Model 7002Switch System Instruction Manual - Advanced Test ...

IEEE-488 ReferenceNOTEController programming information forusing the IBM PC interface through theCapital Equipment Corporation (CEC),I\O Tech, and National IEEE-488 interfacesis located in the Appendix.5.5 Front panel aspects of IEEE-488operationThe following paragraphs discuss aspects of the front panelthat are part of IEEE-488 operation, including messages, statusindicators, and the LOCAL key.A partial list of HP BASIC 4.0 statements is shown in Table5-2. The statements have a one or three digit argument thatmust be specified. The first digit is the interface select code,which is set to 7 at the factory. The last two digits of thosestatements requiring a 3-digit argument specify the primaryaddress.Those statements with a 3-digit argument show a primary addressof 7 (the factory set primary address). For a differentaddress, you would, of course, change the last two digits tothe required value. For example, to send a GTL command toa device using a primary address of 17, the following statementwould be used: LOCAL 717.Some of the statements have two forms; the exact configurationdepends on the command to be sent over the bus. For example,CLEAR 7 sends a DCL command, while CLEAR716 sends the SDC command to a device with a primary addressof 16.Table 5-2HP BASIC 4.0 IEEE-488 statements5.5.1 Error and status messagesTable 4-1 in Section 4 summarizes the error and status messagesassociated with Model 7002 operation. Note that theinstrument may be programmed to generate an SRQ, andcommand queries can be performed to check for specific errorconditions.5.5.2 IEEE-488 status indicatorsThe REM (remote), TALK (talk), LSTN (listen), and SRQ(service request) annunciators show the present IEEE-488status of the instrument. Each of these indicators is brieflydescribed below.REM ⎯ As the name implies, this indicator shows when theinstrument is in the remote state. Note that REM does notnecessarily indicate the state of the REM line, as the instrumentmust be addressed to listen with REM true before theREM indicator turns on. When the instrument is in remote,all front panel keys except for the LOCAL key are lockedout. When REM is turned off, the instrument is in the localstate, and front panel operation is restored.ActionTransmit string to device 07.Obtain string from device 07.Send GTL to device 07.Send SDC to device 07.Send DCL to all devices.Send remote enable.Cancel remote enable.Serial poll device 07.Send local lockout.Send GET to device 07.Send IFC.BASIC statementOUTPUT 707;A$ENTER 707;A$LOCAL 707CLEAR 707CLEAR 7REMOTE 7LOCAL 7SPOLL (707)LOCAL LOCKOUT 7TRIGGER 707ABORT 7TALK ⎯ This indicator is on when the instrument is in thetalker active state. The unit is placed in this state by addressingit to talk with the correct MTA (My Talk Address) command.TALK is off when the unit is in the talker idle state.The instrument is placed in the talker idle state by sending itan UNT (Untalk) command, addressing it to listen, or withthe IFC (Interface Clear) command.LSTN ⎯ This indicator is on when the Model 7002 is in thelistener active state, which is activated by addressing the instrumentto listen with the correct MLA (My Listen Address)command. Listen is off when the unit is in the listener idlestate. The unit can be placed in the listener idle state by send-5-5