Omega DAQ-16 - Manuals

Declaration of Conformity Manufacturer's Name: Omega Engineering Inc. Manufacturer's Address: One Omega DriveStamford, CT 06907-0047 Application of Council Directive: 89/336/EEC Standards to whichConformity is Declared: * EN50081-2 (EN55022, EN60555-2, EN60555-3)* EN50082-1(IEC 801-2, IEC 801-3, &am...

Table of Contents 28 4.2 Programming the 8254 Counter/Timer . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 4.1.8 8254 Control Word/Status Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 4.1.7 Multi-Function Timer Register . . . . . . . . . . . . . . . . ...

List of Figures and Tables 25 Table 4-1. DAQ-16 Address Map . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 Table 2-3. Jumper J4 Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Table 2-2. A/D Conv...

1. Introduction The DAQ-16 is a high speed data acquisition adapter for IBM AT compatible machinesoffering eight differential analog input channels with 16-bit resolution, two analog outputchannels with 12-bit resolution and four digital input/output lines. Other features of theDAQ-16 include: Analo...

1.2 DAQ-16 Specifications DACK 5, 6, 7 DRQ 5, 6, 7 DMA Levels: IRQ 2, 3, 4. 5, 6, 7, 10, 11, 12, 14, 15 Interrupt Levels: 0000H - FFFFH I/O Address Range: ISA 16-bit Bus Interface: 491.4mA 374.9 mA +12 volts --- --- -12 volts 1204.9mA 1069.0 mA +5 volts --- --- -5 volts I(ms) I(t) Power Supply Power...

2. Circuit Board Description and Configuration The base address of the DAQ-16 is selected using switches SW1 and SW2. The operatingmode of the DAQ-16 is controlled by jumpers J1 through J7, while DMA and interruptselections are set with jumpers J8 through J11. Connections to external equipment are m...

The final stage of the A/D converter circuit is the A/D converter IC. The converter must beconfigured for unipolar or bipolar input voltages and for binary or 2's complement dataconversion. These options are selected using jumper J5 as shown in Figure 2-3 below. 4 5 6 1 2 3 J5 4 5 6 1 2 3 J5 4 5 6 1...

+32,767 +32,767 +65,535 +65,535 +Vmax +16,384 0 +49,152 +32,768 +Vmax/2 0 -32,768 +32,768 0 0 -16,384 n/a +16,384 n/a -Vmax/2 -32,768 n/a 0 n/a -Vmax bipolar unipolar bipolar unipolar 2’s Complement 2’s Complement Binary Binary Voltage Table 2-2. A/D Conversion Format Examples In order to calculate ...

2.2 Digital to Analog Converters The digital to analog (D/A) section of the DAQ-16 consists of two independent 12-bitmultiplying D/A converters, and two independent two-stage output amplifiers. Digital data,(output to the D/A converter by the CPU), is converted to an analog voltage by the D/Aconvert...

5 6 7 8 1 2 3 4 J4 Channel 1 gain Channel 1 select Channel 0 select Channel 0 gain Figure 2-5. Jumper J4 Configuration Table 2-3 lists configuration options for jumper J4. connect 4-8open 4-8 connect 2-6open 2-6 Gain = 1Gain = 2 connect 3-7open 3-7 connect 1-5open 1-5 BipolarUnipolar Channel 1 Chann...

2.4 Base Address The DAQ-16 uses 16 consecutive I/O address locations in the range 0 to 0FFFFH. Twosix-position switches (SW1 and SW2) are used to select the base address. SW1 controlsaddress lines A15 - A10, and SW2 controls A9 - A4. Address lines A3 - A0 are usedinternally by the DAQ-16 to select ...

2.5 Clock Selection The DAQ-16 is equipped with a programmable clock circuit to produce data sampling ratesindependent from the clock rate of the host computer. An onboard 8254 programmableinterval timer, with a 10 MHz clock input and either two or three cascaded 16-bit timers,provides the sampling ...

2.5.1 Internal Clock Sampling rates for the internal clock can be calculated using the following equation: t = 100ns * [N1*N2] or f = 10MHz / [N1*N2] where N1 is the low 16-bits of the clock divider and N2 is the high 16-bits of the clockdivider. The following criteria must be met when selecting val...

When configured for a 48-bit divider, the first sampling period will be slightly longer thanthe others because the first clock period is required to load the initial value of themulti-function timer. The following equation calculates the additional time of the first period: t = 100ns * [N1 * N2] add...

When the multi-function timer is used as a pre-divider, the frequency of the external clockinput may be varied from DC to 10 MHz as long as the high portion of the clock is at least30ns and the low portion is at least 50ns. Except for the first period, the sampling rate of theDAQ-16 will be the exte...

2.7 Direct Memory Access Direct Memory Access (DMA) transfers provide a way of transferring data from theDAQ-16's A/D converter into the computer's memory without using the Central ProcessingUnit (CPU). DMA capability enables other system software to be executed while data is beinginput from the DAQ...

2.8 Interrupts The DAQ-16 is capable of generating an interrupt from one of four sources: 1. End of conversion signal 2. DMA terminal count 3. Multi-function timer output 4. External interrupt input The interrupt source is software selected through the DAQ-16 control word register. Theinterrupt leve...

3. External Connections The DAQ-16 is equipped with a high density 62-pin connector as shown in Figure 3-1. 2 - CH1+ 4 - CH2-6 - CH4+8 - CH5- 10 - CH7+ 12 - AOUT0 14 - DOUT0 6 - DOUT3 18 - EXT TRIG 20 - DIN1 22 - CH0+ 24 - CH1- 26 - CH3+ 28 - CH4- 30 - CH6+ 32 - CH7- 34 - AOUT1 36 - DOUT138 - EXT IN...

CH0-,CH0+,...,CH7-,CH7+ : Analog inputs to the analog to digital converter. Amplitude andpolarity depend upon jumper settings. The input resistance of these lines is 1.5K ohmstypical. AOUT0, AOUT1: Analog outputs from the digital to analog converters. Polarity andmaximum amplitude depend on the jump...

4. Register Description and Programming The DAQ-16 uses 16 consecutive I/O address locations in the range 0 to FFFFH. The cardutilizes these addresses for the registers listed in Table 4-1. (* indicates registers located in8254 counter). Read/Write 8-bit 8254 Control Word/Status Register Base F * Re...

4.1.2 Start of Conversion Register The start of conversion register is 16-bit write only and performs two functions: 1. When configured for internal triggering, writing a "0" to this register generates the software trigger, starting the data conversion process. 2. Writing a "0" to th...

4.2 Programming the 8254 Counter/Timer This section provides programming information for the 8254 counter/timer as implementedon the DAQ-16. For more details on the 8254, consult the Intel Micro-Processor and PeripheralHandbook. To program any of the counters contained in the 8254 counter/timer, thr...