SCHILLER AT-2plus 6-Channel ECG Unit
SERVICE HANDBOOK Issue d May 2002
Page 8.3
Chapter 8
Glossary
Acronyms
..OS
Offset signal (on the ECG amplifier).
A(1...n)
CPU Address Bus
ALBEEP
Alarm beeper signal to the audio amplifier. The frequency of this
signal is about 1000 Hz.
ANA1, ANA2
Analog input from the experimental inputs DC1 and DC2
AS
Address strobe
BATT
Signal to CPU indicating battery operation
BATTLC
Analog signal to the processor giving the charge condition of the
battery.
BATTV
Battery voltage - analog signal from the power supply used by the
processor to assess battery or mains operation.
BLOW
Battery less than 11.3 V. LCD flashes when this signal is acrive.
When the battery drops to below approximately 9.4 V the unit is
switched off. These values apply to equipment with 12 V battery. For
other equipment the limits are different.
CHAD..
ECG signal multiplexer control signals (on the ECG amplifier).
CIF(0..16)
Communication interface. General control signals for the
communications interface circuits.
CI(0..10)
RS interface control lines - input.
CO(0..10)
RS interface control lines - output.
CL1
19 kHz LCD latch pulse.
CL2
3.11 MHz LCD clock frequency.
CLK..
Clock signal. The number following the CLK indicates the frequency.
For example CLK19 indicates a frequency of 19 MHz.
CS..
Chip select. The general format of the chip select signals is CS
followed by some characters. The characters indicate the device to
which the chip select signal appertains. For example CSRTC is the
chip select signal for the real time clock and CSEPROM is the select
signal for the EPROM etc.
CTS
Clear to send. General signal used in data communication.
D(0..15)
Data bus.
DACWR
Digital / analog converter write.
DMUX
Data multiplexer.
DRAM
Dynamic RAM.
DRC(0..6)
Dynamic RAM control.
DS..
Data strobe.
DSP..
Digital signal processor (on program pack).
