Table 3.1-2: Rs-232 Diagnostic Port Connections - Moog 903 User Manual

903-0623-00 Rev. A
LED
STAT (Status) LED is green when on-board diagnostic readings are within expected
values. 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
STAT be used to 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. (Toggle up forces the fiber switch to F1 and toggle down forces
it to F2.) The LED(s) will turn red if no link is present.
AUTO LED is green when the fiber switch is in automatic mode, as determined by the
AUTO
toggle switch position. When in automatic mode and there is no link, this LED will be red.
Diagnostics are available at the 1/8" (3.5 mm) stereo jack in RS-232 format compatible with the standard
Model 903 Diagnostics GUI software, e.g. 903-0406-00. Wiring for the RS-232 connections is shown in
the table below.
The function described in the table above is relative to the PC, i.e. TXD is data transmitted from the PC to
the FMB-X-2.5 and RXD is data received into the PC from the FMB-X-2.5. This RS-232 interface also has
command based diagnostics, which provides advanced diagnostics information. See 903-0622-00
diagnostic manual for more information.
Diagnostics are also available via the RJ-45 port as Modbus TCP/IP or through an embedded web server.
Since this port is also used for general Ethernet traffic between remote and console, diagnostics packets
are handled as low priority and must be polled by the external computer. When accessed, diagnostic data
packets typically use up less than 0.1% of the Ethernet channel capacity.
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, with the toggle switch in the center position, the FMB-X-2.5 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, in auto mode, the switch toggles automatically roughly once per second
between F1 and F2 for up to 10 times. If no link is found, the switch returns to the original fiber it was on
before the link failure and waits for a link to be re-established. In this state, the "AUTO", "F1" and "F2"
LEDs are red and a continuous audible alarm is produced until a fiber link is restored. Power cycling or
manually forcing the toggle switch to a fiber (F1 or F2 position) and then back to AUTO will reset the
automatic fiber switch.
The FMB-X-2.5 also sounds a continuous audible alarm when an optical link fails in AUTO mode, even if
the other fiber has a valid link. This informs the operator of a fiber fault that otherwise might not be
noticed, as the switchover from one fiber to the other is often seamless. The alarm can be turned off by
Focal Technologies Corp.

Table 3.1-2: 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 TXD
2 RXD
5 SIG GND
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