Programming instructions

Chapter 11 AMUX-64T External Multiplexer Accessory

DAQ Hardware Overview Guide 11-4 www.ni.com

For example, if you use one AMUX-64T accessory, whenever NI-DAQ

selects channel 0 on the MIO or AI device in the scan sequence, channels

0 through 3 on the AMUX-64T are automatically scanned. If you use

two AMUX-64T accessories, channels 0 through 3 (accessory A) and

channels 64 through 67 (accessory B) are automatically scanned whenever

channel 0 is selected in the scan sequence. If you use four AMUX-64T

accessories, channels 0 through 3 (accessory A), channels 64 through 67

(accessory B), channels 128 through 131 (accessory C), and channels 192

through 195 (accessory D) are automatically scanned whenever channel 0

is selected in the scan sequence.

If you program the MIO or AI device with a sequential channel scan

sequence of 0 through 7 or 0 through 15, the AMUX-64T channels are

scanned from top to bottom in the order given in Table 10-3. Notice that if

you use differential input configuration, you should enter only MIO or AI

device channels 0 through 7 in the scan sequence in the NI-DAQ function

SCAN_Setup or the LabVIEW AI_Config.vi or

AI_Group_Config.vi, in which case only the information pertaining to

those channels in Table 11-3 applies. See the AMUX-64T User Manual for

more information on the external multiplexer device.

9 36–39 36–39 100–103 36–39 100–103 164–167 228–231

10 40–43 40–43 104–107 40–43 104–107 168–171 232–235

11 44–47 44–47 108–111 44–47 108–111 172–175 236–239

12 48–51 48–51 112–115 48–51 112–115 176–179 240–243

13 52–55 52–55 116–119 52–55 116–119 180–183 244–247

14 56–59 56–59 120–123 56–59 120–123 184–187 248–251

15 60–63 60–63 124–127 60–63 124–127 188–191 252–255

Table 11-3. AMUX-64T Scanning Order for Each MIO or AI Device Input Channel (Continued)

MIO

or AI Device

Channel

AMUX-64T Channels

One

Accessory

Two Accessories Four Accessories

Accessory