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Wired Touchpanels Crestron Series 1600

Appendix A: RS-232 Protocol

With the addition of a custom hardware option, the Series 1600 Touchpanels support

panel operation via a host computer through the RS-232 port. Crestron recommends

that the following serial data format is used.

Suggested Serial Data Format

Baud Rate: 38400 Data Bits: 8 Parity: None Stop Bits: 1

The baud rate may be altered via the RS-232 Menu when configuring the touchpanel,

however, doing so may prevent Crestron supplied software from operating with the

touchpanel. Low baud rates will cause the panel to appear unresponsive. For

example, at 300 baud, a single button press (and release) generates 12 characters and

requires more than 0.333 of a second to send. Delays as short as 0.1 of a second are

generally considered perceptible and somewhat annoying.

Command Format - Command format for all items sent to or from the touchpanel is

very simple. All items are ASCII strings terminated by a <cr>. Line feed characters

are ignored, thus <cr><lf> or <lf><cr> are also acceptable line terminators. When

the touchpanel sends a line, it is always terminated with <cr><lf>.

For all strings, the first character determines command type. Numeric arguments, if

present, are in decimal and separated by commas. No control characters are

embedded in the strings to ease processing the strings with high level languages. Be

careful when using commas in BASIC, because BASIC uses commas for field

separators when reading strings from a file using the INPUT # statement. Since we

are dealing with complete lines, use the LINE INPUT # statement to cure this

problem.

P<#> and R<#> Commands - When in RUN mode, pressing a button (assuming

that it has been joined) generates a six-character code in the format P###<cr><lf>,

where ### is a three-character decimal number in the range of 1 through 999,

providing for up to 999 functions. When the button is released, a similar code is

generated, with an 'R' in place of the 'P'. Given that only one button may be pressed

at a time, an 'R' code always follows a 'P' code. A fixed three-digit format is used to

simplify software on the host.

Codes may be sent to the touchpanel in the same form as they are received. The 'P'

form activates button feedback and the 'R' form deactivates button feedback; sending

back information received from the touchpanel (i.e., jumping pins 2 and 3) makes the

buttons momentary. Notice that the touchpanel responds to P and R commands even

when configured for other interface modes. Selecting an RS-232 interface mode

merely enables P and R commands to be issued by the touchpanel when its screen is

pressed. In addition, leading zeros are not required for commands sent to the

touchpanel; P1, P01, and P001 are all perfectly valid commands.

Compared to running on Cresnet, an RS-232 interface to a personal computer is

slower, provides less features (such as tracking, among others), is less noise immune

(Cresnet uses balanced transmission for high common mode rejection, RS-232 does

not), and requires the user to supply the control logic program in the PC.

V<chan>,<level> Command - Levels in gauge and slider objects may be set

through the RS-232 port. The command contains both the object channel number (1-

255) and level (0-65535) in decimal separated by a comma. For example, V6,32768

would set channel 6 to level 32768, or half way up.

One quick note on baud rate and smooth ramping. Ramping is accomplished by

sending successive levels to the object. To do this in 64 levels over three seconds, for

example, requires about 576 bytes worth of commands to be sent, and could not be

18 • Series 1600 Wired Touchpanels Operations & Installation Guide - DOC. 5836A

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