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The digital output signal is pin 26. Pin 26 is SER DAT OUT and is equivalent to the SCXIbus MISO serial data output line. The digital I/O signals of the SCXI-1141/1142/1143 module correspond to the digital I/O lines of an E/M Series DAQ device. Table 2-4 lists the equivalencies. The digital timing signals are pins 36 and 43: • Pin 36 is SCAN CLK, the signal used as a clock for the SCXI-1141/1142/1143 module multiplexer counter. The DAQ device pulses this signal at the end of each conversion if the module is in multiplexed mode. • Pin 43 is a reserved digital input. Table 2-4. SCXIbus to SCXI-1141/1142/1143 Module Rear Signal Connector to DAQ Device Pin Equivalencies SCXIbus Line SCXI-1141/1142/1143 Rear Signal Connector E/M Series DAQ Device MOSI SER DAT IN DIO0 D*/A DAQ D*/A DIO1 INTR* SLOT 0 SEL* DIO2 SPI CLK SER CLK EXT STROBE* MISO SER DAT OUT DIO4 Note: An * means the signal is asserted low. © National Instruments Corporation 3-1 SCXI-1141/1142/1143 User Manual 3 Configuring and Testing This chapter discusses configuring the SCXI-1141/1142/1143 in MAX using NI-DAQmx, creating and testing a virtual channel, global channel, and/or task. Notes NI recommends that you have NI-DAQmx 8.3 or later installed. Refer to the SCXI Quick Start Guide if you have not already configured the chassis. SCXI-1141/1142/1143 Software-Configurable Settings This section describes how to set the gain/input signal range and how to configure your software for compatible sensor types. It also describes how to perform configuration of these settings for the SCXI-1141/1142/1143 in NI-DAQmx. For more information on the relationship between the settings and the measurements and how to configure settings in your application, refer to Chapter 4, Theory of Operation. Common Software-Configurable Settings This section describes the most frequently used software-configurable settings for the SCXI-1141/1142/1143. Refer to Chapter 4, Theory of Operation, for a complete list of software-configurable settings. Gain/Input Range Gain/input range is a software-configurable setting that allows you to choose the appropriate amplification to fully utilize the range of the E/M Series DAQ device. In most applications NI-DAQ chooses and sets the gain for you determined by the input range. This feature is described in Chapter 4, Theory of Operation. Otherwise, you should determine the appropriate gain using the input signal voltage range and the full-scale limits of the SCXI-1141/1142/1143 output. You can select a gain of 1, 2, 5, 10, 20, 50, or 100 on a per channel basis. Chapter 3 Configuring and Testing SCXI-1141/1142/1143 User Manual 3-2 Input Selection The front end of the SCXI-1141/1142/1143 includes a software configurable switch that allows you to programmatically connect the input channels of the SCXI-1141/1142/1143 to either the front connector or internal ground. Refer to Table 5-1, NI-DAQmx Voltage Measurement Properties, for details about the available input coupling modes supported by the SCXI-1141/1142/1143.