RPI30 parallel interface
Brand: Renishaw | Category: Nanotechnology
The RPI30 accepts differential analogue 1 Vpp sine and cosine signals, interpolates by 4096 and provides an output in parallel format with up to 36 bits of position data. Used with a double pass plane mirror interferometer system, whose sinusoid fundamental period is nominally 158 nm, this yields a least significant bit of 38.6 picometres at velocities up to 2 m/s. Active lissajous correction can be enabled to compensate for DC offset and AC mismatch coming from the laser encoder, improving the sub divisional error to ±0.1 nm at low velocities. Two axis position and status are carried over an LVTTL (3.0 V) compatible bus, and a diagnostics connection allows remote download and analysis.
Selected manufacturer specifications
| Parameter | Value |
|---|---|
| Analogue input | Differential 1 Vpp sine/cosine |
| Interpolation factor | 4,096 |
| Position output | 36-bit parallel word |
| Parallel bus voltage | 3.0 V, 3.3 V tolerant |
| Maximum bus output rate | 5 MHz |
Selected Renishaw manufacturer data. Confirm the exact hardware revision and configured optics, controller and software. Example spectra and sample experiments are not universal instrument specifications. Checked 2026-09-29.
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