CR300-Series Datalogger
35
•
Modbus
•
DNP3
•
Campbell Scientific PakBus networks
6.5.1.1 USB Port
One micro-B USB port, labeled
USB
, for communicating with a PC through
datalogger support software. Powering through the
USB
port has the limitations
(p. 39)
.
6.5.1.2 RS-232 Port
One nine-pin DCE port, labeled
RS-232
, normally used to communicate with a
PC running datalogger support software, to connect a modem read a smart
(p. 35)
). With a null
modem adapter attached, it serves as a DTE device.
6.5.1.3 SDI-12 Ports
SDI-12 is a 1200-baud protocol that supports many smart sensors (see Section
).
C1
and
C2
can each be configured as an
SDI-12 communication port.
6.5.2 General Serial Communications
The CR300 supports two-way serial communication through two ports
configurable for RS-232 input. In addition to the nine-pin
RS-232
port,
terminals
C1
and
C2
can be configured as a pair to create an RS-232
communication port, called
Com1
. Ports can be formatted as described in
CRBasic Editor Help
.
These two ports can be used with smart sensors that deliver measurement data
through serial data protocols or with devices such as modems that
communicate using serial data protocols.
CRBasic instructions for general serial communications include:
•
SerialOpen()
•
SerialClose()
•
SerialIn()
•
SerialInRecord()
•
SerialInBlock()
•
SerialOut()
•
SerialOutBlock()
To communicate over a serial port, it is important to be familiar with the
protocol of the sensor or device. Refer to the manual of the sensor or device to
find its protocol and then select the appropriate options for each CRBasic
parameter. See the application note
Interfacing Serial Sensors with Campbell
, available at
, for more
programming details and examples.
6.5.3 SDI-12 Communications
SDI-12 is a smart-sensor protocol that uses one terminal configured for SDI-
12. Terminals
C1
and
C2
can each be configured as an SDI-12 communication
terminal.
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