Omega Engineering DAQ-12 user manual Interrupts, External Interrupt

Page 22

2.8Interrupts

The DAQ-12 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-12 control word register. The interrupt level is selected using the jumpers J10 and J11 as shown in Figure 2-11.

J10

J11

IRQ 14

IRQ 15

IRQ 12

IRQ 11

IRQ 10

IRQ 2

IRQ 3

IRQ 4

IRQ 5

IRQ 6

IRQ 7

Factory default = IRQ 5

Figure 2-11. Jumpers J10 and J11 Configuration

2.8.1External Interrupt

The external interrupt is a TTL compatible input from the D-62 connector. An interrupt request is generated on a high to low transition of this input.

DAQ-12 Users Manual

22

Image 22

Contents 15,1*,1 WARRANTY/DISCLAIMER Application of Council Directive Manufacturers NameManufacturer’s Address Standards to which Conformity is DeclaredFor immediate technical or application assistance Servicing North AmericaServicing Europe Page Table of Contents Introduction List of Figures and Tables Installation DAQ-12 Specifications Jumper J1 Configuration Analog to Digital ConverterDisable Pre-Scaler Enable Pre-Scaler Factory default Recommended Input Ranges and Gain Settings Code Digital to Analog Converters Voltage Unipolar Bipolar CodeChannel Bipolar Gain =Digital Input/Output Base AddressClock Selection Internal Clock External Clock Trigger Selection Start of ConversionDirect Memory Access 10. Jumpers J8 and J9 Configuration DackInterrupts External InterruptExternal Connections Page Register Description Control Word RegisterINT2 INT1 INT0 Description Start of Conversion Register 3 A/D Converter Data Register5 D/A Converter 1 Register Multi-Function Timer Register4 D/A Converter 0 Register Clock Rate Register low wordProgramming the 8254 Counter/Timer Counter 1 Clock rate register high word Version January 28