Crestron CT-3000 Especificações descarregar pdf (Página 89)

Crestron e-control Database Manager SW-DBM

89 •• Appendices Installation & Reference Guide — DOC. 5823

ScrollBar scroller signal

Description

Maintains “scroll bar” (actually an analog gauge) displayed on touchscreen

adjacent to scroller.

Direction

System to Server

Type

Analog

Value

Bar mode: (65535 / pps) to 65535 (where pps is number of pages in the table)

Line mode: 0 to 65535

Expected Reply

None.

Comments

This signal should be hooked directly to an analog gauge.

Operates in one of two modes, Bar Mode and Line Mode, settable from the Scroller

Signal Block Definition window. Both modes show progress through the recordset,

but in slightly different ways.

Bar Mode (or “thermometer” mode) shows progress based on the last row in the

current page. The formula the server uses to calculate the value is p / pps x 65535

where p is the current page and pps is the total number of pages.

Example 1: There are 20 records in the recordset. The current scroller height is set to

8 rows. Therefore, there are three pages. On the first page, 1/3 of the gauge is filled

[value = 1/3 x 65535 = 21845]; on the second page, 2/3 of the gauge is filled [value =

2/3 x 65535 = 43690]; and on the third page, the entire gauge is filled [value = 3/3 x

65535 = 65535].

Line Mode shows progressed based on the first row on the first page through the

last row on the last page. The formula the server uses to calculate the value is (p-

1) / (pps-1) x 65535.

Example 2: Again, there are three pages. On the first page, the gauge is empty

[value = (1-1)/(3-1) x 65535 = 0]; on the second page, 1/2 of the gauge is filled [value

= (2-1)/(3-1) x 65535 = 32767]; and on the third page, the entire gauge is filled [value

= (3-1)/(3-1) x 65535 = 65535].

If you find this confusing, note that it is simply a manifestation of the classic “fence

post problem.” The easiest way to think about this is to consider a certain length of

fencing to represent the length of the recordset. Bar Mode shows sections of the

fence, one section per page. (In Example 1, there are three pages represented by

three sections of fence.) By contrast, Line Mode shows fence posts. (In Example 2,

there are also three pages but this time they are represented by three fence posts.)

Line Mode is not yet implemented in the present version.

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