Radial load, max. Maximum loading of shaft encoder shaft in radial direction.
RAM "Random Access Memory" chip; this memory can be read from, written to, and erased freely. When the power goes off, it loses its information.
Range mode See operating mode
Range signal See operating mode
Reference mark Irregular gradation pattern that generates a single signal peak, to provide an absolute reference for an incremental shaft encoder.
Reference pulse Square-wave signal generated by a reference mark, usually only one increment wide, to provide an absolute reference for an incremental shaft encoder.
Repeatability Degree of deviation for a point approached repeatedly under identical operating conditions.
RES Reset; see reset
Reset Resetting of a counter to its initial value
Reset modes - manual reset by pressing the reset key
- electrical reset triggered by signal at reset input
- automatic reset in preset counters after main preset value has been reached
- interruption and re-activation of power supply (power-up reset)
Reset operation See operating mode
Resolution Number of increments per revolution (rotary) or distance between two increments (linear)
Resolver Inductive angular measuring device that generates two alternating voltages, with amplitude a function of the angle.
Reversal error Deviation in reading of a position when approached from different directions (hysteresis).
ROM "Read-Only-Memory" chip, whose memory can only be read out.
Rotational speed [n] Specification of revolutions per unit of time (1/min, 1/h or 1/sec)
RS 422 Standardized interface for unidirectional point-to-point connections (for description refer to "Complementary"); voltage difference 7 V DC max.
RS 422/485 Interfaces for serial data transfer with specifications to EIA standards.
RS 485 Like RS 422, however as a bidirectional bus interface
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