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PARK ENCODER 32S

PARK PCM-32S is an extremely compact PCM encoder capable of handling thirty-two single-ended analog input channels and three RS422 asynchronous serial communication ports. It can encode the analog channel input data and the data received on asynchronous communication channels into a user-defined PCM stream structure. 

The PCM-32S encoder can handle data rates up to 115Kbps on the RS422 serial communication ports and employs a very high-speed (500K samples per second) 12-bit ADC to handle the analog inputs. The unit operates on a single 5V ± 0.25V power supply and dissipates less than one watt of power. It can generate PCM bit streams up to 2Mbits per second.

The PCM frame format, the PCM bit rate, and the commutation schemes required can be downloaded into the configuration flash of the unit from a PC, using the configuration software provided with the unit. Its compact size, rugged construction, field configurability, and low power consumption make it ideally suited for onboard applications.

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PCM Output
  • Bit rate: 100 bps to 2.0 Mbps (Programmable).
  • Data clock: Crystal Oscillator (internal frequency synthesizer).
  • Data encoding: Bi-phase L, NRZ-L (other codes available as options).
  • PCM Output level: ±2.0V peak to peak into 75 ohms.
PCM Frame Configuration
  • Word Length: 8 to 16 bits, programmable.
  • Frame Length: 10 to 4096 words, programmable.
  • Max Sub Frame Length: 64K words, programmable.
  • SFID Method: Up/down, programmable.
  • Max Frame/Sub-frame: 256, programmable.
  • SFID Position: Configurable.
  • Synch Length: 8 to 64 bits, programmable.
  • Parity: Odd, Even, None; programmable.
Signal Inputs
  • Analog: 32 single-ended analog channels.
  • Digital: RS422 digital channels: 03 numbers.
Analog Input Characteristics
  • Input voltage range: Unipolar 0 to +5V.
  • Input capacitance:
    • Track mode: 47pf approx.
    • Hold mode: 10pf approx.
  • ADC Resolution: 12 bits.
  • ADC Conversion Time: 2 microseconds.
  • ADC Linearity: ±1 bit.
  • Missing Codes: None.
Analog Input Commutation

The commutation scheme for each analog input can be defined independently. Options include:

  • Normal commutation: One sample per PCM frame.
  • Super commutation: Several samples per PCM frame.
  • Sub commutation: Less than one sample per PCM frame.

For super commutation, the starting word number and separation between consecutive words can be defined. For sub commutation, the starting frame number and frame interval separating consecutive samples can be defined.

Serial Communication Ports
  • Protocol: Asynchronous serial communication.
  • Electrical Interface: EIA RS422.
  • Word Length: 8 bits.
  • Parity: None.
  • Start Bits: One.
  • Stop Bits: One.
  • Baud Rates Supported: 115.2 Kbps, 57.6 Kbps, 38.4 Kbps, 19.2 Kbps, 9.6 Kbps, 4800 bps.
  • Maximum Single Block: 256 bytes (including ID size pattern).
  • Start of Block ID: 4-byte ID pattern at the beginning of the block.
Serial Communication Port Data Commutation

Each serial communication port is double-buffered with two 256-byte buffers, synchronized with the ID pattern. One buffer fills while the other is multiplexed into the PCM stream. The data can be commutated normally, sub-commutated, or super-commutated, treating each byte as a PCM word.

Each data byte received can be configured as:

  • A single PCM word, with the 8-bit RS422 data placed in the LSB of the PCM word.
  • Two consecutive RS422 words packed into a single PCM word, with the first byte containing the 8 MSB and the second byte the 8 LSB.
  • A full RS422 buffer can be commutated into each PCM frame as a burst.
Programming GUI Software

A PC-based GUI software (compatible with Windows 2000/XP) is provided for configuring the encoder via a PC parallel interface. A programming cable is included for orders of 20+ encoders; otherwise, it must be ordered separately.

Interface Connector
  • 51-pin high-density micro-D receptacle for signal, power, and programming connections.
  • A 51-pin mating micro-D plug with pre-wired 12” Teflon wires is provided.
Power Requirements
  • Voltage: 5.75V ± 0.25V.
  • Current: 200mA maximum.
Operating Environments
Test Qualification Acceptance Remarks
High Temperature +65°C : 8 Hrs +55°C : 8 Hrs PREET POET
Low Temperature -20°C : 8 Hrs -20°C : 8 Hrs PREET POET
Vibration (Sinusoidal, Non-operational) 5-500Hz, 10g, Duration: 30 min each axis - PREET POET
Vibration (Random, Operational) 20-2000Hz; 0.6g²/Hz, Duration: 2 min on 3 axes 20-2000Hz; 0.04g²/Hz, Duration: 1 min on 3 axes PREET POET INSET
Shocks (Non-operational) 500g, 3 ms, 2 shocks per axis 300g, 6 ms, 2 shocks per axis PREET POET
Dimensions

75 x 60 x 25mm (maximum outer dimensions).