Campbell SDM-CD16 User manual

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Campbell Scientific, Inc

SDM-CDI6 CONTROL PORT
EXPANSION MODULE WITH DRIVERS
INSTRUCTION MANUAL
REV|SION: 1/92
COPYRIGHT (c) 1987, 1988, CAMPBELL SCIENT|F|C, tNC.

WAR RANTY AND ASSISTANCE
The SDM-CD16 Control Pod Expansion Module with Drivers is warranted by CSlto be free from defects in
materials and workmanship under normal use and service for twelve (12) months from date of shipment unless
specified otherwise. Baneries have no warranty. csl's obligation under this warranty is limited to repairing or
replacing (at CSI's option) defective products. The customer shall assume all costs of removing, reinstalling,
and shipping defective products to CSl. CSI will return such products by sudace carrier prepaid. This warranty
shall not apply to any CSI 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. CSI is not liable for special, indirect, incidenta',
or consequential damages.
Products may not be returned without prior authorization. To obtain a Returned Materials Authorization (RMA),
contact CAMPBELL SCIENTIFIC, lNC., phone [phone]. Atler an application 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 West 1800 North
Logan, Utah 84321
CAMPBELL SCIENTIFIC, lNC. does not accept collect calls.
Non-warranty products returned for repair should be accompanied by a purchase order to cover the repair.
eAMPEIELL SGIENTIFIC, INC'
P.O. Box 551
Logan, UT 84321
Phone [phone]
TLX 453058
FAX [phone]
9525 41st Avenue
Edmonton, Alberta T6E 5X7
CANADA
Phone {403) 461-5158
TLX 037-2966 (EDM)
FAX [phone]
College Road/Sutton Bonington
Loughborough, LE12 5RA
ENGLAND
Phone [phone]
TLX 94016393 (CAMP G)
FAX [phone]

SDM-CDI6
TABLE OF CONTENTS
PAGE
WARRANTY
1. Function 1
2. Specifications........... 1
3. Power Considerations.'.............. 2
4. Connections............. 3
5. Address Selection Jumpers..... 3
6. Datalogger 1nstruction...............". 4
7. Theory of Operation 6
8. Program ExamPle...... 6
Figure 1. SDM-CD16 Face Pane1.......... 1
Figure 2. Application Block Diagram...... 2
Figure 3. Use of External Clamping Diodes For Inductive Loads With Different Supply Voltages 4
Figure 4. Address Jumper Position 5

SDM.CDI6 CONTROL PORT EXPANSION MODULE WITH DRIVERS
Figure 1. SDM-CD16 Face Panel
1. FUNCTION 2. SPECIFICATIONS
The SDM-CD'|6 has 16 digital control ports with Compatible dataloggers: CR10, 21X, CR7.
drivers and is compatible with CSI's CR10, 21X
and CR7 dataloggers (refer to Figure 1). Each Operating voltage: 12 VDC nominal (9 to 18).
pon can be controlled by a datalogger or
controlled manually with an override toggle Current drain at 12 VDC: 6 mA quiescent; 'l1 mA
switch. Each port can be thought of as a switch per active LED (switch on or auto active); 1.4 mA
to ground; closed when active, open when per active poft with switch off.
inactive. The primary function is to activate DC
powered external relays, solenoids, or resistive Maximum power per port from external relay,
loads under datalogger control. solenoid, resistive load: 40 VDC, 0.5 Amps.
The SDM-CD16 is a synchronously addressed Solid state FET protection: Thermalfuse
datalogger peripheral. Datalogger control ports increases in resistance at 1 Amp, allows no
1 , 2, and 3 are used to address the SDM-CD16 current flow after 2 Amps or 125 oC; clamping
then clock out the desired state of each of the '16 diode prevents inductive arcing.
control ports. Up to 16 SDM-CD'l6s may be
addressed, making it possible to control a Total length of connecting cable: 20 feet (CR10,
maximum of 256 ports from the first three 21X) 600 feet (CR7)
datalogger control ports. Toggle switch: ON/OFF manual override;AUTO
l/O Instruction 104 is used by the 21X and CR10 for datalogger control.
to controlthe SDM-CD'|6. The CR7 uses
lnstruction 29. Ensure that the datalogger Physical: 1.7'(H), 7"(L),42"W 1 lb.
contains the appropriate Instruction prior to
system deployment.
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CONTROL PORT EXPANSION WITH DRIVERS
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3.
SDM-CD16 Control Pofi Expansion Module with Drivers
POWER CONSIDERATIONS
The SDM-CD16 power requirements are large
compared to most CSI products. For most
applications an external power supply, as shown
in Figure 2, is recommended to power the SDM-
cD16.
For some applications it may be convenient to
use the datalogger supply to power the SDM-
CD16. For long term applications the lead acid
power supply available with CSI dataloggers
should be used, allowing the batteries to be float
charged. lt is not recommended that the
datalogger alkaline supply be used to power the
SDM-CD16 for long term applications.
lf the datalogger lead acid supply is used, the
number of SDM-CD16's which can be powered is
limited by the 300 mA current sourcing capability
of the wall charger. With a continuous 6 mA
current drain per SDM-CD16 and 11 mA per
active LED, a maximum of 26 LEDs may be
powered by the datalogger, after which,
current is drawn than can be sourced by the
charger. lf this condition is maintained, it will
ultimately lead to battery deep discharge,
requiring new bafteries.
lf the 21X power supply is used to power the
SDM-CD16, all low levelanalog
(thermocouples, pyranometers, thermopiles,
etc.) must be made differentially. This is a
of slight ground potentials created along the
analog terminal strip when the 12V supply is
to power peripherals. This limitation reduces
number of available analog input channels
may mandate an e).ternal supply for the SDM
cD16.
DATALO66ER
DC
POVER
SUPPLY
FIGURE 2. Application Block Diagram