Detailed Descriptions of Commands
ALARM PRESET SENSE (DAH+CAH)
Requests the alarm recording setting status. When this command is issued, the VTR returns the alarm recording settings, as shown below.
| bit 7 |
| bit 6 | bit 5 |
| bit 4 | bit 3 |
| bit 2 |
| bit 1 |
| bit 0 |
byte 1 | 1 |
| 0 | 0 |
| 0 | 0 |
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| ALARM MODE |
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byte 2 | 0 |
| 0 | 0 |
| 0 | 0 |
| REC MODE (After Alarm) | ||||
byte 3 | TAPE END | ALARM | 0 |
| TIME |
| Hundreds of ALARM OFF TIME |
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OFF |
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byte 4 |
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byte 5 | 0 |
| 0 | 0 |
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| Hundreds of PREALARM TIME |
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byte 6 |
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Example: When switching to Recording mode 2 upon alarm input and returning to normal recording in 30 seconds:
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RxD |
| DAH |
| CAH |
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TxD |
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| 80H |
| 02H |
| 10H |
| 30H |
| 00H |
| 00H |
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First byte
Bits 2 to 0: Show the mode of alarm recording.
000:Normal mode.
001:Interleave mode
010:Event mode
011:
100:Frame mode
Second byte
Bits 2 to 0: Show the recording mode after alarm input.
001:Recording mode 1
010:Recording mode 2
011:Recording mode 3
100:Recording mode 4
101:Recording mode 5
Third byte
Shows the condition for canceling the alarm recording started by the alarm input.
Bit 7: 1 when canceling the alarm recording when it reaches the end of the tape
Bit 6: 1 when canceling the alarm recording when the alarm input stops
Bit 4: 1 when canceling the alarm recording when the time specified by the third and fourth bytes has elapsed
Third and fourth bytes
Show the time in units of seconds until canceling alarm recording in BCD.
This time setting is valid only when bit 4 of the third byte is set to 1.
Fifth and sixth bytes
Show the time in units of seconds to record before alarm input in
TIMER PRESET SENSE (DAH+CBH)
Requests the timer setting status. When this command is issued with the number of the desired timer number and ENTER (40H), the VTR returns the settings of the specified timer as shown below.
To check all the timer settings, repeat this command as many times as the number of timers.
| bit 7 |
| bit 6 |
| bit 5 |
| bit 4 | bit 3 |
| bit 2 | bit 1 |
| bit 0 |
byte 1 | 1 |
| 0 |
| 0 |
| 0 | 0 |
| TIMER PRESET NUMBER | |||
byte 2 |
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| WEEK |
| 0 |
| REC MODE (TIME 1) | |||||
byte 3 |
| Tens of HOURS (TIME 1) |
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byte 4 |
| Tens of MINUTES (TIME 1) |
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byte 5 | 0 |
| 0 |
| 0 |
| 0 | 0 |
| REC MODE (TIME 2) | |||
byte 6 |
| Tens of HOURS (TIME 2) |
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byte 7 |
| Tens of MINUTES (TIME 2) |
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Example: In a case when Timer 1 has been set for Recording mode 1 at 8:00 a.m. and Recording mode
2 at 5:30 p.m. on Monday:
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| ENTER |
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RxD |
| DAH |
| CBH |
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TxD |
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| 0AH |
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| 0AH |
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| 81H | 11H |
| 08H |
| 00H |
| 02H |
| 17H |
| 30H |
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First byte
Bits 2 to 0: Show the timer number.
001:Timer 1
010:Timer 2
011:Timer 3
100:Timer 4
101:Timer 5
110:Timer 6
111:Timer 7
Second byte
Bits 2 to 0: Show the Recording mode number for Time 1.
Bits 7 to 4: Show the day of the week. 0000: No setting
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