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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
(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.)
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
RXD
0AH
0AH
0AH
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).
58
40H
Time
0AH
01H (or 05H)
Search start
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.
5 Recording/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.
Eg: To set to "L24H".
TXD
7EH
30H
33H
40H
0AH
0AH
0AH
RXD
5 Timelapse 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
RXD
0AH
• The setting details for the first to the third bytes are shown below.
1st byte
BIT
When the bit is "1"
0
Repeat recording function ON
1
Unused
2
POWER ON REC mode ON
3
Auto rewind ON
4
Unused
5
Series recording function ON
6
Tape end buzzer ON during recording
7
Alarm recording buzzer ON
3rd byte
BIT
When the bit is "1"
0
Unused
1
Summer time compensation ON
2
Unused
3
Unused
4
Unused
5
Auto record check function ON
6
Unused
7
Unused
Mode
1st byte
2nd byte
3H
30H
30H
L12H
30H
32H
Time
L24H
30H
33H
0AH
24H
31H
36H
48H
30H
34H
72H
30H
35H
120H
30H
37H
168H
30H
38H
240H
30H
39H
1st byte
2nd byte
3rd byte
Time
0AH
0AH
0AH
2nd byte
BIT
When the bit is "1"
0
Unused
1
Alarm recording function ON
2
Unused
3
Sensor recording function ON
4
External recording function ON
5
Unused
6
Unused
7
Warning buzzer ON
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