6243/44 DC Voltage Current Source/Monitor Operation Manual
5.2.4 Responses to Interface Messages
5-8
(3) Serial Poll Enable (SPE)
When the 6243/44 receives this message from an external source, the 6243/44 enters the Serial Poll
mode. In this mode, when the 6243/44 is specified as a talker, status bytes are transmitted instead of
normal messages. This mode continues until the Serial Poll Disable (SPD) message or the IFC mes-
sage is received.
When the 6243/44 is sending the Service Request (SRQ) message to the controller, the response da-
ta’s bit 6 (RQS bit) becomes 1 (TRUE). When the transmission is completed, the RQS bit becomes 0
(FALSE). The Service Request (SRQ) message is sent directly through the signal line.
(4) Device Clear (DCL)
Upon receipt of DCL, the 6243/44 executes the following.
• Clears the input buffer and the output buffer.
• Resets the parser section, execution control section, and response data generation section.
• Cancels all the commands that impede the remote command to be executed next.
• Cancels the commands temporarily stopped because they are waiting for other parameters.
The following items are not executed.
• Modification of data set or stored in the 6243/44.
• Interruption of, or influence upon, the operation that the 6243/44 is currently performing.
• Modification of status bytes expects for MAV (MAV becomes 0 as the result of clearing the output
buffer).
(5) Selected Device Clear (SDC)
Performs the same operation as DCL. However, SDC can only be executed when the 6243/44 is a
listener. In other cases, this message is ignored.
(6) Go To Local (GTL)
This message sets the 6243/44 to local status. When the local status is set, all the operations on the
front panel are enabled.
(7) Local Lock Out (LLO)
This message sets the 6243/44 to local lock out status. In this status, when the 6243/44 is in the remote
status, all the operations on the front panel are disabled. (In the normal remote status, pressing the
LOCAL button will enable operations via the front panel.)
To set the 6243/44 to the normal remote status at this time, use one of the following methods.
• Send the GTL message to the 6243/44.
• Make the REN message false. (At this time, the local lock out status is also released.)
• Turn OFF and ON the power.
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