SDM-CD16D 16 Channel Digital
Control Port Expansion Module
Revision: 8/07
Copyright © 2000-2007
Campbell Scientific, Inc.
Warranty and Assistance
The SDM-CD16D 16 CHANNEL DIGITAL CONTROL PORT
EXPANSION MODULE is warranted by CAMPBELL SCIENTIFIC, INC. to
be free from defects in materials and workmanship under normal use and
service for twelve (12) months from date of shipment unless specified
otherwise. Batteries have no warranty. CAMPBELL SCIENTIFIC, INC.'s
obligation under this warranty is limited to repairing or replacing (at
CAMPBELL SCIENTIFIC, INC.'s option) defective products. The customer
shall assume all costs of removing, reinstalling, and shipping defective
products to 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. This warranty is in lieu of all other warranties, expressed or implied,
including warranties of merchantability or fitness for a particular purpose.
CAMPBELL SCIENTIFIC, INC. is not liable for special, indirect, incidental,
or consequential damages.
Products may not be returned without prior authorization. The following
act information is for US and International customers residing in countries
cont
served by Campbell Scientific, Inc. directly. Affiliate companies handle
repairs for customers within their territories. Please visit
www.campbellsci.com to determine which Campbell Scientific company
serves your country. To obtain a Returned Materials Authorization (RMA),
contact CAMPBELL SCIENTIFIC, INC., phone (435) 753-2342. After an
applications engineer determines the nature of the problem, an RMA number
will be issued. Please write this number clearly on the outside of the shipping
container. CAMPBELL SCIENTIFIC's shipping address is:
CAMPBELL SCIENTIFIC, INC.
RMA#_____
815 W
Logan, Ut
CAMPBELL SCIENTIFIC, INC. does not accept collect calls.
est 1800 North
ah 84321-1784
SDM-CD16D Table of Contents
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1. Introduction..................................................................1
2. Control Specifications.................................................2
2.1 General......................................................................................................2
2.2 Output Specifications................................................................................2
3. Power Considerations.................................................3
4. Installation....................................................................4
4.1 Controlled Device Connections................................................................4
5. Address Selection Switches.......................................5
6. Datalogger Instructions ..............................................7
6.1 CRBasic....................................................................................................7
6.2 Edlog.........................................................................................................7
7. Theory of Operation ....................................................8
8. Program Examples......................................................8
8.1 CRBasic Example.....................................................................................9
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
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SDM-CD16D 16 Channel Digital Control Port Expansion Module
The SDM-CD16D (see Figure 1) is a synchronously addressed peripheral. It has 16
control ports.
FIGURE 1. SDM-CD16D
1. Introduction
NOTE
The SDM-CD16D expands the digital output capability of Campbell Scientific
dataloggers. The outputs can be set to 0 or 5 V by the datalogger. In addition to
being able to drive normal logic level inputs, when an output is set HI a ‘boost’
circuit allows it to source a current of up to 100 mA, allowing direct control of
low voltage valves, relays etc.
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.
In CRBasic, instruction SDMCD16AC is used to control the SDM-CD16D. In
Edlog, Instruction 104 is typically used; older CR7 dataloggers use Instruction
29.
Older CR7 dataloggers with pre-OS7.1 software may not have
the necessary instruction. Ensure that your datalogger contains
the appropriate instruction before using.
1
SDM-CD16D 16 Channel Digital Control Port Expansion Module
0.6V Drop
Output
Output
580R
Output set ON/HI Output set OFF/LO
510
R
39
R
V
5V, 0Ω
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)
Total cable length: 6 m (CR10/10X, CR23X, 21X), 180 m (CR7)
2.2 Output Specifications
Output Voltage (no load): Output ON/HI, Nominal 5 V (Minimum 4.5 V)
Output OFF/LO, Nominal 0 V (Maximum 0.1 V)
Output Sink Current: Output will sink 8.6 mA from a 5 V source*
Output Source Current: Output will source 36 mA @ 3 V,
115 mA short-circuited to ground*
NOTE
Max. Output Current: 400 mA at 50°C and 12 V supply (see NOTE below)
(total all outputs)
The maximum current should be derated under the following
conditions: 50 mA for every 10°C above 50°C and/or 50 mA for
every volt above 12 V.
Operating temp.: -25°C to +70°C standard
Size: 230 mm wide x 100 mm high x 24 mm deep
Weight: 350 g
EMC Status: Complies with EN55022-1:1998 and
EN50082-1:1998
* If more detailed output characteristics are required, experienced users should
consult the equivalent circuit diagrams shown in Figure 2, below.
FIGURE 2. Equivalent Output Driver Circuit
2
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