Rockwell Automation 5370-CUPK Color CVIM USER-PAK Option - Manual (Page 51)

Chapter 6
Creating Custom Serial Port Messages
6 – 2
How many strings can be defined?
The Color CVIM module can store up to 340 strings, depending on how
much of the Color CVIM module’s memory is used for other purposes.
Can the custom serial port messages coexist with the standard RS-232
port communications with a host device?
The custom serial port messages may interfere with the transmission of the
response to a command from an RS-232 device. For this reason, a command
is available which allows you to disable and enable the transmission of
custom serial port messages (see Appendix C).
Do you need to set up any Color CVIM module parameters when using
custom serial port messages?
Yes, you need to select ASCII protocol, and select the appropriate baud rate
for the RS-232 port you are using.
You create a custom serial port message by defining a “string” for a given
serial port. It is the content and definition of the string that determine what
information will be sent through the serial port, and when it will be sent.
Using the string entry keyboard, you enter specific “elements” – literal text,
and/or codes of various types – which result in the transmission of one or
more corresponding “fields” comprising the serial port message.
Also, aside from defining the string content, you must specify the “event” for
each string – that is, the circumstances under which the string is transmitted.
You can also utilize a string repetition feature to transmit a single message
multiple times for the same event.
Example of a Serial Port Message String
This section provides an example of a serial port message string, for the
purpose of demonstrating string text, and the resulting message content.
Assume the gage 1 result for an inspection is 25.3, and the string text is
“Gage 1 Result =” g1
where the g1 in the string text is a “data code” which represents the results
from gage 1. The message transmitted would be these ASCII characters –
Gage_1_Result_= _ _ _25.300 (where _ indicates a space character)
For a listing of the entire ASCII character set, refer to Appendix B.
Creating Custom Serial
Port Messages