Rockwell-automation 5370-UPK CVIM USER-PAK Option Manual de usuario descargar pdf (Pagina 106)

Chapter 8

Defining Strings for Serial Ports and Viewports

8–30

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.”

Data Codes – Using a data code results in the transmission of a field

containing corresponding data. The example includes two data codes, g1

Custom Serial Port

Message Example

1 2 ... 101 102 103 104 105 106 107 108 109 110 111 ... 141 142

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Rockwell-automation 5370-UPK CVIM USER-PAK Option Manual de usuario Pagina 106