Schiller AT-2plus - Page 91

SCHILLER AT-2plus 6-Channel ECG Unit
SERVICE HANDBOOK Issue d May 2002
Page 8.6
Chapter 8
Glossary
Acronyms
SCINV Screen inversion.
SO Serial output from the CPU to the ECG amplifier via opto isolators.
SP.. Spirometry control and data signals.
SRAM Static RAM memory.
STRB1/2 Timing signals for printer control.
SYSEN System enable - active when the Program Pack is inserted. The CPU
will not work if this signal is not active.
TGATE Gate pulse for programmable timer. This signal sets the TPDUR
signal.
TM Thermal printer temperature - dc voltage from the print head, pulse
width modulation of signal TPTH.
TPC Thermal printer clock. This is not a continuous clock signal but is
active when loading a line of printer data (into shift registers).
TPCLK Thermal printer clock.
TPD Thermal printer data - serial data for the printer.
TPDUR Thermal printer duration - duration of the strobe pulse dependant on
the ambient temperature of the print head and the resistance of the
print head.
TPCSEL Thermal printer controller select - control of thermal printer FIFO
(input memory buffer).
TPL Thermal printer latch - print strobe control and data latch signal.
TPRES Thermal printer reset - FIFO reset for thermal printer controller.
TPS 0 & 1 Thermal printer strobe.
TPTH Thermal printer temperature - dc voltage from the print head to ADC,
approximately 3.7 V at room temperature.
TS Temperature sense (from battery).
TXD Outgoing serial data.
uPOFF Off control signal. Logic 1 keeps the unit switched on, logic 0
switches the unit off. Note that the unit is initially switched on directly
from the ON key on the keyboard.
U1,2,3,4 Upper LCD data.
+UB Battery voltage.
UCAS Upper column address strobe (for dynamic RAM).
UD1, UD2 Upper data strobe - used for generating UOE and UWE.
UDS Upper data strobe - used on the Schiller gate array.
UOE, USRAM Upper output enable - for static RAM.