Campbell SDM-AO4A Product Manual
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Campbell SDM-AO4A Product Manual

Four-channel analogue output module
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SDM-AO4A
Four-Channel
Analogue Output
Module
Revision: 01/2021
Copyright © 1986 – 2021
Campbell Scientific
CSL I.D - 915

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Summary of Contents for Campbell SDM-AO4A

  • Page 1 SDM-AO4A Four-Channel Analogue Output Module Revision: 01/2021 Copyright © 1986 – 2021 Campbell Scientific CSL I.D - 915...
  • Page 2 Quotations for repairs can be given on request. It is the policy of Campbell Scientific to protect the health of its employees and provide a safe working environment, in support of this policy a “Declaration of Hazardous Material and Decontamination”...
  • Page 3 About this manual Please note that this manual was originally produced by Campbell Scientific Inc. primarily for the North American market. Some spellings, weights and measures may reflect this origin. Some useful conversion factors: Area: 1 in (square inch) = 645 mm Mass: 1 oz.
  • Page 4 • Periodically (at least yearly) check electrical ground connections. WHILE EVERY ATTEMPT IS MADE TO EMBODY THE HIGHEST DEGREE OF SAFETY IN ALL CAMPBELL SCIENTIFIC PRODUCTS, THE CUSTOMER ASSUMES ALL RISK FROM ANY INJURY RESULTING FROM IMPROPER INSTALLATION, USE, OR MAINTENANCE OF TRIPODS, TOWERS, OR ATTACHMENTS TO TRIPODS AND TOWERS...

  • Page 5: Table Of Contents

    7.1.1 SDMAO4A() Instruction ..............7 7.1.2 SDMSpeed() Instruction ...............8 Programming Example .................9 7.2.1 CR1000X Program Example............9 Figures 4-1. Front Panel of the SDM-AO4A ............3 6-1. Synchronous Mode ................5 6-2. Sequential Mode...................6 Tables 4-1. Description of Terminal Block Connections ........3 5-1. SDM-AO4A Addressing ..............4 7-1.

  • Page 6: Introduction

    SDM-AO4A Four-Channel Analogue Output Introduction The SDM-AO4A is designed to output four continuous voltages at levels set by a Campbell Scientific data logger. NOTE For Edlog and other retired data logger support, view an older version of this manual at www.campbellsci.com/old-manuals.

  • Page 7: Power Supply

    Multiple SDM- (p. 3) AO4As may be used by connecting the data logger side of one SDM-AO4A to the next as long as each SDM-AO4A is set to a unique address. The CABLE5CBL-L or similar cable is used to connect the module to the data logger.

  • Page 8: Front Panel Of The Sdm-Ao4A

    SDM-AO4A Four-Channel Analogue Output FIGURE 4-1. Front Panel of the SDM-AO4A TABLE 4-1. Description of Terminal Block Connections SDM-AO4A to Data Logger Connections - 12 volt supply - ground - ground C1 (SDM-C1 on CR3000) C2 (SDM-C2 on CR3000) C3 (SDM-C3 on CR3000)

  • Page 9: Addressing

    15 (reserved) Operational Modes The SDM-AO4A can be operated in ±5 V mode or 10 V mode. In each of these modes, the SDM-AO4A can operate synchronously or sequentially. In synchronous mode, all channels are set at the same time. This mode is slower since for large changes in voltage it may take multiple charging cycles to arrive at the final voltage.

  • Page 10: Synchronous Mode

    SDM-AO4A Four-Channel Analogue Output SDM Transmission Vout 1 to Vout 4 FIGURE 6-1. Synchronous Mode In sequential mode, the channels are set sequentially. The output signal can take from 600 µsecs to 1 ms (worst case) to settle to 16-bit resolution with a...

  • Page 11: Programming

    CRBasic Editor or Short Cut, included with PC400 and LoggerNet. In CRBasic, the SDMAO4A() programming instruction allows the user to set four separate voltage levels in one SDM-AO4A, or more voltage levels with multiple SDM-AO4As. Voltage levels are reset each time the instruction is executed.

  • Page 12: Crbasic

    Any other response code returned indicates failed communication. SDMAddress: The SDMAddress parameter defines the address of the first SDM-AO4A to which a voltage should be applied. Valid SDM addresses are 0 through 14. Address 15 is reserved for the SDMTrigger() instruction.

  • Page 13: Sdmspeed() Instruction

    SDM-AO4A Four-Channel Analogue Output SDMAO4AOption: The SDMAO4AOption parameter is used to set the operating mode for the SDMAO4A. Option Code Description Power down 5V synchronous 5V sequential 10V synchronous 10V sequential In the synchronous mode, all channels are set at the same time. This mode is slower since for large changes in voltage it may take multiple charging cycles to arrive at the final voltage.

  • Page 14: Programming Example

    Programming Example The following program example is given to help the user understand the general principles involved in the use of the SDM-AO4A with Campell Scientific data loggers. This example program is for weather stations with a data logger measuring wind speed, wind direction, temperature, and relative humidity.
  • Page 15 WDOut = WD_0_540 *1.852 'WD: 0-540 deg = 0-1000mV TempOut= 10*(Temp_C+40) 'Temp: -40-60 deg C = 0-1000 mV RHOut = RH *10 'RH: 0-100 % RH = 0-1000 mV 'Send mV outputs to SDM-AO4A at SDM Address 12 (Rotary Switch at C) SDMAO4A (AO4AOutput(),AO4AResponse,12,1,4,1)
  • Page 16 Campbell Scientific regional offices Australia France Thailand Location: Garbutt, QLD Australia Location: Vincennes, France Location: Bangkok, Thailand Phone: 61.7.4401.7700 Phone: 0033.0.1.56.45.15.20 Phone: 66.2.719.3399 Email: info@campbellsci.com.au Email: info@campbellsci.fr Email: info@campbellsci.asia Website: www.campbellsci.com.au Website: www.campbellsci.fr Website: www.campbellsci.asia Brazil Germany Location: São Paulo, SP Brazil...

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