returned
data is:
SP SOURCE: (
<x>
)
<source id>
…where…
<x> = 0 or 1 as above, <source id> = string identifier for <x> : INTERNAL or SLAVE.
(f)
Setpoint initial value – ‘siv’
The setpoint value set with the ‘spv’ command (above) is not non-volatile. This command
can be used to set an initial setpoint value on system startup. It takes one parameter which
is the initial setpoint value.
The current value of the setpoint can be retrieved using the query ‘siv?’. Returned data is:
SP INIT VAL:
<initial setpoint value>
(g)
Setpoint initial mode – ‘sim’
As with the value, the setpoint mode set using the ‘spm’ command (above) is a volatile
setting. Again this command provides a way of setting an initial startup mode for the
setpoint on power up of the CCD. It takes one parameter which is a number between 0 &
2, identifying the initial mode, as follows:
0 = Auto mode
1 = Open mode
2 = Closed mode
The current mode of the setpoint can be retrieved by using the query ‘spm?’. The returned
data is:
SP INIT MODE: (
<x>
)
<mode string>
… where …
<x> =
0
,
1
, or
2
and <mode string> =
AUTO
,
OPEN
, or
CLOSED
respectively.
