Programming instructions

Chapter 5 Things You Should Know about Analog Input
© National Instruments Corporation 5-13 LabVIEW Data Acquisition Basics Manual
Channel Addressing with the AMUX-64T
An AMUX-64T external multiplexer device expands the number of
analog input signals a plug-in DAQ device can measure. You can address
AMUX-64T channels when you attach one, two, or four AMUX-64T
devices to a plug-in DAQ device. With this device, you can multiplex four,
eight, or 16 AMUX-64T channels into one device channel. The scanning
order of these AMUX-64T channels is fixed. To specify a range of
AMUX-64T channels, enter the device channel into which the range is
multiplexed in the
channel list
. For example, if you have no AMUX-64T
devices, a
channel list
element of
0
specifies device channel
0
. If you have
a AMUX-64T device, a
channel list
element of
0
specifies channels
0
through
3
on each AMUX-64T device. Table 5-2 shows the number of
channels available on a DAQ device with an external multiplexer.
You specify the number of AMUX devices through the configuration utility
or the AI Hardware Config VI. Refer to the
LabVIEW Function and VI
Reference Manual
or the LabVIEW
Online Reference
, available by
selecting
Help»Online Reference…
, for more information on this VI.
Table 5-2.
Analog Input Channel Range
Number of
AMUX-64Ts
Channel Range
(Single-Ended)
Channel Range
(Differential)
0 0 through 15 0 through 7
1
AM1!0
through
AM1!63 AM1!0
through
AM1!31
2
AM1!0
through
AM1!63
,
AM2!0
through
AM2!63
AM1!0
through
AM1!31
,
AM2!0
through
AM2!31
4
AM1!0
through
AM1!63
,
AM2!0
through
AM2!63
,
AM3!0
through
AM3!63
,
AM4!0
through
AM4!63
AM1!0
through
AM1!31
,
AM2!0
through
AM2!31
,
AM3!0
through
AM3!31
,
AM4!0
through
AM4!31