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Chapter 2 Product Overview
14 Reference Manual LittleBoard 550
Jumper Definitions
Table 2-4 describes the jumpers shown in Figure 2-5.
Table 2-4. Jumper Settings
Jumper # Installed Removed/Installed
JP3 – CompactFlash
Voltage Select
Enable +5V (1-2)
(Default)
Enable +3.3V (1-3)
JP4 – CompactFlash
Master/Slave Select
Enable Master (pins 1-2)
Enable Slave (Removed)
(Default)
JP5 – Serial Port 1 (COM1)
RS485 Termination
Enable Termination (1-2) Disable Termination (Removed)
(Default)
JP6 – Serial Port 2 (COM2)
RS485 Termination
Enable Termination (1-2) Disable Termination (Removed)
(Default)
JP7 – Serial Port 3 (COM3)
RS485 Termination
Enable Termination (1-2) Disable Termination (Removed)
(Default)
JP8 – Serial Port 4 (COM4)
RS485 Termination
Enable Termination (1-2)
Disable Termination (Removed)
(Default)
LED Definitions
Tables 2-5 and 2-6 provide the LED colors and definitions for the Ethernet ports, Port 1 (J7) and Port 2
(J32) located on the LittleBoard 550. Refer to Figure 2-5.
Table 2-5. Ethernet Port 1 (J7) LED Indicators
Indicator Definition
Ethernet
Link/Activity
LED
Link/Activity LED – This yellow LED is the activity/link
indicator and provides the status of Ethernet port 1 (J7).
• A steady On LED indicates a link is established
• A flashing LED indicates active data transfers
Ethernet
Speed LED
Speed LED – This green LED is the Speed indictor and
indicates
transmit or receive speed of Ethernet port 1 (J7).
• A steady Off LED shows the port at 10BaseT speed
• A steady On LED shows the port at 100BaseT speed
Table 2-6. Ethernet Port 2 (J32) LED Indicators
Indicator Definition
Ethernet
Link/Activity
LED
Link/Activity LED – This yellow LED is the activity/link indicator
and provides the status of Ethernet port 2 (J32).
• A steady On LED indicates a link is established
• A flashing LED indicates active data transfers
Ethernet
Speed LED
Speed LED – This green LED is the Speed indictor and indicates
transmit or receive speed of Ethernet port 2 (J32).
• A steady Off LED shows the port at 10BaseT speed
• A steady On LED shows the port at 100BaseT speed