MTS Systems Temposonics II LDT - RS422 Personality Module (RPM)

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Figure 4-6
RS422 Personality Module (RPM)
4.3 RS422 Personality Module (RPM)
The RS422 Personality Module (RPM) is an alternate integrated circuit module. The RPM is also the size of
a US postage stamp and is installed directly into the transducer head to provide the circuitry required to
produce an RS422 start/stop output. This signal is then transmitted to a digital counter card or various
other devices. The RPM must be interrogated by an external source.
The surface mount components of the RPM reduce moment of inertia and enhance shock and vibration
resistance of the module. The simplicity of design makes the module rugged and reliable.
Figure 4-7
The RPM Start/Stop Signal
Waveguide
Driver Board
RS422
Personality
Module
Inside Temposonics LDT Head
Excitation Pulse
(IF externally interrogated)
Return Pulse
1 µs, nominal
Interrogation Pluse
TTL Level
0 V
0 V
RS422
1 µs pulse width
TTL Level
Displacement