Detailed Descriptions of Commands
HEAD HOURS (D2H)
Requests the accumulated time of use of the heads. When this command is issued, the VTR returns 5 bytes of data to indicate the time
Example: When the time is 529 hours:
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RxD | D2H |
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TxD |
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| 30H |
| 30H |
| 35H |
| 32H |
| 39H |
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OPERATION HOURS (D3H)
Requests the accumulated powered time of the VTR. When this command is issued, the VTR returns 5 bytes of data to indicate the time
Example: When the time is 1852 hours:
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RxD | D3H |
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TxD |
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| 30H |
| 31H |
| 38H |
| 35H |
| 32H |
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ROM VERSION INQ (72H)
Requests the ROM version of the VTR. When this command is issued, a
bit 7 | bit 6 | bit 5 | bit 4 | bit 3 | bit 2 | bit 1 | bit 0 |
1 | Version number numerals above | Version number numerals below the decimal | |||||
the decimal point. |
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Example: When the version number is 1.5:
CMD
TxD 72H
RxD 95H
ACK
VCR INQ (FBH)
Checks whether the connected equipment is a VTR or not. When the connected equipment is a VTR, ACK is returned. If not, NAK is returned.
Tape Run System Commands
PLAY (3AH)
This command sets the VTR to PLAY mode.
F.FWD (ABH)
This command sets the VTR to Fast Forward mode.
REW (ACH)
This command sets the VTR to Rewind mode.
FORWARD SHUTTLE (B5H)
This command sets the VTR to Playback mode at the specified speed in the forward direction.
Parameter | Speed |
30H | STILL |
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31H | Fwd × 1/30 |
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32H | Fwd × 1/10 |
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33H | Fwd × 1/5 |
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34H | Fwd × 1/2 |
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35H | Fwd × 1 |
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36H | Fwd × 2 |
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37H | Fwd × 5 |
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38H | Fwd × 16 |
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Example: To play back at 1/30 speed in the forward direction:
CMD | SPEED DATA | |||
RxD | B5H |
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TxD 0AH 0AH
ACK ACK
REVERSE SHUTTLE (B6H)
This command sets the VTR to Playback mode at the specified speed in the reverse direction.
Parameter | Speed |
30H | STILL |
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31H | Rev × 1/30 |
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32H | Rev × 1/10 |
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33H | Rev × 1/5 |
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34H | Rev × 1/2 |
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35H | Rev × 1 |
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36H | Rev × 2 |
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37H | Rev × 5 |
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38H | Rev × 16 |
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