Campbell SDM-CVO4, Руководство по эксплуатации продукта

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SDM-CVO4 4-Channel Current/Voltage Output Module
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7.1 Connection to a Data Logger
For data logger connections, see TABLE 7-1 .
TABLE 7-1. Data Logger to SDM-CVO4 Connections
Connection
Order SDM-CVO4 Data Logger Function
First +12 12 V on data logger or
external supply
Power
Second G
⏚ or G
Common
Ground
C1 SDM-C1
(CR3000) or
C1 (other data loggers)
Data
C2 SDM-C2 (CRCR5000) or
C2 (other data loggers)
Clock
C3 SDM-C3 (CRCR5000) or
C3 (other data loggers)
Enable
Multiple SDM-CVO4s may be wired in parallel by connecting the SDM and
power connections from one SDM-CVO4 to the next.
The CR6 allows SDM operation through control terminals C1 ,
C2 , and C3 as shown in TABLE 7-1 . In addition, the U terminals
on the CR6 may be used in the same manner. U1 to U3 , U5 to U8 ,
and U9 to U11 are usable in the same Data , Clock , Enable order
as the C terminals.
If the total cable length connecting SDM-CVO4s to
SDM-CVO4s, other SDMs and the data logger exceeds 6 m, the
SDM baud rate may need to be reduced to ensure reliable
operation. Please contact Campbell Scientific for more
information.
The transient protection of the SDM-CVO4 relies on a low resistance path to
earth. Ensure that the ground return wire has a low resistance. Connect the
SDM-CVO4 directly to the enclosure earth ground terminal.
Make sure the SDM-CVO4 ground wire connects to the data
logger G terminal and not the ⏚ (analog ue ground) terminal.
The SDM-CVO4 uses spring-loaded terminal blocks to provide quick,
vibration resistant, connections. To attach wires, insert a small screwdriver into
either the top or front slot, as appropriate, and push to open the terminal spring.
Strip insulation from the wire to give 7 to 9 mm bare wire. Push the wire into
the opening, and, while holding it in position, withdraw the screwdriver to
release the spring. The wire will now be firmly held in place. See FIGURE 7-1
and FIGURE 7-2 .
NOTE
NOTE
CAUTION