Logix5000 Controllers General Instructions - SLAC Confluence

574 ASCII Serial Port Instructions (ABL, ACB, ACL, AHL, ARD, ARL, AWA, AWT)ASCII Error CodesIf an ASCII serial port instruction fails to execute, the ERROR memberof its SERIAL_PORT_CONTROL structure will contain one of thefollowing hexadecimal error codes:This Hex Code Indicates That the16#2 Modem went offline.16#3 CTS signal was lost during communication.16#4 Serial port was in system mode.16#A Before the instruction executed, the .UL bit was set. This prevents the execution of the instruction.16#C The controller changed from Run mode to Program mode. This stops the execution of an ASCII serial port instructionand clears the queue.16#D In the Controller Properties dialog box, User Protocol tab, the buffer size or echo mode parameters were changed andapplied. This stops the execution of an ASCII serial port instruction and clears the queue.16#E ACL instruction executed.16#F Serial port configuration changed from User mode to System mode. This stops the execution of an ASCII serial portinstruction and clears the ASCII serial port instruction queue.16#51 The LEN value of the string tag is either negative or greater than the DATA size of the string tag.16#54 The Serial Port Control Length is greater than the size of the buffer.16#55 The Serial Port Control Length is either negative or greater than the size of the Source or Destination.String Data TypesYou store ASCII characters in tags that use a string data type.• You can use the default STRING data type. It stores up to 82characters.• You can create a new string data type that stores less or morecharacters.To create a new string data type, see Logix5000 Controllers CommonProcedures, publication 1756-PM001.Publication 1756-RM003I-EN-P - January 2007