Moog 903 User Manual page 113

903-0623-00 Rev. A
LED
STAT (Status) LED is green when on-board diagnostic readings are within tolerance. The
STAT LED is orange (warning) if any of the on-board diagnostic readings are close to an
alarm state. The STAT LED is red (alarm) if any of the on-board diagnostic readings are
outside of the specified range, in which case the diagnostic software should be used to
STAT troubleshoot the problem. Monitored signals included temperature and all major voltage
rails (+12V, -12V, +5V, and +3.3V). An alarm state exists if any voltage is worse than
±20% of nominal value or temperature is > +80C. A warning state exists if any voltage is
worse than ±10% of nominal value or temperature is > +75C, but the reading is not in an
alarm state.
F1/F2 LEDS indicate which fiber is active, per the marked ST bushings. The active fiber is
F1/F2
shown by the green LED.
AUTO LED is green when the fiber switch is in automatic mode, as determined by the
AUTO
toggle switch position.
Diagnostics are available at the 3.5 mm (1/8") stereo jack in RS-232 format compatible with the standard
Model 903 Diagnostics Software. Wiring for the RS-232 connections is shown in the Table below, where
TXD/RXD are relative to the connected PC.
The fiber switch may be placed in automatic mode or forced to fiber F1 or F2 using the front panel toggle
switch. In automatic mode, the GLINK FMB-X tests both fibers on initial power up and chooses the one
with the highest optical power. This will stay locked until the switch is forced to the other fiber, via the
toggle switch, or link is lost on the active fiber. The LED by F1 is green when that fiber is active – the
same applies to F2. The LED marked "AUTO" is green when in automatic switching mode.
When the optical link is lost, the switch will toggle automatically at roughly once per second between F1
and F2. This will continue for up to 10 toggles. If no link is found, the switch will return to the original fiber
it was on before the link failure and wait for a link. While no link exists after this hunting period, all of the
fiber switch LEDs are red.
The GLINK FMB-X sounds a continuous audible alarm when an optical link fails, even if the other fiber
has a valid link. This identifies a fiber fault to the operator which otherwise might not be noticed, as the
switchover from one fiber to the other is often seamless. The alarm can be turned off by briefly forcing the
toggle switch to the active fiber in manual mode and then back to the automatic setting.
Table D.2-2: RS-232 Diagnostic Port Connections
Stereo Jack Pin
1 (Tip)
2 (Middle Ring)
3 (Base Ring)
Model 903 User's Guide, FMB-X-2.5 Version
Description
DB-9F pin Function
3
2
5 SIG GND
TXD
RXD