The parser will wait forever for the Completed signal as discussed above in Synchronization of GPIB Commands. Therefore there is no GPIB command (which would itself require parsing) that can stop the parser from waiting. The controller PC will have to send a GPIB bus command called Device Clear (DCL) or Selected Device Clear (SDC). SDC is directed at a particular device address. DCL will perform the same action on all devices on the Bus. Among the required things DCL and SDC do is reset the Parser. This causes the parser to stop waiting for the ‘Completed’ signal and get ready to execute a command. In the IEEE488.2 Specification, see IEEE488.2 Section 5.8 and IEEE488.1 Section 4.10 for a discussion of DCL and SDC.