42
12 RS-232C INTERFACE
Contents of STATUS SENSE
When the STATUS SENSE (D7H) command is sent, the
following data (5 bytes) is returned.
First byte
Bit No.
Status
When the bit is 1
7
Always 1
6
Always 0
5
SHORT FF/REW
During short FF or short REW
4
REC INHIBIT
Recording is inhibited.
3
CASSETTE OUT There is no cassette loaded.
2
SERVO LOCK
Servo is locked.
1
Undefined
Always 0
0
ERROR
An error has occurred.
Second byte
Bit No.
Status
When the bit is 1
7
VIDEO EE
Video output is EE.
6
AUD 1 EE
Audio 1 output is EE.
5
VIDEO MUTE
Always 0
4
AUD 1 MUTE
Always 0
3
WARNING
There is a problem with the
VCR.
2
DEW
Condensation has formed in
the VCR.
1
TAPE BEGIN
Short FF at the tape beginning
0
TAPE END
Short REW at the tape end
Third byte
Bit No. Status
When the bit is 1
7
TIMER PLAY
The [TIMER] switch is set to
“PLAY”.
6
TIMER REC
The [TIMER] switch is set to
“REC”.
5
Unused
Always 0
4
Unused
Always 0
3
Unused
Always 0
2
Unused
Always 0
1
SEARCH MODE
The VCR is in the Search mode
0
Unused
Always 0
Fourth byte
Bit No.
Status
When the bit is 1
7
PLAY MODE
The VCR is playing back a tape.
6
FF MODE
The VCR is fast-forwarding a
tape.
5
REW MODE
The VCR is rewinding a tape.
4
STOP MODE
The VCR is in the Stop mode.
3
STANDBY MODE
The VCR is on standby.
2
EJECT
A cassette is being ejected.
1
REC MODE
The VCR is recording on a tape
0
Unused
Unused
Fifth byte
Bit No.
Status
When the bit is 1
7
PAUSE MODE
The VCR temporarily stops.
6
Unused
Always 0
5
SHUTTLE FWD
The VCR is shuttle-searching
in the forward direction.
4
SHUTTLE REV
The VCR is shuttle-searching
in the reverse direction.
3
SPEED CODE 3
Speed code 3
2
SPEED CODE 2
Speed code 2
1
SPEED CODE 1
Speed code 1
0
SPEED CODE 0
Speed code 0
Search speed table (corresponding speed only)
Search speed
Speed code (bit No.)
3
2
1
0
STILL
0
0
0
0
0.1
0
0
1
0
0.2
0
0
1
1
0.3
0
1
0
0
1
0
1
0
1
2
0
1
1
0
5
0
1
1
1
10
1
0
0
1
43
12 RS-232C INTERFACE
Error-related commands
This command is returned when transmitted data cannot be
received normally by the VCR. A command to release the
error status is also available.
Command
Description
02
ERROR: Returned when the VCR
receives an invalid command after the
second byte of the transmitted command.
In this case, even though commands are
sent continuously, no commands can be
accepted except STATUS SENSE. To
release this error mode, send the
following commands.
41
CLEAR ERROR: Clears the last
transmitted byte. Use this to release the
error mode as well.
56
CLEAR: All commands are canceled.
This is also used to release the error
mode.
0B
NAK: Returned when the VCR receives
an undefined command for the first byte
or a command specifying a function not
available on the VCR. Releasing the
error mode with the CLEAR command is
not necessary. Just send a correct
command.
Contents of JVC STATUS SENSE
When the STATUS SENSE (DDH) command is sent, the
following data (4 bytes) is returned.
First byte
Bit No. Status
When the bit is 1
7
Always 1
6
Always 0
5
Unused
Always 0
4
DMF
Always 0
3
Unused
Always 0
2
JVC TABLE 2
JVC TABLE 2 is effective.
1
JVC TABLE 1
JVC TABLE 1 is effective.
0
LOCAL
The [REMOTE] switch is set to
“LOCAL”.
Second byte
Bit No. Status
When the bit is 1
7
TC GENERATOR The time code generator is in
the TCG mode.
6
USERS BIT
The counter mode is set to the
UB mode.
5
TIME CODE
The counter mode is set to the
TC mode.
4
CTL PULSE
The counter mode is set to the
CTL mode.
3
CTL
Always 0
interpolation
2
DROP FRAME
The current time code is set to
the Drop Frame mode. (U MODEL)
ALWAYS 0 (E MODEL)
1
LTC
Always 0
0
Unused
Third byte
Bit No. Status
When the bit is 1
7
TC REC RUN
The TCG is set to the Rec Run
mode.
6
TC REGEN
The TCG is set to the REGEN
mode.
5
TC EXTERNAL
The TCG is set to the External
mode.
4
TC INSERT
Always 0
LED
3
AUD 2 INSERT
Always 0
LED
2
AUD 1 INSERT
Always 0
LED
1
VIDEO INSERT Always 0
LED
0
ASSEM LED
Assemble mode
Fourth byte
Bit No. Status
When the bit is 1
7
TBC PWB IN
Always 1
6
TC PWB IN
Always 1
5
DA3 INSERT LED
Always 0
4
DA4 INSERT LED
Always 0
3
AUTO MODE
Always 0
2
Unused
Always 0
1
Unused
Always 0
0
Unused
Always 0
* Usage example of CLEAR ERROR
Specify the cue-up point at 1:10:10:25.
As this data cannot be specified for the data following the
CUE UP WITH DATA, correct the data.
TxD
B2
RxD
0A
30
0A
31
0A
31
0A
30
0A
31
0A
30
0A
33
0A
41
0A
32
0A
35
0A
CLEAR ERROR
Mis-input
01
10
10
25
