Rockwell-automation Logix5000 Controllers ASCII Strings Programming Ma Manual de usuario descargar pdf (Pagina 12)

Chapter 1 Communicating with an ASCII device

To configure the user protocol, use these steps.

1. In the Controller Properties dialog box, click the User Protocol tab.

• Enter a buffer size greater than or equal to the greatest number of

characters in a transmission. Twice the number of characters is a good

guideline.

• For ABL or ARL instructions, enter termination characters to mark the

end of the data. For ASCII codes, see ASCII Character Codes on

page

29.

If the device sends Then Tips

One termination character

•

In the

Termination Character 1

box, type the

hexadecimal ASCII code for the first character.

• In the Termination Character 2 box, type $FF.

For printable characters, such as 1 or A, type the character.

Two termination characters

In the Termination Character 1 and 2 boxes, type the

hexadecimal ASCII code for each character.

• For AWA instruction, enter append characters. For ASCII codes, see

ASCII Character Codes on page 29.

To append Then Tips

One character

•

In the Append Character 1 box, type the

hexadecimal ASCII code for the first character.

• In the Append Character 2 box, type $FF.

For printable characters, such as 1 or A, type the character.

Two characters

In the Append Character 1 and 2 boxes, type the

hexadecimal ASCII code for each character.

Configure the User Protocol

12 Rockwell Automation Publication 1756-PM013D-EN-P - October 2014

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Rockwell-automation Logix5000 Controllers ASCII Strings Programming Ma Manual de usuario Pagina 12