12-1
PC-500 user’s manual
LED signaling and “beep” codes
Chapter 12:
LED signaling and “beep” codes
≡
Description
The PC-500 has a bicolor LED that is used by the BIOS to signal sys-
tem status.
Immediately after the PC-500 powers on, both LEDs are lit and display
an amber color. Upon completion of the boot sequence, the amber LED
turns off and the green LED remains on.
If a failure occurs during the boot sequence, visual beep codes are dis-
played to the LEDs. The visual beep codes are defined in the following
table. Also, if a speaker is installed at J4, the beep codes are audible.
The bicolor LED also indicates memory suspend status. Upon entering
memory suspension, the green LED turns off and the amber LED turns
on. On a resume condition, the amber LED turns off and the green LED
turns on.
When the system enters the cool down clocking state, the green LED
and the amber LED turn on. When the system exits the cool down
clocking state, the amber LED turns off and the green LED
remains on.
Table 12-1
Ethernet LEDs
Color/Pins
CR7
CR8
Amber [1-2]
Board select LED:
Activated by access to I/O
space
Receive LED:
Activated by received data
Green [3-4]
Link LED:
Activated by network link
Transmit LED:
Activated by transmitted
data
Summary of Contents for PC-500
Page 7: ...Notice to user PC 500 user s manual ...
Page 17: ...xii Contents PC 500 user s manual ...
Page 23: ...About this manual PC 500 user s manual ...
Page 25: ...Overview of Section 1 PC 500 user s manual ...
Page 35: ...2 2 Quick start PC 500 user s manual Figure 2 1 PC 500componentdiagram ...
Page 36: ...2 3 PC 500 user s manual Quick start Figure 2 2 PC 500center to centerholedimensions ...
Page 53: ...3 10 SETUP programs PC 500 user s manual ...
Page 57: ...4 4 Save and run programs PC 500 user s manual ...
Page 59: ...Overview of Section 2 PC 500 user s manual ...
Page 71: ...5 12 Serial ports PC 500 user s manual ...
Page 75: ...6 4 LPT1 parallel port PC 500 user s manual ...
Page 81: ...7 6 Console devices PC 500 user s manual ...
Page 89: ...10 2 IRQ routing and opto IRQs PC 500 user s manual Figure 10 1 Interruptroutingmatrix ...
Page 103: ...11 12 EZ I O PC 500 user s manual ...
Page 117: ...14 2 PC 104 expansion PC 500 user s manual ...
Page 119: ...15 2 SCSI PC 500 user s manual ...
Page 121: ...16 2 Ethernet PC 500 user s manual ...
Page 123: ...Overview of Section 3 PC 500 user s manual ...
Page 127: ...17 4 Watchdog timer and hardware reset PC 500 user s manual ...
Page 143: ...19 8 Transferring files remote disks PC 500 user s manual ...
Page 173: ...22 22 CPU power management PC 500 user s manual ...
Page 177: ...23 4 Troubleshooting PC 500 user s manual ...
Page 179: ...Overview of Section 4 PC 500 user s manual ...
Page 225: ...B 28 Software utilities PC 500 user s manual ...