Part 2

Interface Concepts 627HP-IB BUS MESSAGESBUS MESSAGEABORTCLEARDATALOCALLOCAL LOCKOUTCLEAR LOCKOUTAND SET LOCALPASS CONTROLREMOTEREQUIRE SERVICESTATUS BITSTATUS BYTETRIGGERDESCRIPTIONSystem controller sends this message to unconditionallyassume control of the HP-IB from the active controller.Message terminates all bus communication but does not implementthe CLEAR message.Sets all devices on the interface to pre-defined device dependentstates.Information (binary bytes) sent from a talker to a listener.The information (data) can be numeric or characters.Clears the REMOTE message from listening device(s) andreturns device(s) to front panel control.Prevents manually affecting remote program control.Clears LOCAL LOCKOUT and REMOTE messages and revertsall devices to local front panel control.This message transfers bus management responsibility fromone controller to another.Causes listening device(s) to switch from local front panelcontrol to remote program control when addressed to listen.A device can send this message at any time to signify thatthe device needs some type of interaction with the controller.Message cleared by the device's STATUS BYTE messagewhen the device no longer requires service.A byte that represents the operational conditions of a groupof devices on the HP-IB. Each device responds on a particularbit of the byte thus identifying a device dependent condition.This bit is typically sent by devices in response to a ParallelPoll operation.A byte that represents the current status of a single deviceon the HP- IB. One bit indicates whether the device sent theREQUIRE SERVICE message and the remaining seven bits indicateoptional conditions defined by the device. This byteis sent from the talking device in response to a Serial Polloperation performed by the controller.Causes listening device(s) to perform a device-dependent actionwhen addressed.Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com