Campbell Scientific CR1000 Measurement and Control System - Manual (Page 203)

Section 7. Installation
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Note If an instrument or sensor optionally supports SDI-12, Modbus, or DNP3,
consider using these protocols before programming a custom protocol. These
higher-level protocols are standardized among many manufacturers and are easy
to use, relative to a custom protocol. SDI-12, Modbus, and DNP3 also support
addressing systems that allow multiplexing of several sensors on a single
communications port, which makes for more efficient use of resources.
7.8.8.4 Glossary of Terms
Asynchronous
Indicates the sending and receiving devices are not synchronized using a
clock signal.
Baud rate
The rate at which data are transmitted.
Big Endian
"Big end first." Placing the most significant integer at the beginning of a
numeric word, reading left to right.
cr
Carriage return
Data bits
Number of bits used to describe the data, and fit between the start and
stop bits. Sensors typically use 7 or 8 data bits.
Duplex
Can be half or full. Full‐duplex is simultaneous, bidirectional data.
lf
Line feed
Little Endian
"Little end first." Placing the most significant integer at the end of a
numeric word, reading left to right.
LSB
Least significant bit (the trailing bit)