Specifications

Comedi
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Developed from cb_pcidas and skel by Richard Bytheway ([e-mail]).
Only supports DIO, AO and simple AI in it’s present form.
No interrupts, multi channel or FIFO AI, although the card looks like it could support this ←-
.
See http://www.measurementcomputing.com/PDFManuals/pcim-das1602_16.pdf for more details.
5.5.28 cb_pcimdda -- Measurement Computing PCIM-DDA06-16
Author: Calin Culianu <[e-mail]>
Status: works
Manufacturer Device Name
Measurement Computing PCIM-DDA06-16 cb_pcimdda
All features of the PCIM-DDA06-16 board are supported. This board
has 6 16-bit AO channels, and the usual 8255 DIO setup. (24 channels,
configurable in banks of 8 and 4, etc.). This board does not support commands.
The board has a peculiar way of specifying AO gain/range settings -- You have
1 jumper bank on the card, which either makes all 6 AO channels either
5 Volt unipolar, 5V bipolar, 10 Volt unipolar or 10V bipolar.
Since there is absolutely _no_ way to tell in software how this jumper is set
(well, at least according to the rather thin spec. from Measurement Computing
that comes with the board), the driver assumes the jumper is at its factory
default setting of +/-5V.
Also of note is the fact that this board features another jumper, whose
state is also completely invisible to software. It toggles two possible AO
output modes on the board:
- Update Mode: Writing to an AO channel instantaneously updates the actual
signal output by the DAC on the board (this is the factory default).
- Simultaneous XFER Mode: Writing to an AO channel has no effect until
you read from any one of the AO channels. This is useful for loading
all 6 AO values, and then reading from any one of the AO channels on the
device to instantly update all 6 AO values in unison. Useful for some
control apps, I would assume? If your jumper is in this setting, then you
need to issue your comedi_data_write()s to load all the values you want,
then issue one comedi_data_read() on any channel on the AO subdevice
to initiate the simultaneous XFER.
Configuration Options:
[0] PCI bus (optional)
[1] PCI slot (optional)
[2] analog output range jumper setting
0 == +/- 5 V
1 == +/- 10 V