Campbell SDM-CD16AC, Product Manual

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SDM-CD16AC 16 Channel AC/DC Controller
4
Multiple SDM-CD16ACs may be wired in parallel by connecting the data
logger side of one SDM-CD16AC to the next. The CABLE5CBL-L or an
equivalent cable is used to connect the module to the data logger. A 0.3 m (1 ft)
cable length should be sufficient when both data logger and SDM-CD16AC are
housed within an ENC12/14; a 0.6 m (2 ft) length may be required if the data
logger and SDM-CD16AC are housed at opposite ends of an EN16/18
enclosure.
CRBasic data loggers should use the SDMSpeed() instruction if the cable
length is longer than 6 m (20 ft).
SDM cables in noisy environments need to be suitably shielded.
4.1 Wiring
4.1.1 SDM-CD16AC Power and Control Connections
Refer to FIGURE 3-1 and TABLE 4-1 for SDM-CD16AC operating power and
control connections to the data logger.
TABLE 4-1. Data Logger to SDM-CD16AC Connections
(see caution)
Connection
Order SDM-CD16AC
Data Logger
(see notes) Function
First 12V 12 V on data logger or Power
External supply
Second
G
Gnd Common ground
C1
SDM-C1
(CR3000,
CR5000) or C1 (other
data loggers)
Data
C2
SDM-C2 (CR3000,
CR5000) or C2 (other
data loggers)
Clock
C3
SDM-C3 (CR3000,
CR5000) or C3 (other
data loggers)
Enable
The order in which connections are made is critical. Always
connect 12 V first, followed by ground, then Control Ports.
The CR6 allows SDM operation through control ports C1 , C2 , and
C3 as shown in TABLE 4-1 . In addition, the U terminals on the
CR6 may be used in the same manner. U1 – U3 , U5 – U8 , and U9 –
U11 are usable in the same Data , Clock , Enable order as the C
terminals.
NOTE
CAUTION
NOTE