The output lower limit is 48d (0 in ASCII) and the output upper limit is 57d (9 in ASCII). Set the input lower limit to 0d, and the input upper limit to 9d. For this, we will utilize two ASCALEL symbols (Analog Scaler with I/O Limits). Now that we have the tens and units digits, we need to convert from decimal to ASCII. The quotient will contain the tens digit, and the remainder will contain the units digit. Enter a divisor of 10d, since we need to divide by ten. Run the signal "projector_volume" into the ain. We'll use a DIVMOD (Analog Divmod) signal. The next step is to split the volume into tens and units bytes. The mute level should be 0d, although I'm not going to go into the specifics of adding a mute button in this example (use a toggle, the same way you would with a regular analog ramp controlling a Crestron volume control) This will give us the range of values require d by the projector. Our lower limit will be 0d, and our upper limit will be 63d. 5s, or 5 seconds, is a good starting point. The ramp time will be the total amount of time des ired for the volume to go from 0% to 100%. The aout signal will be called projector_volume.
We will tie the up and down inputs to our volume buttons on the touchpanel (projector_volume_up and projector_volume_down).
We'll start by inserting a RAMPL (Analog Ramp Bounds Limited) symbol. The parameter is the desired volume level, ranging from 000 to 063. The AVL command will allow us to adjust the projector's volume. The parameter is also always three bytes. A colon separates the command and the parameter. The basic format of the serial strings is: Command:Parameter. You can download a copy of the user manual, and find the RS-232 protocol information on pages 64 and 65. The projector I have selected for this example is a Panasonic PT-LB20U. The following example is a summary of techniques outlined by Matt, which I have modified slightly to use Crestron SIMPL Windows entirely, without any SIMPL+.Īs in the last example, I don't have this projector here to test, so this code is for demonstration purposes only. The projector's protocol did not include a "volume up" or "volume down" command, forcing the programmer to send discrete volume levels for all 64 possible volume levels.
This is a response to Crestron Yahoo! Group post number 54920 by jourabchid, regarding sending volume commands to a Panasonic projector from a Crestron processor. As our last example involved parsing an ASCII serial string for volume level, it seems only fitting that we now discuss sending volume in a similar protocol.
0 kommentar(er)
