JVC SR-9090U Command description, This section provides technical data for programmers

9 OPTIONAL SA-K97U RS-232C INTERFACE BOARD

9-3 SA-K97U RS-232C Protocol & Commands

This section provides technical data for programmers.

Command description

To use the commands described in the following pages, prepare the VCR for communications as follows:

Transmit the command “JVC TABLE 1 ON” (F6H) to the VCR. The VCR will return “ACK” (0AH). When the operating mode is turned on, the VCR is in the “ON” status.

The VCR can now receive any command described in this section. To cancel the communications mode, transmit the command “JVC TABLE 1 OFF” (F7H).

1 VCR control commands

Commands (1) through (12) are 1-byte commands. The VCR will return “ACK” (0AH) when the command is received. Confirm that “ACK” (0AH) has been returned before transmitting the next command.

(1)	OPERATE ON (7BH)	: VCR operating mode is turned “ON”.
	OPERATE OFF (7CH)	: VCR operating mode is turned “OFF”.
(2)	PLAY (3AH)	: Playback
(3)	STILL (4FH)	: Pause/Still

9 OPTIONAL SA-K97U RS-232C INTERFACE BOARD

After transmitting the VISS SEARCH command (18), transmit the appropriate 2-byte numeric data (from 30H to 39H), the data input command (40H), and either FF (ABH) or REW (ACH). All commands should be transmitted separately one byte at a time with “ACK” (0AH) confirmation from the VCR after each transmission. * Execute in the Stop mode.

(18) VISS SEARCH (B3H) : To search for a designated alarm-input point on the tape.

The VCR starts search after returning “ACK”. When the specified point is reached, the VCR returns COMPLETION (01H). If the end or beginning of the tape is reached before the specified point, the VCR returns NOT TARGET (05H).

This command differs from commands (16) and (17) only in that the FF (ABH) or REW (ACH) command is included separately.

2 VCR setting commands

Commands available include control of recording/playback mode setting, timelapse VCR operation mode setting, date and time setting, timer programming, on-screen setting, and others.

5Recording/playback mode setting commands

Two commands are available. One allows you to rotate through recording/playback modes, the other permits you to directly select the mode.

(1)MODE SHIFT (7DH) : Switches from one recording/playback mode to the next each time the command is transmitted. Use the TL STATUS SENSE (D6H) command to check the current mode.

	Transmit 1 byte at a time with “ACK” (0AH) confirmation from the VCR after each transmission.
(2) MODE (7EH)	: Sets recording/playback mode directly.
	After transmitting this command, transmit the appropriate 2-byte ASCII codes (from 30H to 39H) and the data
	input command (40H). Correspondence of ASCII codes with recording/playback modes is as shown below.

(4)	STOP (3FH)	: Stop
(5)	FF (ABH)	: FF/Forward search in the Play mode.
(6)	REW (ACH)	: REW/Reverse search in the Play mode.
(7)	REV PLAY (4AH)	: Reverse playback at normal speed
(8)	TIMER ON (60H)	: Timer “ON”
	TIMER OFF (61H)	: Timer “OFF”
(9)	OPE LOCK ON (69H)	: Operation lock “ON”
	OPE LOCK OFF (6AH)	: Operation lock “OFF”
(10)	EJECT (A3H)	: Cassette ejection
		VCR returns “ACK”, and then returns CASSETTE OUT (03H) after cassette has been ejected.
(11)	F-FIELD STEP (ADH)	: Advances the tape by one field when the VCR is in the Still mode and engages the Still mode.
		If the VCR is in any other play mode, the Still mode is engaged.
(12)	R-FIELD STEP (AEH)	: Reverses the tape by one field when the VCR is in the Still mode and engages the Still mode.
		If the VCR is in any other play mode, the Still mode is engaged.
(13)	REC CHECK (C1H)	: Engages REC CHECK. (function is the same as when locally controlled on the VCR.)

Eg: To set to “24H”.

TXD	7EH		31H		36H		40H
RXD		0AH		0AH		0AH		0AH

	Mode	1st byte	2nd byte
	2H	30H	30H
Time	6H	30H	31H
	24H	31H	36H
	48H	30H	34H
	72H	30H	35H
	120H	30H	37H
	168H	30H	38H
	240H	30H	39H
	480H	31H	31H
	960H	31H	33H

Before transmitting either of the following commands ((14) or (15)), first transmit REC/DUB REQUEST (FAH), and confirm that “ACK” (0AH) is returned by the VCR.

(14)	REC (CAH)	: Starts recording. The VCR returns “ACK” (0AH).
		If the cassette tape’s safety tab [REC TAB] has been removed, NAC (0BH) is returned.
		• When REC PAUSE (FAH + CBH) is sent in the Record mode, the Record-Pause mode is
		engaged.
		• When STOP (3FH) is sent in the Record mode, the Stop mode is engaged.
(15)	REC PAUSE (CBH)	: Engages Record-Pause mode. The VCR returns “ACK” (0AH).
		If the cassette tape’s safety tab has been removed, NAC (0BH) is returned.

• To re-start recording, transmit REC (FAH+CAH).

• To cancel Record-Pause, transmit STOP (3FH). The VCR will enter the Stop mode.

After transmitting commands VISS FWD (16) or VISS REV (17), transmit the appropriate numeric data (1-byte ASCII codes from 30H to 39H) and the data input command (40H).

ASCII codes “30H – 39H” correspond with the numbers “0 – 9” (ie.: 0: 30H, 1: 31H, ... 9: 39H).

Each byte of numeric data and the data input command should be transmitted separately with “ACK” (0AH) confirmation from the VCR after each transmission. * Transmit the commands (16) and (17) in the Stop mode.

(16)	VISS FWD (B0H)	: To advance the tape in the forward search mode to the designated alarm-input point. The alarm
		point’s 2-byte numeric data should be input after transmission of this command.
(17)	VISS REV (B1H)	: To reverse the tape in the reverse search mode to the designated alarm-input point. The alarm
		point’s 2-byte numeric data should be input after transmission of this command.

Eg: To search for the 3rd alarm-input point from the current position.

TXD	B0H	30H		33H		40H			Time
RXD	0AH		0AH		0AH	0AH	Search start	01H (or 05H)

The VCR starts search after returning “ACK”. When the specified point is reached, the VCR returns COMPLETION (01H). If the end or beginning of the tape is reached before the specified point, the VCR returns NOT TARGET (05H). (Sending either the 30H,30H or 30H,31H command will cause the VCR to search for the 1st alarm-input point).

5Timelapse VCR operation mode setting commands

(1) TL STATUS SET (86H)	: Set the timelapse VCR operation mode with 3-byte data. Send one byte at a time by checking
	ACK (0AH) from the VCR.
		TXD
			86H		1st byte		2nd byte		3rd byte		Time
		RXD		0AH		0AH		0AH		0AH

•The setting details for the first to the third bytes are shown below.

1st byte			2nd byte
	BIT	When the bit is “1”		BIT	When the bit is “1”
0		Repeat recording function ON	0		Unused
1		Unused	1		Alarm recording function ON
2		POWER ON REC mode ON	2		Unused
3		Auto rewind ON	3		Sensor recording function ON
4		Unused	4		External recording function ON
5		Series recording function ON	5		Unused
6		Tape end buzzer ON during recording	6		Unused
7		Alarm recording buzzer ON	7		Warning buzzer ON
3rd byte
	BIT	When the bit is “1”
0		Unused
1		Summer time compensation ON
2		Unused
3		Unused
4		HDR mode ON
5		Auto record check function ON
6		Unused
7		Unused

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