Configure The User Protocol - Rockwell Automation Logix 5000 Series Programming Manual

Chapter 1 Communicating with an ASCII device

Configure the User Protocol

12
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
page 27.
If the device sends Then
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.
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
To append Then
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.
Two characters In the Append Character 1 and 2 boxes, type the
hexadecimal ASCII code for each character.
• If the ASCII device is configured for XON/XOFF flow control, select
the XON/XOFF check box.
• If the ASCII device is a CRT or pre-configured for half duplex
transmission, select the Echo Mode check box.
• Choose the Delete Mode using the following considerations:
Rockwell Automation Publication 1756-PM013H-EN-P - March 2022
ASCII Character Codes
Tips
For printable characters, such as 1 or A, type the
character.
on page 27.
Tips
For printable characters, such as 1 or A, type the
character.
on