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.
