1766-RM001A-EN-P MicroLogix 1400 Programmable Controllers ...

368 ASCII InstructionsThis instruction executes immediately upon the rung transitioning to atrue state. Any ASCII transmissions in progress are terminated when theACL instruction executes.TIPThe ASCII queue may contain up to 16 instructions that are waiting to run.Entering ParametersEnter the following parameters when programming this instruction:• Channel is the number of the RS-232 port, Channel 0.• Receive Buffer clears the Receive buffer when set to “Yes” andremoves the Receive ASCII port control instructions (ARL and ARD)from the ASCII queue.• Transmit Buffer clears the Transmit buffer when set to “Yes” andremoves the Transmit ASCII port control instructions (AWA andAWT) from the ASCII queue.Addressing Modes and File Types can be used as shown below:ACL Instruction Valid Addressing Modes and File TypesFor definitions of the terms used in this table see Using the Instruction Descriptions on page 92.Data Files (1)Function FilesAddressModeAddress LevelParameterOISBT, C, RNFSTLMG, PDRI/RIXPLSRTCHSCPTOX, PWMXSTIEIIBHIMMILCDCS - CommsIOS - I/ODLS - Data LogImmediateDirectIndirectBitWordLong WordElementChannel • •Receive Buffer • •Transmit Buffer • •(1) The Control data file is the only valid file type for the Control Element.Instruction OperationWhen Clear Receive Buffer and Clear Transmit Buffer are both set to Yes,all Receive and Transmit instructions (ARL, ARD, AWA, and AWT) areremoved from the ASCII queue.Publication 1766-RM001A-EN-P - October 2008