
Section 4. Quickstart Tutorial
41
result. Some switch-closure sensors may require a pull-up resistor. Consult
figure Connecting Switch Closures to Digital I/O
(p. 323) for information on use of
pull-up resistors.
Figure 9: Pulse input wiring -- anemometer switch
4.1.3.4 RS-232 Sensors
The CR3000 has 6 ports available for RS-232 input as shown in figure Location
of RS-232 Ports
(p. 41).
Note With the correct adaptor, the CS I/O port can be used as an RS-232 I/O
port.
As indicated in figure Use of RS-232 and Digital I/O when Reading RS-232
Devices
(p. 42), RS-232 sensors can be connected to the RS-232 port or to digital
I/O port pairs. Ports can be set up with various baud rates, parity options, stop-bit
options, and so forth as defined in CRBasic Editor Help.
Figure 10: Location of RS-232 ports
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