Campbell Scientific CR1000 Measurement and Control System - Manual (Page 40)

Section 4. Quickstart Tutorial
40
channel. Connect the other wire to a pulse channel. Sometimes the sensor will
require power from the CR1000, so there will be two more wires – one of which
is always ground. Connect power ground to a G channel. Do not confuse the
pulse wire with the positive power wire, or damage to the sensor or CR1000 may
result. Some switch-closure sensors may require a pull-up resistor. Consult
figure Connecting Switch Closures to Digital I/O
(p. 318)
for information on use of
pull-up resistors.
Figure 8: Pulse input wiring -- anemometer switch
4.1.3.4 RS-232 Sensors
The CR1000 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. 41),
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.