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the BIOS in personal computers.

rotameter -for measuring flow rate with a plug inside a tapered tube.

router -as network packets travel through a network, a router will direct them towards their destinations

using algorithms.

RPC (Remote Procedure Call) -a connection to a specific port on a remote computer will request that a specific program be run. Typical examples are ping, mail, etc.

RS-232C -a serial communication standard for low speed voltage based signals, this is very common on most computers. But, it has a low noise immunity that suggests other standards in harsh environments.

RS-422 -a current loop based serial communication protocol that tends to perform well in noisy

environments.

RS-485 -uses two current loops for serial communications.

RTC (Real-Time Clock) -A clock that can be used to generate interrupts to keep a computer process or

operating system running at regular intervals.

RTD (Resistance Temperature Detector) -as temperature is changed the resistance of many materials will also change. We can measure the resistance to determine the temperature.

RTS (Request To Send) -A data handshaking line that is used to indicate when a signal is ready for

transmission, and clearance is requested.

rung -one level of logic in a ladder logic program or ladder diagram.

R/W (Read/Write) -A digital line that is used to indicate if data on a bus is to be written to, or read from

memory.

35.19 S

safety margin -a factor of safety between calculated maximums and rated maximums.

SCADA (Supervisory Control And Data Acquisition) -computer remote monitoring and control of processes.

scan-time -the time required for a PLC to perform one pass of the ladder logic.

schematic -an abstract drawing showing components in a design as simple figures.

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