SDM-CD16AC
16-Channel AC/DC Controller
The SDM-CD16AC is a synchronous device
equipped with relay control ports that control
power to each of 16 external ac or dc devices.
Each relay port can be controlled automatically
by the datalogger’s program or controlled man-
ually with an override toggle switch.
The toggle switch has three positions, “ON” and
“OFF” for manual override, and “AUTO” is for
datalogger control. In the “ON” position, the
common (COM) and normally open (NO) con-
tacts are closed. In the “OFF” position, the
normally open contact is open. In the “AUTO”
position, the state of the relay is controlled by
the SDM command issued through the datalog-
ger’s control ports or SDM terminal.
Features
Activates ac or dc devices•
Provides contacts rated at 5 A @ 30 Vdc, •
0.3 A @ 110 Vdc, 5 A @ 125 Vac, and
5 A @ 277 Vac
Includes LED that indicates when a •
port is active
Allows manual override for each port•
Conforms to EN55022-1:1995 and •
EN50082-1:1992
UL/CUL* listed•
Power Considerations
e SDM-CD16AC power requirements are large
compared to most Campbell Scienti c products. For
most applications, an external power supply is recom-
mended to power the SDM-CD16AC.
For some applications it may be convenient to use the
datalogger supply to power the SDM-CD16AC. For
long-term applications, the sealed rechargeable power
supply available with Campbell Scienti c datalog-
gers should be used, allowing the batteries to be oat
charged. It is not recommended that the datalogger
alkaline supply be used to power the SDM-CD16AC
for long-term applications.
SDM Operation
e SDM-CD16AC is a synchronously addressed data-
logger peripheral. Datalogger control ports 1, 2, and 3
are used to address the SDM-CD16AC, then clock out
the desired state of each of the 16 control ports. Up to
16 SDM-CD16ACs may be addressed, making it pos-
sible to control a maximum of 256 ports from the rst
three datalogger control ports.
Datalogger Connection
e CABLE5CBL-L is recommended for connect-
ing the module to the datalogger. A 1- cable length
should be su cient when both datalogger and SDM-
CD16AC are housed within an ENC12/14 enclosure;
a 2- length may be required if the datalogger and
SDM-CD16AC 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.
Ordering Information
Synchronous Device for Measurement
SDM-CD16AC 16-Channel AC/DC Relay Controller 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.
*Underwriters Laboratories (UL) and Canadian Underwriters Laboratories (CUL) listed product. UL and CUL listing number is 5Z21.
(13 pages)
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