
Pluto User Manual A4
www.diamondsystems.com
Page
25
4.10 Infrared Interface (IR1)
Connector IR1 provides a bidirectional serial data interface for use with an external infrared transceiver.
1
+5V
2
(unused)
3
Receive Data
4
GND
5
Transmit Data
4.11 LCD Inverter Interface (INV1)
Connector INV1 pr12V and backlight control signals for use with an external LCD panel. The +12V power
supplied to this connector passes through
from the Pluto Baseboard’s DC Power input connector (PWR1).
The backlight power on/off pin is controlled by the display controller chip on the attached ETX CPU module,
according to power management control configured via the BIOS Setup and the operating system in use. The
effect of the brightness control signal will vary according to the LCD panel and backlight inverter board being
used.
Note:
The control signals (BLON-
, BIASON) on this connector’s pins are routed from the attached
ETX CPU
module’s ETX3 connector. Please refer to the particular ETX module’s user manual for
further details on the definition and utilization of these signals.
1
+12V
2
GND
3
BLON-
4
BIASON
5
GND
Signal Name
Signal Function
Direction
BLON-
LCD backlight power on/off
Output
BIASON
LCD brightness control
Output
+12V
LCD backlight inverter power
Output
GND
Ground
n/a