Appendix C
Troubleshooting and Common Questions
ENET-232 and ENET-485 Series User Manual
C-4
ni.com
PWR/RDY LED Continues to Flash after 90 Seconds
If the
PWR/RDY
LED continues to flash rapidly 90 seconds after
power-on, the serial device server cannot obtain its network parameters
from the network using DHCP. In this case, have your network
administrator verify your network parameters.
PWR/RDY LED is Steady Red
Verify that the CFG RESET button is not pressed or stuck. If the LED
remains red, the device encountered an unrecoverable error. Contact
National Instruments.
Ethernet LEDS (LINK, TX, and RX) Are Blinking in Unison
An internal network configuration error has occurred. Contact National
Instruments.
Serial Application Cannot Open Port
•
Confirm that no other users or applications are already using the port.
The port is closed when its associated port LED is off.
•
Verify that the device is not in network configuration mode or in the
process of booting (indicated by the rapid blink of the
PWR/RDY
LED).
•
Verify that the system is properly configured. Run diagnostics as
described in Chapter 5,
Cannot Send/Receive Data or Serial Data is Scrambled
•
Verify that the baud rate, data bits, stop bits, and parity settings are
correct for both the serial device server and the target device.
•
Confirm you are using the correct serial cable type (null modem or
straight-through; RS-232 or RS-485).
•
If you are using an ENET-485, confirm that you are using the
proper wire mode and bus configuration. Refer to the
Transceiver Modes on the ENET-485
section in Chapter 6,
, for more information on the ENET-485 wire
modes.
