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The CIO-DAS1400 is a high-speed low cost multifunction analog and digital I/O board for IBM PC and compatible computers. The board includes many features found in more expensive boards at a fraction of the price.
The CIO-DAS1400 series includes three models, the CIO-DAS1401-12, the CIO-DAS1402-12 and the CIO-DAS-1402-16. The models differ in A/D resolution and input range. The CIO-DAS1401-12 is a high gain board featuring gains of 1, 10, 100 and 1000. Both the CIO-DAS-1402-12 and CIO-DAS1402-16 support low ains,1, 2, 4 and 8. The A/D resolution and input range for each board is given in the table below.
The analog input section of the CIO-DAS1400 has been designed for flexibility and accuracy in a number of configurations. A standard 37 pin D connector brings the analog signals directly into two multiplexers. The two multiplexers may be configured as 16 channels of single-ended input or 8 channels of differential input. A programmable gain amplifier amplifies the signals before entering the A/D converter. The data throughput rate is dependent on the method of triggering and data transfer, as the table below illustrates.
FIFO Provides Full Data Rate Under Windows
The on-board 512 sample FIFO buffer collects the results of A/D conversions and stores them until the computer╒s CPU is able to transfer the data into PC memory. The FIFO buffer allows the PC to store up the A/D transfer requests, then service the requests in batches. The FIFO is necessary to obtain the full data acquisition rates under multitasking operating systems like Windows.
Minimizing Channel to Channel Skew
All of the channels on the CIO-DAS1400 are multiplexed into a single A/D converter. Since there is only one A/D converter on the board, a channel to channel time skew (delay) occurs when scanning multiple channels. With many A/D boards, the time skew is equal to the sample rate, so a 1 KHz sample rate would produce a 1 millisecond skew time. The CIO-DAS1400 features an enhanced triggering mode called the burst mode. In the burst mode the A/D converter is run at its maximum rate for the entire multi-channel scan, thus reducing the channel to channel skew time to the maximum A/D rate which is 3.3 ╡S for the 12-bit boards and 10╡S for the 16-bit board. If even less skew is required, the optional CIO-SSH16 simultaneous sample and hold accessory board can be used to reduce the channel to channel time skew to 0 with 50 nS aperture uncertainty.
Software
The CIO-DAS1400 includes a complete test and calibration program. The program provides a step-by-step procedure for installing and configuring the card. It also creates a configuration file used by the optional Universal Library. The Universal Library is a set of I/O libraries and drivers for those users creating their own custom programs. The Universal Library is compatible with most DOS and Windows based languages and supports the entire CIO family of boards. The Library includes an extensive set of programming examples written in Visual Basic, C and Pascal for both Windows and DOS languages. An optional driver for LabView is also available. The LabView driver works in conjunction with the Universal Library, so both are needed to use the CIO-DAS1400 in LabView.
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