Multiwire Interface Messages (Atn True) - Eaton MGR10 Serie Manuel D'utilisation

6.2.2.5 Multiwire Interface Messages (ATN True)

Data transferred on the DIO lines while the controller asserts the ATN line (low) are bus
management commands and device addressing information. This is known as Command Mode.
GTL Go To Local
This causes the addressed listener to return to local panel control (exit the REMOTE
state). The device will return to remote when REN is sent again.
SDC Selective Device Clear
This 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 Configure
Parallel Poll is not implemented. This command is ignored.
GET Group Execute Trigger
This causes all devices which have the GET capability and are currently addressed to
listen to initiate a pre-programmed action (e.g. trigger, take a sweep etc.). Some devices
may also recognise a device-dependent data character or string for this function
(equivalent but requires entry into Data Mode).
Sending either GET or *TRG will make the microhmmeter perform the INITiate
command and take 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 Control
This instructs the addressed device to become the bus controller. The microhmmeter is
not capable of this function. The command is ignored.
LLO Local Lockout
This 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 set false to re-enable the push button, this also replaces all devices under
local control. The microhmmeter does not have a manual "local" button, so this command
is equivalent to the single-wire REN function.
DCL Device Clear
This 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.
MGR10 A/B/C Indice : J (version 7.0 du logiciel) 59