Related Manuals for Campbell SDM-CD16D
Summary of Contents for Campbell SDM-CD16D
- Page 1 SDM-CD16D 16 Channel Digital Control Port Expansion Module Revision: 8/07 C o p y r i g h t © 2 0 0 0 - 2 0 0 7 C a m p b e l l S c i e n t i f i c ,...
- Page 2 CAMPBELL SCIENTIFIC, INC. CAMPBELL SCIENTIFIC, INC. will return such products by surface carrier prepaid. This warranty shall not apply to any CAMPBELL SCIENTIFIC, INC. products which have been subjected to modification, misuse, neglect, accidents of nature, or shipping damage.
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Page 3: Table Of Contents
8.2 Edlog Example ..................9 Figures 1. SDM-CD16D....................1 2. Equivalent Output Driver Circuit ...............2 3. Connection Block Diagrams...............3 4. Use of Terminal Blocks ................5 5. Address Selection Switch ................6 Tables 1. Datalogger to SDM-CD16D Connections ..........4 2. Switch Position and Addresses..............6... - Page 4 This is a blank page.
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Page 5: Introduction
The SDM-CD16D is a synchronously addressed datalogger peripheral. Three ports on the datalogger are used to address the SDM-CD16D then clock out the desired state of each of the 16 control ports. Up to sixteen SDM-CD16Ds may be addressed, making it possible to control a maximum of 256 ports from three datalogger SDM ports. -
Page 6: Control Specifications
SDM-CD16D 16 Channel Digital Control Port Expansion Module 2. Control Specifications 2.1 General Compatible dataloggers: CR800, CR850, CR1000, CR3000, CR5000, CR10(X), CR23X, CR7 and 21X Operating voltage: 12 VDC nominal (9 to 18 V) Current drain at 12V DC: 100 µA typical (All ports HI, no load) -
Page 7: Power Considerations
SDM-CD16D. For some applications it may be convenient to use the datalogger supply to power the SDM-CD16D, as shown in Figure 3. For long-term applications, the lead-acid power supply available with Campbell Scientific dataloggers should be used, allowing the batteries to be float charged. Alkaline batteries are not recommended for long term applications. -
Page 8: Installation
SDM-CD16D 16 Channel Digital Control Port Expansion Module 4. Installation For correct operation the SDM-CD16D must be installed where there is no risk of water ingress or condensation. The order in which connections are made is critical. CAUTION Always connect 12 V first, followed by ground, then the control ports. -
Page 9: Address Selection Switches
FIGURE 4. Use of Terminal Blocks 5. Address Selection Switches Each SDM-CD16D can have 1 of 16 addresses. The factory-set address is 00. Table 2 shows switch position and the corresponding address. Figures 1 and 5 show the position of the switch. Note that you will have to remove the... -
Page 10: Address Selection Switch
SDM-CD16D 16 Channel Digital Control Port Expansion Module TABLE 2. Switch Position and Addresses Switch Setting Base 4 Address Use a screwdriver to select address FIGURE 5. Address Selection Switch... -
Page 11: Datalogger Instructions
CR1000, CR3000, and CR5000 dataloggers. With this instruction, a port on an SDM-CD16D is enabled/disabled (turned on or off) by sending a value to it. A non-zero value will enable the port; a zero value disables it. The values to be sent to the SDM-CD16D are held in the Source array. -
Page 12: Theory Of Operation
33, outputs 1 to 16 of the first SDM-CD16D are set according to input locations 33 to 48, and outputs 1 to 16 of the second SDM-CD16D are set according to input locations 49 to 64. -
Page 13: Program Examples
The first eight bits clocked out represent the SDM-CD16D address. If the address matches the SDM-CD16D’s address, the SDM-CD16D is enabled. If enabled, the next 16 bits are shifted into the SDM-CD16D, each bit controlling one port, the first of which controls output 1. - Page 14 SDM-CD16D 16 Channel Digital Control Port Expansion Module Cooling unit: Activate when temperature >27.5°C. Deactivate when temperature <24.5°C. Mixing fan: Activate whenever the heating or cooling units are activated. Activate for 5 minutes out of every 15 minutes. The program assumes that the temperature measurements have been made, and that the average temperature for each greenhouse is computed and stored in input locations 1 to 5.
- Page 15 SDM-CD16D 16 Channel Digital Control Port Expansion Module 5: If (X<=>F) (P89) if the heater is on (heater 1: 10 -- X Loc [ Heat_1 ] control location <>0) 2: 2 <> 3: 0 4: 30 Then Do then 6: If (X<=>F) (P89)
- Page 16 SDM-CD16D 16 Channel Digital Control Port Expansion Module 16: If (X<=>F) (P89) check lower threshold to 1: 1 -- X Loc [ Temp_1 ] see if cooler should be 2: 4 < turned off 3: 24.5 4: 30 Then Do...
- Page 17 3: 22 Set Flag 2 Low End fan control logic based on time Input locations 10 to 24 are now loaded with a ‘1’ or ‘0’ to set ports on the SDM-CD16D 38: SDM-CD16 / SDM-CD16D (P104) send instructions to the...
- Page 18 SDM-CD16D 16 Channel Digital Control Port Expansion Module *Table 3 Subroutines End Program -Input Locations-1 Temp_1 7 4 0 2 Temp_2 10 0 0 3 Temp_3 10 0 0 4 Temp_4 10 0 0 5 Temp_5 18 0 0 6 _________ 0 0 0...
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- Page 20 Campbell Scientific Companies Campbell Scientific, Inc. (CSI) 815 West 1800 North Logan, Utah 84321 UNITED STATES www.campbellsci.com info@campbellsci.com Campbell Scientific Africa Pty. Ltd. (CSAf) PO Box 2450 Somerset West 7129 SOUTH AFRICA www.csafrica.co.za cleroux@csafrica.co.za Campbell Scientific Australia Pty. Ltd. (CSA)
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