Belar FMHD-1 Operator'S Manual Download

Page: 31 / 58

FMHD-1 Operator’s Manual

BELAR ELECTRONICS LABORATORY, INC.

Page 23

5.9

Alarms/Relays Screen

Twenty-two signal characteristics are continuously monitored by the

FMHD-1

to detect improper or

undesirable hybrid FM IBOC broadcast system operating conditions. This screen allows the user to set
alarm thresholds and alarm timeouts for these conditions, and to select from three types of indications for
each alarm condition. Alarms may be indicated by any combination of three methods. The three alarm
methods are a relay contact closure, an e-mail alarm notice sent out over the LAN to which the

FMHD-1

is connected, and an on-screen red alarm notification banner. For the relay contact-closure alarm
indication, contacts on one of four different relays may be selected; for the e-mail notice, one of four
distinct alarm-message-address combinations may be selected.

The twenty-two monitored signals, their alarm threshold ranges, and the default alarm threshold values
are shown in Table 3:

FMHD-1

Alarms/Relays Screen Defaults and Ranges.”, page 46. The

Alarms/Relay Screen allows selection of which relay and e-mail message is activated, but the destination
address and contents of the e-mail message are entered via the E-mail Settings Popup Menu.

The Alarms/Relay Screen has seven columns of readouts. This requires a different approach to screen
navigation with the encoder wheel. Upon opening the Screen, rotation of the encoder moves the cursor
vertically through the left-hand column of 22 possible alarm conditions. Pressing the encoder highlights
in green the signal name at which the cursor is resting. Once the signal name is highlighted, further
rotation of the encoder moves the cursor horizontally left or right across the five columns of settings, in
wrap-around fashion. By pressing the encoder a second time, the setting where the cursor rests is
highlighted green, and adjustments may be made to that setting by rotating the encoder.

The seventh column contains tri-color indicators that show the alarm status for each row. They are green
when no alarm condition exists for the corresponding signal; they are red when an alarm condition has
existed continuously for the duration set by the alarm “Time” parameter. A yellow indication means an
alarm condition has started the individual alarm timer, but that the timer has not yet reached the user-set
timeout value.

To exit the screen, reverse the encoder manipulation sequence: press the encoder to return the parameter
to yellow, rotate the knob to move the cursor to the “Event” column, press the encoder knob to turn the

green event to yellow, and then rotate the encoder until the cursor lands on the

▲

▼

icon. Pressing the

encoder again, enables selection of other screens by rotating the encoder knob.

One special case exists for this screen. The “Total Peak” alarm has no associated timeout. The
over-modulation alarm is triggered immediately when a modulation indication exceeds the user-set
threshold.

Setting the threshold of

any

loss-of-signal

alarm to 0.0% disables the alarm function for that signal

parameter.

The FMHD-1 Popup Menus

The

FMHD-1

Popup Menus are blue display panes that group the parameter settings and information

specific to one aspect of monitor operation in one place. Typically, these are the lesser-used adjustments
that would be inconvenient to control from the main

FMHD-

1 display screens. The panes are selected for

presentation by a screen pull-down that displays the categories (and sub-categories) of Popup Menus.
Their access and navigation are described in detail in Sections 4.2.5 and 4.2.6, beginning on page 12.