Omega Engineering DAQ-12 user manual 4 D/A Converter 0 Register, 5 D/A Converter 1 Register

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4.1.4D/A Converter 0 Register

An output to this register causes the lower twelve bits of data to be converted to an analog output on D/A converter channel 0. The four most significant bits of data are ignored. This register is 16-bit write only.

4.1.5D/A Converter 1 Register

An output to this register causes the lower twelve bits of data to be converted to an analog output on D/A converter channel 1. The four most significant bits of data are ignored. This register is 16-bit write only.

The remaining four registers are contained in an 8254 counter/timer.

4.1.6Clock Rate Register (low word)

The low word of the clock divider is contained in counter 0 of an 8254 counter/timer. The output of this counter is cascaded into the input of counter 1 to produce a 32-bit timer. Mode 2 must be selected for counter 0 with a minimum count of 2. This register is 8-bit read/write.

4.1.7Clock Rate Register (high word)

The high word of the clock divider is contained in counter 1 of the 8254 counter/timer. Mode 2 must be selected for counter 1 with a minimum count of 2. This register is 8-bit read/write.

4.1.8Multi-Function Timer Register

The multi-function timer is implemented using counter 2 of the 8254 counter/timer. Mode

2must be selected for this timer with a minimum count of 2. This register is 8-bit read/write.

4.1.98254 Control Word/Status Register

This register is used to program the mode and report the status of the 8254 counter/timer. This register is 8-bit read/write.

DAQ-12 Users Manual

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Contents 15,1*,1 WARRANTY/DISCLAIMER Manufacturers Name Manufacturer’s AddressApplication of Council Directive 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 RegisterMulti-Function Timer Register 4 D/A Converter 0 Register5 D/A Converter 1 Register Clock Rate Register low wordProgramming the 8254 Counter/Timer Counter 1 Clock rate register high word Version January 28
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