User`s guide

ADC data obtained from the SS420 circuitry and passes that
data back to the PC via the serial interface.
SS420 Circuitry – The SS420x circuitry provides an Intel 8752
micro-controller with 4 associated ADC’s.
Battery – The battery provides backup power to the SRAM.
SRAM – The SRAM (Static RAM) provides 1 MB of memory for
the 80C188EB CPU (which is used for long-term storage of the
ADC samples).
SEEPROM – The SEEPROM (Serial EEPROM) provides 512 by
16 bits of memory of non-volatile storage, which is used, for
version, calibration and baud rate data.
FLASH – The 256 KB Flash memory provides non-volatile
storage for the 80C188EB firmware.
LED Indicators – The red LED provides the SS420x power
status. The four green LED’s provides feedback about the
SS420x power-up status, error conditions, and data collection
cycles.
Analog Inputs – The 4 analog inputs provide input into the
SS420 circuitry, which the Analog to Digital converter’s (ADC)
convert into 24-bit digital data for each of the four channels.
The 8752 micro-controller reads the ADC data and stores that
data in a 32-byte queue.
Trigger Inputs – The 4 trigger lines provide start inputs to
trigger analog data collection.
Contact Closures – The 8 contact closures provide the
capability of controlling external devices.
Serial Input – The serial input provides an RS-232C interface
to any controlling computer at various baud rates. The
SS420x has an additional RS-232C interface port that is
currently not used.
SS420x User’s Guide 7