Honeywell 400 Series Hardware Manual page 25

Channel Ready
Load Operation Complete.
Data Ale rt
Attention
No-op Instructions
REQUEST STATUS INSTRUCTION. When the card reader receives a Request Status
instruction, it transmits major status signals identifying the following various conditions
which may exist:
Channel Ready
Attention
Data Alert
Load Operation Complete.
Although a Request Status instruction may be rejected by the card reader, the status shown
as the result of an accepted Request Status instruction will never include the Instruction
Rejected condition. The Instruction Rejected major status is returned only in response to
the specific instruction which was rejected and does not reflect the existing state of the card
reader at that time. '
The Request Status instruction does not cause any status conditions to be reset; and status,
therefore, remains unchanged by this instruction. '
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