Related Manuals for Campbell SDM-AO4A
Summary of Contents for Campbell SDM-AO4A
- Page 1 SDM-AO4A Four-Channel Analog Output Module Revision: 01/2021 Copyright © 1986 – 2021 Campbell Scientific, Inc. Arrow.com. Downloaded from...
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Page 2: 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 3: Introduction
SDM-AO4A Four-Channel Analog 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 4: 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 5: Front Panel Of The Sdm-Ao4A
SDM-AO4A Four-Channel Analog 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 6: 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 7: Synchronous Mode
SDM-AO4A Four-Channel Analog 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 10V step change. -
Page 8: 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 9: 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 10: Sdmspeed() Instruction
SDM-AO4A Four-Channel Analog 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 11: 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 12 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)
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