Schiller AT-102 Service Handbook page 133

AT-102 Service Handbook
UWE Upper write enable.
+U Unregulated dc supply from mains (approximately 30V).
+UBU Back-up voltage for the real time clock and static RAM.
+UD Unswitched regulated dc voltage used as power source for the switched
supply +US. The voltage is 13.5 V when mains is connected, or battery
voltage when mains is not connected. When mains is connected, this supply
charges the battery.
-ULCD Contrast voltage to LCD.
+US Input voltage for all PSUs on the power supply board from the rectified mains
or from the battery.
VCC +5 V
VMA Valid memory address.
VPA Valid peripheral address.
VSYNC Vertical synchronisation - (video / VGA output).
WP0 and WP1 ECG in - the serial multiplexed ECG serial data to the CPU sent over the
optical interface, from the ECG amplifier.
XD0..XD3 Pixel information.
XSCL Shift clock for XDn.
YD Frame synchronisation.
YDIS/ LCD off.
ZEROSET Baseline reset (on the ECG amplifier) from the processor.
Article Number 2. 540 028
SCHILLER AG 2002
Annex A
Glossary
Annex
A.7