Schiller AT-102, Service Handbook

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Annex
A.3
Article Number 2. 540 028
SCHILLER AG 2002
AT-102 Service Handbook
Annex A
Glossary
Acronyms
..OS Offset signal (on the ECG amplifier).
A(1...n) CPU Address Bus
ALBEEP(or BEEP) 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 active. 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.