LI-COR LI-6400, Manual

Page: 825 / 846

Customizing Open
Using Spare Channels
Using the LI-6400 26-23
For a general discussion of analog input programming, see Analog Measure-
ments on page 23-66.
Analog Output Channels
Six digital to analog output channels are available for use (Table 26-10).
Connections
Use pin 13 as the ground for these outputs.
Software
An analog output is controlled with the LPL command AOSET. (This and re-
lated commands are discussed in
Analog Output Control (D/A) on page
23-73.) There are a number of ways to update an analog output signal, and a
few examples are listed below. Which method you use depends on how often
you wish to have the signal updated.
¥
Once at the start of OPEN
This is probably most easily done by inserting a PATCH= command into the
configuration file. This will execute every time that configuration is imple-
mented. For example, suppose you need to provide 4 volts to some device as
part of a particular configuration. If you are using channel 10 for this, you
would add
PATCH= 4000 10 AOSET
to your configuration file. That will set analog output channel 10 to 4000 mV.
¥ Only when the user presses a function key and enters a new value
This technique involves defining function keys in New Measurements mode.
An example of doing this can be seen by installing the
"LI-610 Fct Key
Table 26-10. Spare D/A channels.
LPL
ID#
Pin #
(37 Pin Connector)
Range
(V)
Resolution
(mV)
Current
(mA)
3 12 -5 to +5 2.44 ±5
9 27
0 to 5 19.5
+5 / -2
10 9
17 29
-5 to +5 39 18 11
19 30