Detailed Descriptions of Commands
T/D SENSE (DAH+C3H)
Requests the date/time of recording. When this command is issued, the VTR returns the date/time (year/month/day/hour/minute/second in sequence) of the current playback picture in playback mode or the current date/time in other operation modes.
Example: In the case of Jan. 31, 1988, 3:10 and 58 seconds p.m.:
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| DAH |
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| C3H |
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TxD |
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| 0AH |
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| 39H |
| 38H |
| 30H |
| 31H |
| 33H |
| 31H |
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| ACK | 9 | 8 | 0 | 1 | 3 | 1 |
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| 31H |
| 35H | 31H |
| 30H |
| 35H |
| 38H |
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| 1 | 5 | 1 | 0 | 5 | 8 |
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FRAME SENSE (DAH+C5H)
Requests the position on the tape of the current playback picture. When this command is issued, the VTR returns the time code data of the current playback picture and the subdata to indicate the area within the frame. The value of the subdata depends on the image quality mode, as shown below.
| HYPER | SUPER | HIGH | MIDDLE | LOW |
Subdata value | 0 | 0 to 1 | 0 to 3 | 0 to 7 | 0 to 15 |
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Example: If the time code is 01:23:45:12 and the subdata value is 3:
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RxD |
| DAH |
| C5H |
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TxD |
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| 0AH |
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| 30H |
| 31H |
| 32H |
| 33H |
| 34H |
| 35H |
| 31H |
| 32H |
| 30H |
| 33H |
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| ACK | 0 | 1 | 2 | 3 | 4 | 5 | 1 | 2 | 0 | 3 |
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ALARM SENSE (DAH+C4H)
Requests the channel of the generated alarm. When this command is issued, the VTR returns the data shown below. Each flag is set when an alarm is generated and reset when the condition to cancel the alarm is satisfied.
| bit 7 | bit 6 | bit 5 | bit 4 | bit 3 | bit 2 | bit 1 | bit 0 |
byte 1 | 1 | 0 | 0 | 0 | 0 | 0 | ALL CAMERAS | |
byte 2 | CAMERA4 | CAMERA3 | CAMERA2 | CAMERA1 | ||||
byte 3 | CAMERA8 | CAMERA7 | CAMERA6 | CAMERA5 | ||||
byte 4 | CAMERA12 | CAMERA11 | CAMERA10 | CAMERA9 | ||||
byte 5 | CAMERA16 | CAMERA15 | CAMERA14 | CAMERA13 | ||||
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RxD |
| DAH |
| C4H |
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TxD |
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| 0AH |
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| 80H |
| xxH |
| xxH |
| xxH |
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| ACK |
| DATA DATA DATA DATA DATA | |||||||||||
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First byte
Bits 1 and 0: Show the status of the alarm input common to all cameras.
00:No alarm input
01:Alarm generated
Second to fifth bytes
Each two bits show the status of the alarm input of the corresponding camera.
00:No alarm input
01:Alarm generated
ALARM LIST SENSE (DAH+C7H)
Requests information on the alarm list. When this command is issued with the number of the desired alarm recording on the list and ENTER (40H), the VTR returns the information (year/month/day/hour/ minute/second in sequence) of the specified alarm recording. When 0 is specified for the alarm recording number, the number of the alarm recordings on the list is returned by three bytes.
Example: When 85 alarm recordings are on the list:
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| ENTER |
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RxD |
| DAH |
| C7H |
| 30H |
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| 40H |
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TxD |
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| 0AH |
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| 0AH |
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| 0AH |
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| 30H |
| 38H |
| 35H |
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| ACK |
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| ACK |
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| ACK | 0 | 8 | 5 |
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Example: When alarm recording 37 was recorded on Jan. 31, 1998, 3:10 and 58 seconds, p.m.:
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| ENTER |
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RxD |
| DAH |
| C7H |
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| 33H |
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| 37H |
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| 40H |
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TxD |
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| 0AH |
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| 0AH |
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| 0AH |
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| 0AH |
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| ACK |
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| ACK |
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| ACK |
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| ACK |
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| 39H |
| 38H |
| 30H |
| 31H |
| 33H |
| 31H |
| 31H |
| 35H |
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| 31H |
| 30H |
| 35H |
| 38H |
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| 9 |
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12