3-50 BOP HIPWR 1113153.5.3.5.3 TRIGGER OPERATION DIFFERENCES IN BIT 4886The BOP/BIT 4886 only supports *TRG while the BOP 1KW supports TRIGGER:SOURCEEXTERNAL, BUS and IMMEDIATE. The command TRIG:SOUR BUS must be sent before usingtrigger in the BOP 1KW.3.5.4 IEEE 488 (GPIB) BUS PROTOCOLTable 3-17 defines the interface capabilities of the BOP 1KW power supply (Talker/Listener) rel-ative to the IEEE 488 (GPIB) bus (reference document ANSI/IEEE Std 488: IEEE Standard DigitalInterface for Programmable Instrumentation) communicating with a Host Computer—Controller(Talker/Listener). Tables 3-18 and 3-19 define the messages sent by the BOP, or received by theBOP, via the IEEE 488 bus in IEEE 488 command mode and IEEE 488 data mode, respectively.These messages are enabled during the “handshake” cycle, with the BOP power supply operat-ing as either a Talker or a Listener. (See PAR. 3.5.3.1 to change the GPIB address.TABLE 3-17. IEEE 488 (GPIB) BUS INTERFACE FUNCTIONSFUNCTION SUBSETSYMBOL COMMENTSSource Handshake SH1 Complete Capability (Interface can receive multiline messages)Acceptor Handshake AH1 Complete Capability (Interface can receive multiline messages)Talker T6 Basic talker, serial poll, unaddress if MLA (My Listen Address) (one-byte address)Listener L4 Basic listener, unaddress if MTA (My Talk Address) (one-byte address).Service Request SR1 Complete Capability. The interface sets the SRQ line true if there is an enabled ser-vice request condition.Remote/Local RL1Complete capability. Interface selects either local or remote information. In localmode the BOP executes front panel commands, but can be set to remote mode viaIEEE 488 bus. When in Remote mode all front panel keys are disabled exceptLOCAL function key. LOCAL function key can be disabled using keypad lockoutcommand (see Appendix B, PAR. B.136) so that only the controller or a power oncondition can restore Local mode.Parallel Poll PP0 No CapabilityDevice Clear DC1 Complete Capability. BOP accepts DCL (Device Clear) and SDC (Selected DeviceClear).Device Trigger DT1 Respond to *TRG and trigger functions.Controller C0 No CapabilityTABLE 3-18. IEEE 488 (GPIB) BUS COMMAND MODE MESSAGESMNEMONIC MESSAGEDESCRIPTION COMMENTSATN Attention ReceivedDAC Data accepted Received or SentDAV Data Valid Received or SentDCL Device Clear Received (see PAR. 3.5.3.1.2)IFC Interface Clear Received
