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Operation
manual as <Mod: IF – Level>. We may also show selection of a specific value for the parameter
using the notation <Function: Column – Row> = value(#). The value is descriptive and the # in
parenthesis is the selection number key to press for optional parameters, if applicable, in the
direct entry mode explained below.
It is convenient to imagine the matrix as 3 dimensional spreadsheet just like a multi-sheet Excel
workbook, with the different "sheets" selected by the buttons for Unit, Mod, Demod and Interface,
while navigation on a given sheet is accomplished using the up, down, left and right arrow keys.
Until you become familiar with the location of parameters using the front panel, it is convenient to
use the Matrix Tables 3-1 through 3-4 as a quick reference.
3.1.3.2 Monitoring Modem Parameters
Any available modem parameter is monitored by simply using the function and arrow keys to
display the desired parameter in the LCD display. The item displayed will remain until changed or
power is removed from the modem unit. The display is "Live", therefore when a currently
displayed parameter changes the display will change without operator intervention. When
multiple parameters could be displayed (such as when multiple test modes are currently running
or multiple alarms are present) only the highest priority item is displayed. When that item is no
longer valid the next highest priority is displayed. The priority of items is fixed within the modem
software.
3.1.3.3 Changing Modem Parameters
To set any parameter, the 4 functional area keys and the 4 arrow keys to the right of the LCD
display are first used to select the parameter to be set, then one of several "entry" modes is used
to change the parameter. In any entry mode pressing the "Edit" key to indicate a new entry, then
editing the parameter via the arrow keys and the numeric keypad and finalizing the data entry
using the "Enter" key will work. The "Quick" entry mode allows direct entry of a new value without
first pressing the "Edit" key. All entry items take one of two forms:
1. Numeric entry such as frequency or bit rate; and
2. Selection from a list such as selecting FEC rates 1/2, 3/4 or 7/8.
Numeric entries may be entered by performing one of the following:
•
When a numeric parameter is displayed, it can be changed by pressing the "Edit"
key, then using the left and right arrow keys to select the first digit to be changed and
entering a new digit. Successive digit entries go to successive characters on the
display, skipping over the decimal point which is in a fixed location. Leading zeros
must be used to enter smaller numbers than are currently displayed, and trailing
zeroes are used to eliminate trailing digits not required. The entry is finalized by
pressing the "Enter" key.
•
An alternate edit mode is accomplished by first pressing the "Edit" key, then using
the left and right arrow keys to select the first digit to be changed. The digit is
"scrolled" using the up and down arrow key. Additional digits are pointed to using the
left and right arrows and also scrolled. Finish the edit by pressing the enter key.
Overflow when scrolling up through 9 will increment the next higher digit while
underflow will decrement the next higher digit.
•
Direct entry can be accomplished if the <Unit: Keyboard – Entry Mode> is set to
"Quick". In this mode the current parameter can be changed by simply entering new
information, which completely overwrites the existing parameter. For example when
viewing the Modulator Data Bit Rate of 256.000kbps entering the digits 47.243
(including the decimal point) and pressing "Enter" will change to that new data rate.
Note that a leading "0" did not have to be entered to overwrite the "2" of the existing
parameter.
Page 3-6
PSM-500/500L/500LT SCPC Satellite Modem
PSM-500/500L/500LT - Rev. 0.91
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