THEORY GUIDE Cassette Handling
10DEC05
TG4825-1
Page
47 of 120
1. The operator inserts a CASSETTE into the INPUT SLOT.
2. When the CASSETTE ENTRY SENSOR S1 is blocked by the end of the CASSETTE, a
“Cassette Detected” message is sent to the MSC BOARD A1.
3. The MSC BOARD A1 sends a signal to the INTERNAL BAR CODE READER, which then
reads the BAR CODE LABEL on the CASSETTE. The BAR CODE provides the following
information about the CASSETTE:
• size
• speed
• serial number
4. The INTERNAL BAR CODE READER sends the information about the CASSETTE to the
MSC BOARD A1.
5. The system emits a beep.
6. The MSC BOARD A1 sends:
• “Cassette Detected” message to the MCPU BOARD A2
• CASSETTE ID to the MCPU BOARD A2
7. The MCPU BOARD A2 sends:
• “Cassette Detected” message to the MSC BOARD A1
• “Scan Request” message to the INTERNAL PC
Component Description
CASSETTE ENTRY
SENSOR S1
The CASSETTE ENTRY SENSOR is continually monitored to detect
a CASSETTE. When a CASSETTE is inserted, the light beam of S1
is blocked.
INTERNAL BAR
CODE READER
Reads the BAR CODE information from BAR CODE LABEL on the
CASSETTE and sends it to the MCPU BOARD A2. The BAR CODE
READER also sends information to the MSC BOARD A1 using an
RS-232 connection.
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