Eaton MGR10 Serie Manuel D'utilisation page 58

The 5 General Interface Management Lines are;
REN Remote Enable
This is used only by the System Controller to enable devices to be subsequently placed in
the remote programming mode. When true, all listeners capable of remote operation are
placed in remote when addressed to listen. When false, all devices return to local
operation. All devices capable of both remote and local operation must monitor REN at
all times. Devices must respond to REN within 100uS.
The REN command is the only command that will put the instrument into remote mode.
The front-panel keys are disabled, and the 'Rem' legend appears on the display. The
'Lstn' and 'Talk' legends indicate when the instrument is addressed.
The instrument may be returned to local operation by sending the GTL command while
the instrument is addressed to listen.
IFC Interface Clear
This is used only by the System Controller to halt current operations (communications) on
the bus (i.e. unaddress all talkers and listeners and disable Serial Poll - the idle state). All
devices must monitor IFC at all times and respond within 100uS (minimum pulse width
for IFC).
EOI End Or Identify
When ATN is true the EOI line is used by a controller to execute a parallel poll. When
ATN is false, the EOI line is used by an active talker to indicate the last byte of a data
message.
SRQ Service Request
This is used by one or more devices to indicate the need for attention and can act as an
interruption of the current sequence of events. Typically SRQ indicates data is ready to
transmit and/or an error condition (e.g. syntax error, overload, trigger too fast etc.) exists.
The controller can mask the SRQ interrupt and must perform a Serial Poll of devices
(when there is more than one) to determine who requested service and why.
ATN Attention
All devices must monitor ATN at all times and respond to it within 200nS. When true
ATN places the interface in the Command Mode where all devices accept (handshake)
data on the DIO lines and interpret it as it Commands (see Multi-wire Interface Messages
below). When false ATN places the interface in the Data Mode where the active talker
sources device dependent Data to all active listeners. Addresses are sent over the bus
during the Command Mode.
MGR10 A/B/C Indice : J (version 7.0 du logiciel) 58