JVC BR-D95U specifications 0A ACK, 0B NAK

13 RS-232C protocol

13-2 RS-232C Commands

RS-232C specifications 9PIN D-SUB

1

5

6

9

PIN No.

Signal

Operation

Direction

2

RxD

Reception data

VCR p CPU

3

TxD

Transmission data

VCR [ CPU

4

DTR

Data terminal ready

VCR [ CPU

5

GND

Signal ground

6

DSR

Data set ready

VCR p CPU

Note: CPU means a controller such as a personal

computer.

Mode

:

Non-synchronized

Character length

:

8 bits

Parity check

:

None

Start bit

:

1

Stop bit

:

1

Data rate

:

9600 bps

Bit construction

p

D0

D1

D2

D3

D4

D5

D6

D7

p

Start bit

Stop bit

Basic format

(1)The VCR returns [0A: ACK]·[0B: NAK]·[02:Error] in response to each byte sent from the controller. Eg.: E5: EditPreset

CPU E5		3*	3*
VTR	0A	0A	0A
CPU: Controller such as a personal computer
VCR: BR-D95 series

•In response to the first byte sent from the controller, the VCR returns either [ACK], [NAK] or [Error] within 100 µs.

•The controller confirms the reply from the VCR and then outputs the second byte. The VCR returns either [ACK], [NAK] or [Error] within 100 µs.

•The controller confirms the reply from the VCR and then outputs the third byte. The VCR returns either [ACK], [NAK] or [Error] within 100 µs.

(2)When the data is recognized by the controller, the VCR returns the standard byte data.

Eg.: D7: StatusSense

	CPU	D7
	VTR	**	**	**	**	**
	CPU: Controller such as a personal computer
	VCR: BR-D95 series
•	The VCR starts to output data within 100 µs
	after receiving the first byte from the controller.
	Stop bits are inserted between output data.

Receiving

•The VCR always receives commands from the controller. The VCR also replies to all “sense” commands such as StatusSense/TimeSense.

•Switch Remote/Local on this unit to “Remote”.

Time management

Command output timing is managed as follows:

•The minimum command interval is 10 ms.

•The minimum byte interval is 100 µs when the controller outputs the next byte without confirming the [ACK], [NAK] or [Error] returned from the VCR.

Processing method when an error occurs

(1)When NAK (0B) is returned

The first byte command that the VCR was unable to receive is sent. Output another command.

(2)When Error (02) is returned <The Error section of StatusSense (bit-0 of the first byte) describes the Error mode.>

•The VCR receives an illegal command for the second byte and later. With ClearError [41], the previous byte is canceled.

•When ClearError [41] is transmitted repeatedly because Error [02] is returned more than once, ACK [0A] is returned to release the Error mode. The Error mode can also be released by canceling the commands being input with Clear [56].

(3)If ACK [0A], NAK [0B], Error [02] or Data is not returned

The VCR does not recognize the byte. Cancel the commands being input with Clear [56] and transmit the command again.

(The VCR replies within 1 ms after receiving the command from the controller.)

(4)When NotTarget [05] is returned

The target point on the tape specified with CueUpWith Data/Preroll does not exist. Input a different value and try again.

13 RS-232C protocol

13-2 RS-232C Commands

Return command from the VCR

01: Completion			Basic/JVC-1 Table
	The VCR outputs this command after completing
	the requested operation (CueUp With Data/Preroll/
	AutoEdit, etc.).
02: Error			Basic/JVC-1 Table
	The VCR outputs this command when invalid data
	is received.Bit-0 (Error) of the first byte is set for
	[D7: StatusSense].
	In this condition, the VCR will not accept any
	command except the StatusSense command.
	The Error mode can be released with [41:
	ClearError] or [56: Clear].
	To cancel the entire command, use [56: Clear]. To
	cancel only the most recently transmitted data,
	use [41: ClearError].
03: Cassette Out			Basic/JVC-1 Table
	The VCR outputs this command when the eject
	operation is complete.
05: Not Target			Basic/JVC-1 Table
	The VCR outputs this command when CueUp
	With Data/Preroll operation cannot be completed
	normally.
0A: ACK			Basic/JVC-1 Table
	This command is returned when the defined
	command is received.
0B: NAK			Basic/JVC-1 Table
	This command is returned when an undefined or
	invalid command is received.
ASCII code			Basic/JVC-1 Table
	Alphanumeric equivalents for certain “Sense”
	commands.
	30: Zero	61: a	6B: k	75: u
31: 1		62: b	6C: l	76: v
32: 2		63: c	6D: m	77: w
	33: 3	64: d	6E: n	78: x
	34: 4	65: e	6F: o	79: y
	35: 5	66: f	70: p	7A: z
36: 6		67: g	71: q	20: Space
37: 7		68: h	72: r	2D: -
	38: 8	69: i	73: s
39: 9		6A: j	74: t

Auxiliary commands to the VCR

40: Enter				Basic/JVC-1 Table
	If this command is transmitted during data trans-
	mission, data transmitted after this command will
	be zero (=30) or space (=20). More information
	on how to use this command can be found in the
	descriptions of related commands where its use is
	valid.
41: Clear Error				Basic/JVC-1 Table
	In the Error mode, this command cancels the last
	numeric/data command.
	The Error mode is engaged when bit-0 (Error) of
	the first byte in D7: StatusSense is “1”.
56: Clear				Basic/JVC-1 Table
	In the Error mode, this command releases the
	command.
	TxD	56
	RxD		0A
	The Error mode is engaged when bit-0 (Error) of
	the first byte in D7: StatusSense is “1”.
ASCII code				Basic/JVC-1 Table
	Alphanumeric equivalents for certain Preset
	commands.
	30: Zero		61: a	6B: k	75: u
31: 1			62: b	6C: l	76: v
32: 2			63: c	6D: m	77: w
	33: 3		64: d	6E: n	78: x
	34: 4		65: e	6F: o	79: y
35: 5			66: f	70: p	7A: z
36: 6			67: g	71: q	20: Space
37: 7			68: h	72: r	2D: -
	38: 8		69: i	73: s
39: 9			6A: j	74: t

Corresponding commands

3A: Play key	Basic/JVC-1 Table
Playback
TxD	3A
RxD	0A
3B: Fwd-4 Key		Basic Table
4x playback in the forward direction
TxD	3B
RxD	0A
3C: Fwd-0.09 Key		Basic Table
0.09x playback in the forward direction
TxD	3C
RxD	0A
3D: Fwd Still Key		Basic Table
Still playback
TxD	3D
RxD	0A
3E: Fwd-6 Key		Basic Table
6x playback in the forward direction
TxD	3E
RxD	0A

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