Remote Technologies RPC-320 manual Analog Input Section, Calibration

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ANALOG INPUT

SECTION 10

Voltage outputs from pins 6 and 10 are generated by the RS-232 chip U8. Both of these voltages go through a 100 ohm resistor to H1-10 and H1-6. Pin 10 goes to 0 volts when operating the board in IDLE m odes 1 or 2. Pin 6 goes to about + 5 volts. These voltages may be used to supply power to very low pow er amplifier s.

CALIBRATION

The A /D comes fa ctory ca librated for a 0 to 5V inpu t. This range is chan ged by adjusting R17. You can adjust the range to 5.12V. This is useful when the input is 0 - 5V and you want to know when the input is over-range.

To calibrate or adjust the voltage reference:

1.Connect the voltmeter ground to a GN D point on the Analog IN terminal strip . Make sure there are no other connections to the analog ground.

2.Connect the voltmeter ' + ' lead to U14, pin 6.

3.Adjust R5 for 5.00 VDC or other voltage as desired. D o not exceed 5.2 or go below 4. 8 volts.

COMMANDS

The following RPBASIC-52 com mands are used for analog I/ O. Mor e inform ation is found in the appendix of this manu al.

Comm and	Function
AIN(n)	Returns analog value.
CON FIG AIN (n)	Configures analog input
	channels

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Contents REV TrademarksRevision Table of Contents Interrupt Characteristics Sect ION 11 Watchdog Timer DescriptionExternal Reset Sect ION 13 Multi Mode Counter DescriptionSoftware Revision History Description OverviewSection Manual OrganizationSymbols and Term inology Technical SupportOverview Section System layoutOperating Precautions IntroductionEquipment First Time Operation Using a PCUsing a Terminal Uploading and Downloading ProgramsEditing programs and program ming hints Where to GO from Here TroubleshootingEprom Saving ProgramsSaving a Program W3 autorun jumperLoading a Program AutorunningPreventing Autorun Changing Eprom SizeBload CommandsAlternate Eproms BsaveSerial Ports COM0 Serial PortCOM1 Serial Port Serial Ports Section RS-422/485 Operating InformationRS-422/485 Termination network Accessing Serial Buffers Two wire RS-485Multidrop Network Accessing COM0 and COM1 Disabling CONTROL-CSerial Port PIN OUT RXD CTS RAM Memory Battery BackupChecking the battery Changing MemoryReserved Memory Storing Variables in RAMAssembly Language Interface Block Data TransferDigital and Opto Ports Digital I/O PortsDigital Por t J3 High Current Port L8 Digital I/O CommandsDigital Port P6 Optically Isolated InputHigh Current Output Interfacing to switches and other devices Interfacing Digital I/O to an opto-module rackDigital I/ O prog ramm ing exam ple Ls e Width Modulation PWM Digital and Opto Ports Section Conne ctor pin ou t J3Line Config LineCount Line BSetting Date and Time DateM E Section Connecting Displays Writing to the DisplayProgramming Example Display Connector PIN OUT Display TypesKeypad Port Program explanationKeypad Port PIN OUT J5 Initialization Connecting Analog InputsAnalog Input Overvoltage conditionsDifferential Mode Examples u sing CON FIG AINAcquiring Analog Data Temperature Measurement Noise NotesAnalog Input Section Data logging on a timer tick Measuring Higher VoltagesConverting Analog Measurements AmplifiersMeasuring 4-20 mA current loops Calibration Watchdog Timer External ResetInterrupt Characteristics Optically Isolated InterruptProgram Example Optically isolated and TTL interrup ts Load ProgrammingGND GateCOU NT0 Power Management Further Power ReductionPower Management Section Program Examp leElectrical Specifications Technical InformationJumper Descriptions Mechanical SpecificationsMemory and I/O Bank MAP Bank