Campbell Scientific CR800 and CR850 Measurement and Control Systems - Manual (Page 436)

Section 11. Glossary
436
Modbus
Communication protocol published by Modicon in 1979 for use in
programmable logic controllers (PLCs).
modem/terminal
Any device which:
o has the ability to raise the CR800 ring line or be used with an optically
isolated interface (see the appendix CS I/O Serial Interfaces
(p. 545)
) to
raise the ring line and put the CR800 in the telecommunications
command state.
o has an asynchronous serial communication port which can be configured
to communicate with the CR800.
Glossary. modulo divide
A mathematical operation wherein the result of interest is the
remainder after a division.
MSB
Most significant bit (the leading bit).
multi‐meter
An inexpensive and readily available device useful in troubleshooting
data‐acquisition system faults.
multipler
a term, often a parameter in a CRBasic measurement instruction, to
designate the slope, 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.
mV
The SI abbreviation for milliVolts.
NAN
Not a number. A data word indicating a measurement or processing
error. Voltage over‐range, SDI‐12 sensor error, and undefined
mathematical results can produce NAN.