The date, time, PM, clock mode, reset, serial number, and total machine
cycles can be set using the Edit mode.
Controller Operation
The machine functions are based on analog signals from transducers
and digital signals from sensors and front panel controls. The control
subsystem processes the input, controls the process through digital
output, and sends messages to front panel, displays, indicators, and to
the printer.
Parameter
Description
Size
305 mm W x 355 mm H x 215 mm D
EMI Shielding
Exceeds CISPR and VDE 871 Class A standards
Safety
Exceeds IEC 601-1 and UL standards
Cooling
25 CFM whisper fan
Microprocessor Board
The microprocessor board (CPU) is based on Zilog’s Z80A 8 bit
microprocessor clocked at 4.0 MHz. There are a total of 64 Kbytes of
memory organized as 56 Kbytes of EPROM and 6 Kbytes of lithium
battery backed SRAM. The word sizes are 8 bits for the data bus and 16
bits for the address bus.
The control computer consists of discrete, purchased boards for the
CPU/digital input, digital output, and analog input functions
communicating via a STD Bus. The CPU board includes 16 TTL
compatible digital input ports with integral pull up resistors, two RS-232
serial interfaces, and four counter timer clocks.
The CPU for Block 2 devices is a 64180 standard bus microprocessor
with a full Z80 instruction set. It is clocked at 6.0 MHz and has
off-board memory expansion capabilities and a watch-dog timer. There
are a total of 512 Kbytes of memory organized as 128 Kbytes of EPROM
and 128 Kbytes of lithium battery backed SRAM.
The board contains: a two channel DMA controller, a 2 channel async
serial RS232 controller, a 16 bit programmable timer and a twelve
source interrupt controller. The CPU also has two 8-bit parallel digital
I/O with handshaking capabilities (8420 PIO) and a counter/timer
controller with four additional 8 bit counter/timers (8430 CTC).
Theory of Operation
User Interface and Control Subsystems
ASP Service Guide rev D.
STERRAD® 100 Sterilizer
6-7
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