Epson ETX-945 - Manual (Page 19)

ETX-945 User Manual 1.02 www.diamondsystems.com Page 19
4.1.4 Miscellaneous functions
These pins carry power and ground signals and an interrupt request as indicated.
Signal Name Signal Function Direction
VCC +5V ±5% DC power input In
GND Power ground n/a
3V +3.3V ± 5% supply generated on the ETX module, for
powering external devices (500mA max. external load) Out
RESERVED Do not connect n/a
SERIRQ Serial interrupt request In
Caution: Do not connect the 3V pins (pins 12 and 16) of EXT1 to an external power source!