190-01115-01
G3X/G3X Touch Installation Manual - LRU Pinouts
Rev. AC
Page 25-25
25.4.8
Serial Data
25.4.8.1
RS-232
5 Channels of RS-232 I/O data.
25.4.8.2
CAN Bus
This data bus conforms to the BOSCH standard for Controller Area Network 2.0-B. This bus complies
with ISO 11898. CAN BUS TERMINATION should be connected to CAN BUS LO for the GDU that is
located at the end of the bus (farthest from the GSU 73), see
for details.
25.4.9
Lighting
The GDU 4XX display and keys can be configured to track 28 VDC or 14 VDC lighting busses using these
inputs. These inputs are reference voltage inputs (not power inputs) with a high impedance of
~100 k
Ω
for pin 43 and ~200 k
Ω
for pin 26. This backlight level reference signal may be supplied with
something as simple as a 10K potentiometer connected to power and ground (drawing 1 mA @ 14 VDC).
The center tap on this potentiometer is connected to one of the pins (43 or 26) in the following table. For
providing this reference signal to more than one device, a commercially available regulated backlight
voltage reference is recommended.
Pin Name
Connector
Pin
I/O
RS-232 IN 1
P4X02
47
In
RS-232 OUT 1
P4X02
48
Out
RS-232 IN 2
P4X02
14
In
RS-232 OUT 2
P4X02
30
Out
RS-232 IN 3
P4X02
29
In
RS-232 OUT 3
P4X02
13
Out
RS-232 IN 4
P4X02
23
In
RS-232 OUT 4
P4X02
40
Out
RS-232 IN 5
P4X02
24
In
RS-232 OUT 5
PX02
41
Out
Pin Name
Connector
Pin
I/O
CAN BUS HI
PX02
46
I/O
CAN BUS LO
P4X02
45
I/O
CAN BUS TERMINATION
P4X02
28
--
Pin Name
Connector
Pin
I/O
14V LIGHTING BUS HI
P4X02
43
In
28V LIGHTING BUS HI
P4X02
26
In