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Serial I/O
VL-EPU-3311 Reference Manual
40
Serial Port Connector Pinout
Table 9: COM1/COM2 Connector Pinout
Pin
RS-232 Signal
RS-422/RS-485 Signal
Port
1
RTS1
TXD1_P
COM1
2
TXD1#
TXD1_N
3
CTS1
RXD1_P
4
RXD1#
RXD1_N
5
GND
GND
—
6
RTS2
TXD2_P
COM2
7
TXD2#
TXD2_N
8
CTS2
RXD2_P
9
RXD2#
RXD2_N
10
GND
GND
—
Cabling
An adapter cable, part number CBR-1014, is available for routing the serial I/O signals to 9-pin
D-sub connectors. This is a 12-inch, Pico-Clasp 10-pin to two 9-pin D-sub connector cable.
If your application requires a custom cable, the following information will be useful:
EPU-3311 Board Connector
Mating Connector
Molex 501331-1007
Molex 501330-1000
COM Port Configuration
The board’s jumper block configures the serial ports for RS-232 or RS-485/RS-422 operation.
See the section titled “Jumper Blocks” on page 18 for details. The termination resistor should
only be enabled for RS-485 or RS-422 endpoint stations and not for intermediate stations.
Termination must not be used for RS-232.
Console Redirection
The Osprey can be configured for remote access by redirecting the console to a serial
communications port. The BIOS Setup utility and some operating systems (such as MS-DOS)
can use this console for user interaction. The default settings for the redirected console are as
follows:
115,200 baud rate
8 data bits, no parity
1 stop bit)
No parity
No flow control