Campbell CR800 Series, Operator'S Manual

Page: 505 / 598

Section 11. Glossary
505
Term: Modbus
Communication protocol published by Modicon in 1979 for use in
programmable logic controllers (PLCs). See section Modbus — Overview
(p.
78).
Term: modem/terminal
Any device that has the following:
o Ability to raise the CR800 ring line or be used with an optically
isolated interface (see the appendix CHardwire, Single-Connection
Comms Devices — List
(p. 569)
to raise the ring line and put the
CR800 in the comms command state.
o Asynchronous serial communication port that can be configured to
communicate with the CR800.
Term: modulo divide
A math operation. Result equals the remainder after a division.
Term: MSB
M ost s ignificant b it (the leading bit). See Endianness
(p. 559).
Term: multi-meter
An inexpensive and readily available device useful in troubleshooting data
acquisition system faults.
Term: multiplier
A term, often a parameter in a CRBasic measurement instruction, that
designates the slope (aka, scaling factor or gain) in a linear function. For
example, when converting °C to °F, the equation is °F = °C*1.8 + 32. The
factor 1.8 is the multiplier. See
offset
(p. 506).
Term: mV
The SI abbreviation for millivolts.