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Product Specifications
The Lab-PC+ is a low-cost multifunction analog, digital, and timing I/O board for the PC. TheLab-PC+ contains a 12-bit successive-approximation ADC with eight analog inputs, which can be configured as eight single-ended or four differential channels. The Lab-PC+ also has two12-bit DACs with voltage outputs, 24 lines of TTL-compatible digital I/O, and six 16-bit counter/timer channels for timing I/O. The low cost of a system based on the Lab-PC+ makes it ideal for laboratory work in industrial and academic environments. The multichannel analog input is useful in signal analysis and data logging. The 12-bit ADC is useful in high-resolution applications such as chromatography, temperature measurement, and DC voltage measurement. The analog output channels can be used to generate experiment stimuli and are also useful for machine and process control and analog function generation. The 24 TTL-compatible digital I/O lines can be used for switching external devices such as transistors and solid-state relays, for reading the status of external digital logic, and for generating interrupts. The counter/timers can be used to synchronize events, generate pulses, and measure frequency and time. The Lab-PC+, used in conjunction with the PC, is a versatile, cost-effective platform for laboratory test, measurement, and control.
Board Configuration
The Lab-PC+ contains six jumpers and one DIP switch to configure the PC bus interface and analog I/O settings. The DIP switch is used to set the base I/O address. Two jumpers are used as interrupt channel and DMA selectors. The remaining four jumpers are used to change the analog input and analog output circuitry. The parts locator diagram in Figure 2-1 shows the Lab-PC+ jumper settings. Jumpers W3 and W4 configure the analog input circuitry. Jumpers W1 and W2 configure the analog output circuitry. Jumpers W6 and W5 select the DMA channel and the interrupt level, respectively.
PC Bus Interface
The Lab-PC+ is configured at the factory to a base I/O address of hex 260, to use DMA Channel 3, and to use interrupt level 5. These settings (shown in Table 2-1) are suitable for most systems. If your system, however, has other hardware at this base I/O address, DMA channel, or interrupt level, you will need to change these settings on the other hardware or on the Lab-PC+.
Base I/O Address Selection
The base I/O address for the Lab-PC+ is determined by the switches at position U1. The switches are set at the factory for the base I/O address hex 260. This factory setting is used as the default base I/O address value by National Instruments software packages for use with the Lab-PC+. The Lab-PC+ uses the base I/O address space hex 260 through 27F with the factory setting.
Alternative Part No. LAB-PC+, 182095C-01, FAB 182097C-01
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