User`s manual

26 — Controlling VariSpec Filters
Note: it is bad practice to query the awake/sleep status, as a sleeping filter will not
reply.
Version
V <arg> <term>
This can be issued only as a query. It returns the VariSpec firmware revision
number and other configuration data, in the following format:
v_ _ _ rrr_ _bbbb.bb_ _tttt.tt_sssss
where rrr is the firmware revision level; bbbb.bb (no leading spaces or leading
zeroes) is the shortest wavelength the filter can tune to, in nm; tttt.tt is the longest
wavelength the filter can tune to, in nm; and sssss is the serial number.
Note: each underscore represents one space between characters.
Legal <arg> values: Query only
Query reply: revision and configuration data as described above
Wavelength Select
W <arg> <term>
Command: tunes the filter to wavelength <arg>. The legal range of <arg> is deter-
mined by the optics module’s construction and electronics module’s configura-
tion. If <arg> is out of range, it causes an error and lights the Status LED Red.
You can send “>” as the <arg>. This causes the filter to step to a wavelength
longer than the one to which it is presently tuned. The step size is set by the “J”
command. Similarly, if the “<” character is given as <arg>, the filter steps to a
wavelength shorter than the one it is presently tuned to.
Legal <arg> values: [set by optics], “>”, “<”
Query reply: present wavelength in nm
eXecute
X <arg> <term>
Command: issuing this command with <arg> nonzero is equivalent to sending a
trigger pulse to the TTL Sync port, which is available on the electronics controller
box of the XNIR-09-20 model. See “VariSpec XNIR-09-20 TTL Sync Port” on
page 19 for detailes on setting the appropriate control mode. It causes the filter to
jump to the next palette element, or shift the pass wavelength by an amount set by
the Jump command, depending on the mode selected. (See the M command,
“Mode Select” on page 25.)
Legal <arg> values: [0-255]
Query: 0
Temperature of LC elements in optics module
Y <arg> <term>
This can be issued only as a query. It returns the temperature of the liquid crystal
elements of the VariSpec optics module in centigrade.
Legal <arg> values: Query only