GE VME DLAN, Руководство пользователя

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VME DLAN/DLAN+ Interface Module User’s Manual - August 1995
GFK-1044A
MODULE OK LED
The MODULE OK LED indicates the current status of the DLAN Interface module. It has
three states:
Table 1-1. MODULE OK LED Status
State Description
Off When the MODULE OK LED is off, the DLAN Interface module is not functioning. This is
the result of a hardware malfunction; for example, the diagnostic checks
detected a failure. Corrective action is required in order to get the module
functioning again.
On When the LED is on steadily, the DLAN Interface module is functioning properly. Normally,
this LED should always be on, indicating that both the diagnostic tests
and the initialization by the VME CPU were successfully completed.
Flashing The LED flashes rapidly during power-up diagnostics and then more slowly while it waits for
initialization by the CPU.
Note
The DLAN Interface module has a hardware watchdog timer that is periodically
reset by the module software. If the watchdog timer expires, the module stops
functioning and the MODULE OK LED turns off.
COMMAND OUT LED
The center LED indicator, referred to as COMMAND OUT on the module door label, has two
functions. It flashes on briefly during the self test that occurs when the VME rack is powered
on or the module Restart pushbutton is pressed. During normal operation, it flashes whenever a
command from the CPU application program is sent to a network drop.
DATA IN LED
The lower LED indicator, referred to as DATA IN on the module door label, flashes whenever a
page data update message is received from one of the network drops. Most frequently, these
messages contain feedback data. If none of the drops broadcasts an update message, this LED
will flash every two seconds as long as any active drops are connected to the network.
Address Select Jumpers
The address select jumpers, JP1 through JP4, are used to select the VME base address that the
VME DLAN module will respond to in VME short non-privileged mode. See chapter 2, section
1 of this manual for details.
Restart Pushbutton
Pressing the Restart pushbutton for any length of time will halt DLAN communication and
cause the module to perform its internal tests. The CPU application program must detect this
condition and send new DLAN configuration data in order for communication to restart
automatically.