
Digital I/O Board
The digital I/O board from the VersaLogic Corporation is designed to
interface directly with the system. It provides 48 I/O lines for control
purposes and features 8 and 10 bit addressing. These lines are
configured as two 24-channel groups connected through two 50 pin I/O
connectors. The digital I/O occupies 8 consecutive I/O addresses and
uses two latching 50 pin headers of the I/O connections.
Each input channel is individually filtered to minimize noise induced
errors at the input buffer. Reading a channel that is currently
programmed as an output, reads the current state of the output line
(output readback). Each output line is latched, fully buffered and is
automatically cleared during system reset.
Analog-to-Digital Converter
The analog-to-digital converter performs 12-bit conversion of any one of
16 selectable analog input channels. Conversion is controlled by the host
microprocessor system via the STD bus, providing channel selection and
free run or convert on demand.
Completion of a conversion cycle signals the processor through use of
interrupts or a status bit. Data consists of 12 data bits, a polarity bit,
over-range bit and status bit organized as two bytes. The base address is
chosen by placement of straps in the address decoding portion of the
card.
The converter includes:
F
12-bit binary A/D converter
F
16 channel analog multiplexer·
F
Straps for user-selectable address decoding
F
Crystal controlled clock·
F
20 pin external header connection for the analog signal input.
F
14 pin external DIP switch for interrupt priority.
F
+5.00 VDC at 0.7 amps
User Interface and Control Subsystems
Theory of Operation
6-8
STERRAD® 100 Sterilizer
ASP Service Guide rev D.
Содержание STERRAD 100
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