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Turns specific audible alarms on and off.
Note that an application may opt to turn off all alarms by issuing a MSG_SET with no data. Therefore, an application should also be prepared to receive an empty array from a Source with an MSG_GET. (i.e., pTW_ARRAY->NumItems == 0)
The easiest way to test for allowed values is to try to set them all with MSG_SET. If not all are allowed, the Source will return TWRC_CHECKSTATUS with those values that it supports.
It is worth noting that the alarms do not have to be present in the device for a Source to make use of this capability. If the device is capable of alerting the Source to these various kinds of conditions, but is unable to generate the alarms, itself; then the Source may opt to generate them on its behalf.
TWAL_ALARM is a catchall for alarms not explicitly listed. It is also used where a device only provides control over a single, multi-use alarm. For instance, if a device beeps for both jams and bar-codes, but doesn’t allow independent control of the alarms, then it should report TWAL_ALARM to cover them, and not TWAL_BARCODE, TWAL_JAM.
TWAL_FEEDERERROR covers paper handling errors such as jams, double-feeds, skewing and the like; conditions that most likely stop scanning.
TWAL_FEEDERWARNING covers non-fatal events, such as feeder empty.
TWAL_DOUBLEFEED, TWAL_JAM and TWALSKEW cover paper handling errors.
TWAL_BARCODE and TWAL_PATCHCODE generate alarms when an image with this kind of data is recognized.
TWAL_POWER generates alarms for any changes in power to the device.
Type: TW_UINT
Value after MSG_OPENDS: (may be remembered from a pervious session)
After MSG_RESET/MSG_RESETALL: (selected by the data source writer)
Allowed Values: TWAL_ALARM TWAL_FEEDERERROR TWAL_FEEDERWARNING TWAL_BARCODE TWAL_DOUBLEFEED TWAL_JAM TWAL_PATCHCODE TWAL_POWER TWAL_SKEW
MSG_GET TW_ARRAY
MSG_GETCURRENT TW_ARRAY
MSG_GETDEFAULT TW_ARRAY
MSG_SET TW_ONEVALUE TW_ARRAY
MSG_RESET TW_ARRAY
MSG_SETCONSTRAINT TW_ONEVALUE
TW_ARRAY
MSG_QUERYSUPPORT TW_ONEVALUE
None
Version 1.8
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