Chapter 4 Analog Input Reference
© National Instruments Corporation
4-3
Measure Data Acquisition User Manual
left-to-right is the order that Measure scans the channels. The following
is a table of valid channel strings.
Table 4-1. Examples of Valid Channel Strings
Valid Channel Strings
Channels in the Scan List
9
9
3,1
3,1
4:7
4,5,6,7
9,4:7,3,1
9,4,5,6,7,3,1
0,1 (using one AMUX board)
0,1,2,3,4,5,6,7 on the AMUX board
0 (using two AMUX boards)
0,1,2,3 on the first AMUX board and 0,1,2,3 on the
second AMUX board
ob0!sc1!md1!0:3
0,1,2,3 on the SCXI module in the first slot of the first
chassis
0b0!sc1!md3!0:4,
ob0!sc!md4!7
01,2,3,4 on the SCXI module in the third slot of the first
chassis and 7 on the SCXI module in the fourth slot of
the first chassis
ob0!sc1!md2!20:22,
ob1!sc2!md3!5:8
20,21,22 on the SCXI module in the second slot of the
first chassis and 5,6,7,8 on the SCXI module in the third
slot of the second chassis
For more information about using SCXI, refer to Chapter 3, Using
SCXI with Measure DAQ.
Note:
Some devices, such as the 1200-Series, have a fixed scanning order. If you are
using a device that has a fixed scanning order and you want to scan multiple
channels, you must list the channels in the scan list in descending order with
the last channel in the scan list being channel 0 (for example, 3,2,1,0). If you
are using such a device in differential mode, you must use the even-numbered
channels (for example, 6,4,2,0).
High Limit
Enter the upper voltage limit for the channels in the channel string.
This voltage is the maximum voltage that is measured at any of the
analog input channels that you specify in the channel string. You may
add more than one channel string to your scan list and each channel
string may have a different set of high and low limits. When you create
an AI task, Measure enters the default value for the device.
