
Pluto User Manual A4
www.diamondsystems.com
Page
31
4.20 COM1-COM4 RS-232 (COMA, COMB)
Connectors COMA and COMB each provide
access to two of Pluto’s four RS-232 compatible serial ports. COM1
and COM2 are on COMA, while COM3 and COM4 are on COMB. Both connectors have identical pinouts.
COM1, COM3, and COM4 only support RS-232 signaling, whereas COM2 supports RS-232, RS-422, and RS-
485, under the control of a jumper option at JRS2. When configured for either RS-422 or RS-485, COM2
’s serial
interface becomes available at connector JCOM1 (described later).
DCD#1/3
1
2
RXD1/3
TXD1/3
3
4
DTR#1/3
GND
5
6
DSR#1/3
RTS#1/3
7
8
CTS#1 / 3
RI#1 / 3
9
10
N/C
DCD#2/ 4
11
12
RXD2/ 4
TXD2/ 4
13
14
DTR#2/ 4
GND
15
16
DSR#2/ 4
RTS#2/ 4
17
18
CTS#2/ 4
RI#2/ 4
19
20
N/C
4.21 VGA Video Out (VGA1)
Connector VGA
1 provides the ETX CPU module’s analog VGA video output signal, for driving a VGA-compatible
CRT or LCD monitor.
Note:
The signals on this connector’s pins are defined by the attached ETX CPU module. Please
refer to the particular ETX module’s user manual for further details on the definition and utilization
of these signals.
RED
1
2
GREEN
BLUE
3
4
(unused)
GROUND
5
6
GND
GROUND
7
8
GND
(unused)
9
10
GND
(unused)
11
12
VDDAT
HSYNC
13
14
VSYNC
VDCLK
15
16
(unused)