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Application Example
Relay Selection
Figure 2-5. Write a "1" or "0" to the Register Bit to Close/Open the Relay
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This section contains a simplified example application using the breadboard
module as an 8-channel Form-C Relay module. See Figure 2-6. You must
supply the relay driver IC, flyback protection, etc. These have been omitted
from the drawing for simplification.
The I/O Register is used as the interface. To open one specific relay, you
need to WRITE a "0" to the bit of the I/O Register which corresponds to that
relay. To close a channel, you need to write a "1" to the corresponding I/O
Register bit.
NO
COM
NC
NO
COM
NC
The status of all relays must be specified simultaneously. To change just one
relay, it is necessary to change the corresponding bit and send the entire
pattern again.
Relay position
after "CLOSE" command
Relay position
after "OPEN" command
Using the Breadboard
29
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