Campbell SDM-AO4A Product Manual Download

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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

12V

- 12 volt supply

- ground

C1 (SDM-C1 on CR3000)

C2 (SDM-C2 on CR3000)

C3 (SDM-C3 on CR3000)

SDM-AO4A to Analog

Output Connections

⏚

- analog

output #1

- ground
- analog

output #2

- ground
- analog

output #3

- ground
- analog

output #4

- ground

The CR3000 has a dedicated SDM port with three terminals.

Summary of Contents for SDM-AO4A

Page 2: ...s under guarantee or not Please state the faults as clearly as possible and if the product is out of the guarantee period it should be accompanied by a purchase order 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 De...

Page 3: ... cell phones and aerials may also not be applicable according to your locality Some brackets shields and enclosure options including wiring are not sold as standard items in the European market in some cases alternatives are offered Details of the alternatives will be covered in separate manuals Part numbers prefixed with a symbol are special order parts for use with non EU variants or for special...

Page 4: ...e beginning work Wear a hardhat and eye protection and take other appropriate safety precautions while working on or around tripods and towers Do not climb tripods or towers at any time and prohibit climbing by other persons Take reasonable precautions to secure tripod and tower sites from trespassers Use only manufacturer recommended parts materials and tools Utility and Electrical You can be kil...

Page 5: ...ons 2 5 Addressing 4 6 Operational Modes 4 7 Programming 6 7 1 CRBasic 7 7 1 1 SDMAO4A Instruction 7 7 1 2 SDMSpeed Instruction 8 7 2 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 Bit Period Values 8 CRBasic Example 7 1 ...

Page 6: ...ullscale Vsupply 12 V 13 mA typical 28 mA typical Iq w load Vsupply 12 V 13 mA load typical 28 mA 2 4 load typical Iq power down mode Vsupply 12 V 1 1 mA typical Range 5 V 0 10 V Resolution 167 µV Accuracy 25 C 20 kOhm load 0 05 of Vout V 500 µV max Accuracy 40 to 60 C 20 kOhm load 0 1 of Vout V 500 µV max Additional Fullscale Error w 50 mA load 1 3 mV typical 1 5 mV typical Max Iout per Channel 5...

Page 7: ...ally TABLE 4 1 p 3 describes the terminal block connections Multiple SDM 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 A 1 ft cable length should be sufficient when both data logger and module are housed within an ENC12 14 enclosur...

Page 8: ... Data Logger Connections 12V 12 volt supply G ground G ground C1 C1 SDM C1 on CR3000 1 C2 C2 SDM C2 on CR3000 1 C3 C3 SDM C3 on CR3000 1 SDM AO4A to Analogue Output Connections 1 2 3 4 analogue output 1 ground analogue output 2 ground analogue output 3 ground analogue output 4 ground 1 The CR3000 has a dedicated SDM port with three terminals ...

Page 9: ...h setting F is reserved for the SDMTrigger instruction TABLE 5 1 SDM AO4A Addressing Address Rotary Switch 0 0 1 1 2 2 3 3 4 4 5 5 6 6 7 7 8 8 9 9 10 A 11 B 12 C 13 D 14 E 15 reserved F 6 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...

Page 10: ...chronous 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 The four outputs then update 1 ms apart SDM Transmission Vout 1 to Vout 4 ...

Page 11: ...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 This section describes how to write an SDM AO4A program using CRBasic An SDM AO4A program can also be generated using Campbell Scientific s Short Cut Program Generator NOTE SDM Transmiss...

Page 12: ... Source must be dimensioned to eight SDMAO4ADest The SDMAO4ADest parameter is a variable that holds a status code indicating success or failure of the instruction Response Code Description 240 Successful 241 Signature error 242 Current overload error 243 Current overload and signature error A current overload error occurs when current overload protection is triggered 130 mA 15 mA A signature error...

Page 13: ...SDMSpeed instruction is used to change the bit period that the data logger uses to clock the SDM data Slowing down the clock rate may be necessary when long cable lengths are used to connect the data logger and SDM devices The syntax of this instruction is as follows SDMSpeed BitPeriod The BitPeriod argument can be an integer or a variable If the SDMSpeed instruction is not in the program a defaul...

Page 14: ...n scaled to 0 to 1000 mVDC and output to a strip chart recorder through the SDM AO4A 7 2 1 CR1000X Program Example Although this program is for a CR1000X data logger programming for other CRBasic data loggers is similar CRBasic Exampe 7 1 CR1000X SDM AO4A Program Example CR1000X SDM AO4A Program Example Measure wind speed wind direction temperature and humidity Scale measurements to 0 to 1000 mV r...

Page 15: ...WD_0_360 1 mV1000 1 Vx1 1 1000 True 1000 60 355 0 Code for temperature humidity measurements Temp_C and RH VoltSe Temp_C 1 mV5000 2 0 0 _60Hz 0 1 40 0 VoltSe RH 1 mV5000 3 0 0 _60Hz 0 1 0 Call Data Table CallTable OneMin Convert 0 360 WD to 0 540 for strip chart use If WD_0_540 270 AND WD_0_360 180 Then WD_0_540 WD_0_360 360 Else WD_0_540 WD_0_360 EndIf Scale the measurements for the SDM AO4A to o...

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