Figure 2-2. Typical External Multiplexer Connections
To make use of external multiplexers, the user must be comfortable reading a simple schematic (such as Figure 2-2) and making
basic connections on a solderless breadboard (such as the EB37 Experiment Board). Initially, it is recommended to test the basic
operation of the multiplexers without the MIO lines connected. Simply connect different voltages to NO0 and NO1, connect
ADDA/ADDB/ADDC to GND, and the NO0 voltage should appear on COM. Then connect ADDA to VS and the NO1 voltage
should appear on COM.
If any of the AIN channel numbers passed to a UE9 function are in the range 16-127 (extended channels), the MIO lines will
automatically be set to output and the correct state while sampling that channel. For instance, a channel number of 28 will cause
the MIO to be set to b100 and the ADC will sample AIN1. Channel number besides 16-127 will have no affect on the MIO. The
extended channel number mapping is shown in Table 2-2.
In command/response mode, after sampling an extended channel the MIO lines remain in that same condition until commanded
differently by another extended channel or another function. When streaming with any extended channels, the MIO lines are all set
to output-low for any non extended analog channels. For special channels (digital/timers/counters), the MIO are driven to
unspecified states. Note that the StopStream can occur during any sample within a scan, so the MIO lines will wind up configured
for any of the extended channels in the scan. If a stream does not have any extended channels, the MIO lines are not affected.
2.7.2 - Converting Binary Readings to Voltages
This information is only needed when using low-level functions and other ways of getting binary readings. Readings in volts already
have the calibration constants applied. The UD driver, for example, normally returns voltage readings unless binary readings are
specifically requested.
Following are the nominal input voltage ranges for the analog inputs.
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