Rockwell-automation 5370-CUPK Color CVIM USER-PAK Option Manual de usuario descargar pdf (Pagina 122)

Chapter 8

Defining Strings for Serial Ports and Viewports

8 – 33

This section provides an example of a serial port message string, for the

purpose of demonstrating the use of string elements, and the definition of the

Event.

For this example, we want to transmit the results of the two gage

measurements, and also to transmit the results only if the inspection fails.

First, determine the format. Suppose we want the message transmitted in the

following format for use by a printer:

Results [space] [ gage 1 result ] [space] [ gage 2 result ] [CR ] [ LF]

where [space] is the space character, [CR] is the carriage return, and [LF] is

the line feed character. A string text entry which would transmit the above

content and format would be:

“Results ” g1(3) “ ” g2(3) n

The above string text would look like this on the keyboard display:

String entry display

Transmitted String:

Results 109 112 [CR] [LF]

Assuming these gage results for an inspection – Gage 1 = 109, Gage 2 = 112

– the resulting string, if transmitted, would be as shown above.

Now let’s look at the string elements to see how the message was created:

Literal Text – consists of any characters enclosed within a pair of quotes.

Two literal text entries in the string are “Results ” (which includes a

space after the word “Results”) and “ ” (which is a space enclosed in

quotes).

Results 109 112 [CR] [LF]

Note that, as a result of the spaces in the literal entries, spaces exist between

the transmitted “fields.”

Custom Serial Port

Message Example

1 2 ... 117 118 119 120 121 122 123 124 125 126 127 ... 159 160

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Rockwell-automation 5370-CUPK Color CVIM USER-PAK Option Manual de usuario Pagina 122