Campbell CR850 - Page 436

Section 11. Glossary
436
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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.