toggle
To reverse the current power state.
TTL
Transistor-to-Transistor Logic. A serial protocol using 0 VDC and 5 VDC as logic signal levels.
Tx
Transmit
U
UART
Universal Asynchronous Receiver/Transmitter for asynchronous serial communications.
UINT2
Data type used for efficient storage of totalized pulse counts, port status (status of 16 ports
stored in one variable, for example) or integer values that store binary flags.
unconditioned output
The fundamental output of a sensor, or the output of a sensor before scaling factors are
applied.
UPS
Uninterruptible Power Supply. A UPS can be constructed for most data logger applications
using ac line power, a solar panel, an ac/ac or ac/dc wall adapter, a charge controller, and a
rechargeable battery.
URI
Uniform Resource Identifier
URL
Uniform Resource Locator
Appendix C. Glossary293
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