ePAQ-9405
User’s Guide
UG-1084
8
LED Indications
Copyright © 2017 QEI
6.5 Logic Pwr and Heartbeat LEDs
A dual LED array indicates logic power PWR (upper LED) and CPU activity, or
heartbeat HBT (lower LED):
LED Name
Function
PWR
Upper LED indicates CPU logic power is active when lit.
HBT
Lower LED. This LED flashes on and off at a one second rate
(approx.) when the CPU is active and functional.
6.6 Comm Port LEDs
Four dual LED arrays indicate activity on the communications serial ports (TX/RX
data) and Ethernet ports (High Speed, Link/Network Activity):
L/A
HS
R
T
R
T
RS-232
(J4)
Tx
Rx
Tx
Rx
(J5)
(J6)
10/100
(J7)
ETHERNET
PORT 5
COMM.
PORT 3
PORT 2
PORT 4
R
T
RS-485
LED Name
T
R
Dual LED arrays indicate TX and RX data for communications ports
2, 3, and 4. The arrays are located to the left of each port. The upper
LED of each array indicates data transmitted out from the port. The
lower LED indicates data received by the port.
HS
High Speed (upper LED). This LED indicates when the Ethernet port
is communicating at 100 Mbps (LED on) or 10 Mbps (LED off).
L/A
Link/Activity (lower LED). This LED indicates activity on the ethernet
CAT5 or Fiber cable connected to ethernet port 5. LED on indicates
activity present.
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