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165-072011 THCD-100 Power Supply Page 19 of 28
the data will be taken every 100ms and buffered up, to be sent out every 500ms in blocks of 5
readings. This has proven to be a more robust output method.
c.
Setpoint Value – ‘spv’
This command is used to set the value of the command setpoint. The command takes one parameter
which is the actual value to set.
The current value of the setpoint can be retrieved using the query ‘spv?’. Returned data is:
SP VALUE:
<setpoint value>
d. Setpoint Mode – ‘spm’
This command sets the mode for the command setpoint. The command takes one parameter which
is a number between 0 & 2, identifying the mode, as follows:
0 = AUTO mode
1 = OPEN mode
2 = CLOSED mode
For more information on setpoint modes, see the Principles section 5.4(a).
The current mode of the setpoint can be retrieved by using the query ‘spm?’. The returned data is:
SP MODE: (<x>) <mode string>
… where …
<x> = 0, 1, or 2 and <mode string> =
AUTO, OPEN, or CLOSED respectively.
e.
Setpoint Source – ‘sps’
The setpoint source can be an internally set value or a percentage of the secondary THCD 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 5.4(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 nonvolatile. 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>