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5-33
Remote Control
5
5.7.2 Details on Query Errors
Table 5-6
Description
When a device receives an MTA from the controller before receiving a
program message terminator, it discards the incomplete message
which has been received so far and waits for the next program mes-
sage. To discard the incomplete program message, the device clears
the input/output buffer, reports a query error to the status report part,
and sets the standard status register bit 2 (query error bit).
When a device receives an MLA from the controller before complet-
ing output of a response message terminator, it automatically inter-
rupts output of the response message and waits for a next program
message. To interrupt output of the response message, the device
clears the input/output buffer, reports a query error to the status report
part, and sets the standard status register bit 2 (query error bit).
When the device cannot output a response message because the con-
troller has output a program message (including a query message) and
the next program message in succession, the device discards the
response message and waits for the next program message. A query
error is reported to the status report part like item No. 2.
When a program message containing many query messages is execut-
ed one after another, too many response messages to be stored in the
output queue (256 bytes) may be generated. If more query messages
are input and the response messages to queries must be output, the out-
put queue overflows. When this happens, the device clears the output
queue and resets the response message generation part.
The device also sets the standard event status register bit 2 (query
error bit) in the status report part.
Item
Incomplete program message
Interruption of response mes-
sage output
When the next program mes-
sage is sent without reading a
response message
Output queue overflow
No.
1
2
3
4
5.7 Standard Event Status Register