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SDM-SW8A Switch Closure Input Module
4. Connections
All connections to the datalogger, power supply, and other SW8As are made
from terminals located under "TO DATALOGGER" on the SW8A (refer to
Figure 1). Sensor connections are made at the remaining terminals.
4.1 Connections to Dataloggers and Other SW8As
Connections between an SW8A and the CR10 and 21X dataloggers are shown
in Table 1. Connections to multiple SW8As are shown in Table 2.
1. The order in which connections are made is critical.
ALWAYS CONNECT GROUND FIRST, followed by 12 V
and then the Control Ports.
CAUTION
2. The sum of all the cable lengths connecting SW8As or
other SDM devices and a datalogger should not exceed 20
feet. Lengths in excess of 20 feet may prevent
communication.
4.2 Sensor Connections
Figure 2 shows the connections between the SW8A and compatible sensor
types.
5. Internal Jumpers
Inside the SW8A, jumpers must be set to configure the Module address and the
channel measurement type for each channel. Remove the two panel screws
and lift the cover to access the jumpers. Figure 2 shows jumper location.
5.1 Address Jumpers
Each module can have 1 of 16 addresses (00 to 33, Base 4). The address is
factory set to 00. Figure 2 shows the location of the address jumper block.
Table 3 lists the jumper settings for each address.
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