SDM-CD16D
16-Channel Digital Control Port Expansion Module
e SDM-CD16D increases the number of digital
outputs that can be controlled (i.e., set to 0 or 5 V) by
a Campbell Scienti c 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 for controlling low voltage valves,
relays, or other devices.
SDM Operation
e SDM-CD16D is a synchronously addressed
datalogger peripheral. Datalogger control ports 1,
2, and 3 are used to address the SDM-CD16D then
clock out the desired state of each of the 16 control
ports. Up to 16 SDM-CD16Ds may be addressed,
making it possible to control a maximum of 256
ports from the rst three datalogger control ports.
Datalogger Connection
The CABLE5CBL-L is recommended for connect-
ing the module to the datalogger. A 1-ft cable
length should be sufficient when both datalogger
and SDM-CD16D are housed within an ENC12/14
enclosure; a 2-ft length may be required if the data-
logger and SDM-CD16D are housed at opposite
ends of an ENC16/18 Enclosure.
e cable length should be as short as possible. Typi-
cally, the maximum cable length is 20 . Contact
Campbell Scienti c if the length needs to be longer.
Power Considerations
The SDM-CD16D power requirements are large
compared to most Campbell Scientific products
when driving significant loads. For many applica-
tions an external power supply is recommended to
power the SDM-CD16D. For some applications, it
may be convenient to use the datalogger supply to
power the SDM-CD16D.
For long-term applications, the sealed rechargeable
power supply available with Campbell Scienti c
dataloggers should be used, allowing the batteries
to be oat charged. Alkaline batteries are not
recommended for long-term applications.
Ordering Information
Synchronous Device for Measurement
SDM-CD16D 16-Channel Digital Control Port Expansion Module
SDM-to-Datalogger Cable
CABLE5CBL-L 5-conductor, 24 AWG cable with drain wire and San-
toprene jacket. Enter cable length, in feet, after the -L.
Must choose a cable termination option (see below).
Cable Termination Options (choose one)
-PT Cable terminates in stripped and tinned leads
for direct connection to a datalogger’s terminals.
-PW Cable terminates in connector for attachment
to a prewired enclosure.
Speci cations
Compatible Dataloggers: CR800, CR850, CR1000, CR3000,
CR5000 (OS version 1.3 or
higher), CR7, CR10(X), CR23X,
and 21X. The SDM-CD16D
is not compatible with the
CR500, CR510, and CR200-
series dataloggers.
Power
Operating Voltage: 12 Vdc nominal (9 to 18 Vdc)
Current Drain @ 12 Vdc: 100 μA typical (all ports HI,
no load)
The SDM-CD16D is intended for low voltage, low power
applications not suitable for the SDM-CD16AC. The unit
cost is also considerably lower.
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