Residential Control Systems TXB16 Manual do Proprietário descarregar pdf (Página 143)

Chapter 13 Video Output 129

The controller can store up to 32 RAM video screens, depending on your schedule size. The screens are

stored in the same RAM that holds your schedule actions. If you have a very large number of actions, you

might not have space for all 32 RAM video screens. Each screen takes 264 bytes of RAM (11 rows X 24

characters per row). Therefore, 32 screens take up 8448 bytes.

This same RAM is also used for the "data log". The more RAM video screens you use, the less room there

is in the data log. However, since the data log is typically 64K bytes in size, losing a few thousand bytes is

probably not significant.

If there's not enough room in the controller to hold your schedule and the desired number of video screens,

you will get an error message when you load the schedule. You will then have to either reduce the number

of screens or delete some actions.

Displaying RAM Video Screens

These screens are displayed using the following video command:

Display Video Screen ##

You can display a RAM video screen just like you would any other video screen; simply enter the desired

screen number. The "RAM video screens" are numbered 100 through 131 (assuming you have configured

the controller for all 32 available screens). If you have less than 32 screens, they are numbered starting at

100 and progressing upwards.

Once you display a screen, you may want to switch to another screen using your remote control.

HomeVision does not provide any automatic way to do this. Instead, you have to write the commands

yourself to switch screens. The methodology would be similar to switching between custom screens. The

basic approach is to use a variable to keep track of what screen you're displaying. In the received infrared

signal event for each button, you check the variable to see if you're displaying a RAM video screen. If you

are, you then take the desired action (switch to another RAM screen, display a built-in screen, shut the video

system off, etc.). Refer to the "How To" file for details on creating and navigating your own screens.

Writing Text To RAM Video Screens

There are two ways to get text into the RAM video screens from a PC:

1) By sending commands to the controller over the serial interface, usually from a computer. The

commands to write the text are detailed in the "Serial Protocol" file, which describes all the serial

commands. This capability is intended to allow computer programs to send text to HomeVision for

viewing later. There are no programs yet available that use this capability. However, you may write

your own programs that do so.

2) By reading a text file that's on a computer and transmitting it to the controller. You can initiate this

action in your schedule by sending a serial command to the computer. The computer, which must

be running the HomeVision software, will then read the text file into the desired RAM video screen.

The second method is detailed below.

To read a text file into a controller RAM video screen, enter a serial interface command in your schedule to

transmit the following ASCII text:

Read text file filename.txt into video screen ###

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Residential Control Systems TXB16 Manual do Proprietário Página 143