Eaton MGR10 Operating Manual

Contents

MGR10 A/B/C - Revision : I (for 7.0 software revision) 606.2.2.5 Multiwire Interface Messages (ATN True)Data transferred on the DIO lines while the controller asserts the ATN line (low) are bus managementcommands and device addressing information. This is known as Command Mode.GTL Go To LocalThis causes the addressed listener to return to local panel control (exit the REMOTE state). Thedevice will return to remote when REN is sent again.SDC Selective Device ClearThis causes the addressed listener to reset to a device-dependent state. This is the same as DCL(Device Clear) but only affects the addressed device.PPC Parallel Poll ConfigureParallel Poll is not implemented. This command is ignored.GET Group Execute TriggerThis causes all devices which have the GET capability and are currently addressed to listen toinitiate a pre-programmed action (e.g. trigger, take a sweep etc.). Some devices may alsorecognise a device-dependent data character or string for this function (equivalent but requiresentry into Data Mode).Sending either GET or *TRG will make the microhmmeter perform the INITiate command andtake a measurement. The command must be sent as a single message. Sending either GET or*TRG within a command string will result in a ‘command error’ and the trigger will be ignored.TCT Take ControlThis instructs the addressed device to become the bus controller. The microhmmeter is notcapable of this function. The command is ignored.LLO Local LockoutThis disables return-to-local control (push button) on devices that recognise the command.Recognising devices accept the command whether they are addressed or not. REN must be setfalse to re-enable the push button, this also replaces all devices under local control. Themicrohmmeter does not have a manual "local" button, so this command is equivalent to thesingle-wire REN function.DCL Device ClearThis command causes all recognising devices to return to a pre-defined device-dependent state.Recognising devices respond whether they are addressed or not.The effect of DCL is as follows:- The parser is reset to await a new command.- The output queue is flushed.- The instrument is put into the Operation Complete Command Idle State andthe Operation Complete Query Idle State.