CHAPTER 4: MAINTENANCE AND TROUBLESHOOTING
SNAP PAC Brains User’s Guide
27
27
•
Make sure the brain’s hold-down screw has been tightened so that it is firmly attached to the
rack. (Do not overtighten.)
•
Verify that you typed in the correct address for the brain. Check the label on the side of the
brain, where the IP address should be written.
•
Make sure the brain has been assigned a valid IP address and subnet mask. SNAP PAC brains
come from the factory with a default IP address of 0.0.0.0, which is invalid. The default subnet
mask is 255.255.255.0. To assign an IP address and subnet mask, see the
PAC Manager User’s
Guide
.
•
Make sure that no red LEDs on the brain are lit. A red LED could indicate a voltage supply
problem. Each brain
should have its own power supply. The brain needs a minimum of 5.0 VDC,
measured at the rack.
•
Make sure you have up-to-date drivers installed on your computer’s Network Interface Card
(NIC). Contact your system administrator or the manufacturer of the card for help.
•
Make sure you have Administrator privileges on your computer and that any firewall in the
computer (such as the built-in firewall in Windows XP) is temporarily disabled before you try to
assign or change IP addresses, load firmware using PAC Manager’s Maintenance window, or
work with files on the brain. BootP and FTP cannot function through a firewall in the PC.
Firewalls in a router are less likely to be a problem.
Pinging the Brain
If you still cannot communicate with the brain after you have checked these items, try to reach it
using the PING protocol.
1.
Choose Start
➞
Programs
➞
Accessories and open a command prompt window.
2.
At the prompt, type:
ping [brain’s IP address]
For example, type:
ping 10.192.54.40
If the brain responds,
go to
“Accessing the Brain with PAC Manager” on page 28
If the PING command cannot be found
, choose Start
➞
Control Panel
➞
Network. Make sure
TCP/IP is configured as a protocol and that an IP address and subnet mask are assigned.
If you see the message “Destination host route not defined,”
the brain probably has an
inappropriate IP address and subnet mask. Make sure the IP address and subnet mask on the brain
are compatible with those on the computer. Follow the directions beginning on
to check
the IP address and subnet mask on the brain, and change them if necessary.
If you see the message “No response from host,”
check the following:
•
Are the computer and brain correctly connected? Is the brain turned on?
•
Are the IP address and subnet mask on the brain compatible with those on the computer?
•
Is the brain in reset mode? (Check for a blinking STAT LED. STAT blink codes are shown on
.)
If you still cannot ping the brain,
contact Opto 22 Product Support. (See
.)
