Diamond Systems PR-Z32-E-ST Analog Input Ranges and Resolution, Overview, Input Range Selection

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13.ANALOG INPUT RANGES AND RESOLUTION

13.1 Overview

Prometheus uses a 16-bit A/D converter. The full range of numerical values for a 16-bit number is 0 - 65535. However the A/D converter uses twos complement notation, so the A/D value is interpreted as a signed integer ranging from –32768 to +32767.

The smallest change in input voltage that can be detected is 1/(216), or 1/65536, of the full-scale input range. This smallest change results in an increase or decrease of 1 in the A/D code, and so this change is referred to as 1 LSB, or 1 Least Significant Bit.

The analog inputs on Prometheus have three configuration options:

♦Single-ended or differential mode

♦Unipolar or bipolar mode

♦Input range (gain)

The single-ended / differential and unipolar / bipolar configuration is done with a jumper on jumper block J13 (see page 45), and the input range selection is done in software.

13.2 Input Range Selection

Prometheus can be configured to measure both unipolar (positive only) and bipolar (positive and negative) analog voltages. This configuration is done with a jumper and applies to all inputs. In addition you can select a gain setting for the inputs, which causes them to be amplified before they reach the A/D converter. The gain setting is controlled in software, so it can be changed on a channel-by-channel basis. In general you should select the highest gain (smallest input range) that will allow the A/D converter to read the full range of voltages over which your input signals will vary. However, if you pick too high a gain, then the A/D converter will clip at either the high end or low end, and you will not be able to read the full range of voltages on your input signals.

13.3 Input Range Table

The table below indicates the analog input range for each possible configuration. The polarity is set with a jumper on jumper block J13, and the gain is set with the G1 and G0 bits in the register at Base + 3. The Gain value in the table is provided for clarity. Note that the single-ended vs. differential setting has no impact on the input range or the resolution.

Polarity

G1

G0

Input Range

Resolution (1 LSB)

Bipolar

0

0

±10V

305∝V

 

Bipolar

0

1

±5V

153∝V

Bipolar

1

0

±2.5V

76∝V

Bipolar

1

1

±1.25V

38∝V

Unipolar

0

0

Invalid

 

 

Unipolar

0

1

0 – 10V

153∝V

Unipolar

1

0

0 – 5V

76∝V

Unipolar

1

1

0 – 2.5V

38∝V

Prometheus CPU User Manual V1.44

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Contents Prometheus Table of Contents 22.4 22.2CPU DescriptionProcessor Section FeaturesSystem Features Digital I/O Counter/TimersAnalog Input Analog OutputPrometheus Board Drawing Cable B Main I/O Connector J3O Headers Cable aIR RX, IR TX Connector Part NumbersCOM1 COM4 LPT1Input Power J11 USB J5 Output Power J12Ethernet J4 Watchdog/Failsafe Features J6 Auxiliary Serial Port Connector J15IDE Drive J8 Floppy Drive J7Signal Name Definition Data Acquisition I/O Connector J14 Model PR-Z32-EA onlyJ2 PC/104 16-bit bus connector J1 PC/104 8-bit bus connector 11 PC/104 Bus ConnectorsCmos RAM Jumper ConfigurationJ10 System Configuration J6 Watchdog Timer & System Recovery CPU Chip Selects System FeaturesSystem Resources Console Redirection to a Serial Port Watchdog Timer Flash Memory Failsafe Mode / Bios RecoveryBackup Battery System ResetDOS BiosBios Settings Bios Download / Recovery Operating System Formatting Initial SetupDisk-On-Board Flash File Storage Life Cycle Management and Calculations Known LimitationsEthernet System I/OParallel Port Serial PortsInstalling an OS From a Floppy Drive onto a Flashdisk Module Booting to DOS From a Floppy DriveInstalling an OS from a Hard Disk onto a Flashdisk Module Data Acquisition Circuit LSB Data Acquisition Circuitry I/O MAPBase Address Base + Write Function Read FunctionAD7 AD6 AD5 AD4 AD3 AD2 AD1 AD0 Data Acquisition Circuit Register MapBase + Command RegisterRegister Bit Definitions AD9 AD8 Base + ReadValue = Base + 0 value + Base + 1 value Base + Write Not Used ReadBase + Read/Write Channel Register Base + Write Analog Input Gain STS Wait Dacbsy OVF Scanen Base + Read Analog Input StatusFT5 FT4 FT3 FT2 FT1 FT0 Base + Read/Write Interrupt / DMA / Counter ControlCKSEL1 CKFRQ1 CKFRQ0 Adclk Dmaen Tinte Dinte Ainte Base + Read/Write Fifo ThresholdFD5 FD4 FD3 FD2 FD1 FD0 Base + WriteDA7 DA6 DA5 DA4 DA3 DA2 DA1 DA0 Base + Read Channel and Fifo StatusBase + Read Analog Operation Status Base + Write DAC MSB + Channel NoDACH1 DACH0 DA9 DA8Dioctr = Base + Read / WriteBase + Read / Write Digital I/O Control Register Dioctr Dira Dirch Dirb DirclBase + Read/Write Counter/Timer D23 Base + Read/Write Counter/Timer D7Base + Read/Write Counter/Timer D15 Ctrno Latch Gtdis Gten Ctdis Cten Load CLR Base + Write Counter/Timer Control RegisterREV7 REV6 REV5 REV4 REV3 REV2 REV1 REV0 Base + Read Fpga Revision CodeData Acquisition Circuit Configuration Unipolar / Bipolar Inputs Analog Output ConfigurationSingle-ended / Differential Inputs Input Range Selection Analog Input Ranges and ResolutionInput Range Resolution 1 LSB OverviewPerforming AN A/D Conversion LSB = inpbase MSB = inpbase+1 Perform an A/D conversion on the current channelInput voltage = A/D value / 32768 * Full-scale input range 15.A/D SCAN, INTERRUPT, and Fifo Operation Ainte Scanen Prometheus A/D Operating ModesLOW, High LSB = Output voltage range Analog Output Ranges and ResolutionResolution DescriptionREF 1 LSB 16.4 D/A Conversion Formulas and TablesConversion Formulas for Bipolar Output Ranges Generating AN Analog Output 18.3 A/D full-scale Analog Circuit Calibration18.1 A/D bipolar offset 18.2 A/D unipolar offsetDigital I/O Operation Counter 1 Counting/Totalizing Functions COUNTER/TIMER OperationCounter 0 A/D Sample Control Counter Command SequencesCounter Outpbase+15,0x01 Outpbase+15,0x81 Data Acquisition Specifications Flashdisk Module ConfigurationUsing the Flashdisk with Another IDE Drive Power Supply23. I/O Panel Board USB a Panel Board I/O ConnectorsPanel Board Top Side / External Use I/O Connectors Location Type DescriptionJ12 pinout to/from DC/DC power supply Panel Board Power ConnectionsJ3 Pinout J5 USB J9 Pinout InstallationFlash Disk Programmer Board Cable Kit C-PRZ-KIT 25.I/O CablesPhoto No Cable No Description PL5 pin no DB15F pin no Signal VGA Accessory BoardPL5 pin no PL5 Signal J25 pin no J25 Signal Website information Prometheus Connector Manufacturer Manufacturer Part NoMounting Prometheus on a Baseboard LinksPage 28.PC/104 Mechanical Drawing

PR-Z32-E-ST, PR-Z32-EA-ST specifications

The Diamond Systems PR-Z32-EA-ST and PR-Z32-E-ST are pioneering solutions in the realm of embedded computing systems, designed to meet the challenging demands of various industrial applications. These boards harness advanced technologies and a comprehensive feature set to ensure exceptional performance, flexibility, and reliability.

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