Tascam CD-A750 User manual

TASCAM CD-A750
CONTROL I/O RS-232C connector
RS-232C Protocol Specification
Ver.1.00
May 2009
TEAC Corporation

TASCAM CD-A750 RS-232C Protocol Specifications
2TEAC Corporation
IMPORTANT:
PLEASE CAREFULLY READ THE LICENSE AGREEMENT HEREIN BEFORE USING THE
PROTOCOL INFORMATION WRITTEN IN CHAMETER 9 “RS-232C INTERFACE” OF “DV-D01U DVD
PLAYER USER’S MANUAL”. THE RIGHT TO USE THE PROTOCOL INFORMATION IS GRANTED
ONLY ON THE CONDITION THAT YOU AGREE TO THE LICENSE AGREEMENT. IF YOU DO NOT
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NOTE THAT ANY BREACH OF THE CONDITIONS MAY RESULT IN SUSPENSION OF USE AND/OR
CLAIM OF DAMEGES.
PROTOCOL INFORMARTION LICENSE AGREEMENT
1. This License Agreement with limited warranty shall apply to you when you start to use the protocol
information.
2. TEAC grants to you the right to use the protocol information only to develop equipment which
communicates control signals with CD-A750 through RS-232C port. The license granted hereby shall be
non-exclusive, non-transferable.
3. Except as and only to the extent expressly permitted in this License, the disclosure of the protocol
information shall not imply any right, title or interest relating to the protocol information and/or protocol
itself. You agree that this protocol information is a writing belonging to TEAC and protected under
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does not warrant that this protocol information and the protocol will be effective for your particular
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ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.

TASCAM CD-A750 RS-232C Protocol Specifications
3TEAC Corporation
1. Overview
The CD-A750 can be controlled by computer or external device via RS-232C connector on the rear panel
with the RS-232C serial protocol. In this document, the CD-A750 is referred to as the "controlled device,"
and the external device that controls it is referred to as the "external controller."
2. Specifications
Electrical specifications
Conforms to standard JIS X-5101 (equivalent to former JIS C-6361 and EIA RS-232C)
(Not compatible with the RS-422A used in professional VTR units)
Impedance at receiver Measured with an applied voltage of between ±3 and 15V, the DC
resistance is between 3KΩand 7KΩ.
Total load capacitance is less than 2500pF
Open circuit voltage at transmitter Less than 25V
Open circuit voltage at receiver Less than 2V
Signal voltage Open circuit voltage at the receiver is 0V, the signal voltage is
between ±5V and ±15V for a load impedance of between 3K and
7KΩ.
Signal discrimination Logical “1” Less than -3V
Logical “0” More than +3V
Communication format
Circuit type 3-wire, half-duplex
Transmission type Digital binary serial
Data speed (baud rate) 4800/9600/19200/38400 bit/sec
Character length 7/8 bit
Parity bit Odd/Even/None
Stop bit 1/2 bit
(Data speed, character length, parity bit, and stop bit settings are made on the controlled device.)
Connector pin-out
Connector D-sub 9-pin female (unified screw thread)
Terminal pin-out and input/output signals
Pin no. In/Out Signal name Description
1 - NC Not connected
2 In Rx Data Data received at this pin *1
3 Out Tx Data Data transmitted from this pin
4 Out (Reserved) Reserved
5 - GND Ground
6 In (Reserved) Reserved
7 Out RTS Request To Send (output "request to transmit") *2
8 In CTS Clear To Send (input "ready to receive") *2
9 - NC Not connected
*1：A voltage that satisfies the RS-232C specification must be applied to Rx Data.
*2：RTS/CTS is loopback-connected within the controlled device. If using RTS/CTS control, consider the
design of the external controller.

TASCAM CD-A750 RS-232C Protocol Specifications
4TEAC Corporation
2
3
5
RXD
TXD
RTS
CTS
GND
RXD
TXD
RTS
CTS
GND
7
8
Controlled device (CD-A750) External controller

TASCAM CD-A750 RS-232C Protocol Specifications
5TEAC Corporation
3. Command format
Command format overview
Byte 1 Byte 2 Byte 3 Byte 4 Byte 5 Byte 6 Byte 7 Byte 8 … Byte n
LF ID Command Data 1 Data 2 Data 3 Data 4 … CR
Commands begin with a "line feed (LF)," end with a "carriage return (CR)".
The following byte of “LF” is machine ID.
In the case of CD-A750, “0” (30H) means CD and “1” (31H) means Cassette deck.
The machine ID for common function is either “0” or “1”
Commands are composed by two ASCII bytes.
The following bytes of the command are the data bytes.
The number of data bytes depends on the command.
For details on the data, refer to the detailed explanation for each command. For commands that use 0--9 and
A--F as data values, uppercase characters are used for A--F.
Example commands
Example 1: PLAY command for the CD
When the controlled device is in Stop or Ready mode, this command starts playback of the CD on the
controlled device.
The PLAY command is [12].
ID Command
ASCII LF 0 1 2 CR
HEX 0Ah 30h 31h 32h 0Dh
Example 2: Direct search for track 123 on the CD
Use "DIRECT TRACK SEARCH PRESET [23]" command.
The data bytes consist of ASCII in two-byte units.
For the "DIRECT TRACK SEARCH PRESET" command, the track number is specified as follows.
Data 1 Tens digit of the specified track number
Data 2 Ones digit of the specified track number
Data 3 Thousands digit of the specified track number
Data 4 Hundreds digit of the specified track number
Thus, the transmitted command will be as follows.
ID Command Data：track 123
ASCII LF 0 2 3 2 3 0 1 CR
HEX 0Ah 30h 32h 33h 32h 33h 30h 31h 0Dh
Example 3: FORWARD PLAY command for the Cassette
When the controlled device is in Stop or Ready mode, this command starts playback of the cassette
deck on the controlled device.
The PLAY command is [12].
ID Command
ASCII LF 1 1 1 CR
HEX 0Ah 31h 31h 31h 0Dh

TASCAM CD-A750 RS-232C Protocol Specifications
6TEAC Corporation
List of commands
CD Player section (Machine ID=”0”)
Control/Preset/Sense Command Return Command
88 TIME DATA
10 STOP
11 PLAY
12 PLAY
14 READY
16 SHUTTLE
18 EJECT
1A TRACK SKIP
1D CALL
20 AUTO CUE LEVEL PRESET A0 AUTO CUE LEVEL RETURN
23 DIRECT TRACK SEARCH PRESET
2C TIME SEARCH PRESET
30 AUTO CUE SELECT B0 AUTO CUE SELECT RETURN
32 EOM TRACK TIME SELECT B2 EOM TRACK TIME RETURN
34 RESUME PLAY SELECT B4 TIMER/RESUME PLAY SELECT
RETURN
35 PITCH CONTROL SELECT B5 PITCH CONTROL SELECT RETURN
36 AUTO READY SELECT B6 AUTO READY SELECT RETURN
37 REPEAT SELECT B7 REPEAT SELECT RETURN
3A INCR PLAY SELECT BA INCR PLAY SELECT RETURN
3B AUTO SPACE SELECT BB AUTO SPACE SELECT RETURN
3F TIME DATA SEND SELECT BF TIME DATA SEND SELECT RETURN
4D PLAY MODE SELECT
4E PLAY MODE SENSE CE PLAY MODE RETURN
50 MECHA STATUS SENSE D0 MECHA STATUS RETURN
55 TRACK No. SENSE D5 TRACK No. STATUS RETURN
56 MEDIA STATUS SENSE D6 MEDIA STATUS RETURN
57 CURRENT TRACK INFORMATION
SENSE
D7 CURRENT TRACK INFORMATION
RETURN
58 CURRENT TRACK TIME SENSE D8 CURRENT TRACK TIME RETURN
59 TITLE SENSE D9 TITLE RETURN
5D TOTAL TRACK No./TOTAL TIME SENSE DD TOTAL TRACK No./TOTAL TIME
RETURN
5E PGM TOTAL TRACK No./TOTAL TIME
SENSE
DE PGM TOTAL TRACK No./TOTAL TIME
RETURN

TASCAM CD-A750 RS-232C Protocol Specifications
7TEAC Corporation
Cassette Deck section (Machine ID = “1”)
Control/Preset/Sense Command Return Command
10 STOP
11 FORWARD PLAY
12 REVERSE PLAY
13 RECORD
1A F.FWD/REW
1B REC MUTE
1C PAUSE
2D RTZ
50 MECHA STATUS SENSE D0 MECHA STATUS RETURN
56 MEDIA STATUS SENSE D6 MEDIA STATUS RETURN
5A COUNTER SENSE DA COUNTER RETURN
65 COUNTER RESET
Common Functions (Machine ID = “0” or “1”)
Control/Preset/Sense Command Return Command
0F INFORMATION REQUEST 8F INFORMATION RETURN
4C REMOTE/LOCAL SELECT CC REMOTE/LOCAL SELECT RETURN
F0 ERROR SENSE REQUEST
F2 ILLEGAL STATUS
F4 POWER ON STATUS
F6 CHANGE STATUS
78 ERROR SENSE F8 ERROR SENSE RETURN

TASCAM CD-A750 RS-232C Protocol Specifications
8TEAC Corporation
Command sequence
In most cases the controlled device will not send an ACK in response to transport control or data preset
commands sent from the external controller.
The controlled device will send back a return command in response to data sense commands that
request a data value specified on the controlled device.
When the status of the controlled device changes, such as from Stop to Play mode, or when an error etc.
occurs, the controlled device will send a command indicating this to the external controller.
Examples of the command sequence are given below.
You must leave an interval of at least 20 ms between commands.
Example 1: Controlling the transport of the controlled device
This example describes the Play operation.
When the controlled device receives the PLAY command and enters Play mode, it will transmit
a CHANGED STATUS command.
ACK is not transmitted for the PLAY command.
Command
External controller Controlled device State of controlled device
Stopped
PLAY ->
<- CHANGED STATUS Transmit when starting Play
Example 2: Presetting data
This example describes setting the AUTO CUE LEVEL.
When the controlled device receives the AUTO CUE LEVEL PRESET (Preset) command, it will
set its AUTO CUE LEVEL.
ACK is not transmitted for this command.
Command
External controller Controlled device State of controlled device
AUTO CUE LEVEL
PRESET (Preset -54dB) -> AUTO CUE LEVEL set to
-54dB
Example 3: Obtaining specified data
This example describes obtaining the currently-set AUTO CUE LEVEL.
When the controlled device receives the AUTO CUE LEVEL PRESET (Sense) command, it will
return the currently-set AUTO CUE LEVEL.
Command
External controller Controlled device State of controlled device
AUTO CUE LEVEL
PRESET (Sense) ->
<- AUTO CUE LEVEL
RETURN

TASCAM CD-A750 RS-232C Protocol Specifications
9TEAC Corporation
Example 4: Checking the status of the controlled device, and performing the next operation
When the operating status of the controlled device changes, it will transmit CHANGED
STATUS. By using CHANGED STATUS as a trigger for sending MECHA STATUS SENSE, the
new operating status can be determined.
This example shows how to check the record-ready status of the controlled device and then
initiate recording.
Command
External controller Controlled device State of controlled device
Stopped
RECORD (Record Ready) ->
<- CHANGED STATUS Transmitted when entering
record-ready status
MECHA STATUS SENSE ->
<- MECHA STATUS
RETURN
Returns record-ready status
RECORD (Record) ->
<- CHANGES STATUS Transmitted when entering
record status

TASCAM CD-A750 RS-232C Protocol Specifications
10 TEAC Corporation
Command details
The commands, data, and machine IDs described here are characters (ASCII).
A command is two character bytes, a machine ID is one character byte, and each item of data is an
individual character byte.
The CD-A750 can use the following track numbers. However if a number not existing on the disc is
specified, it will be considered an invalid command.
Track number (audio CD) maximum 99
Track number (MP3 CD) maximum 999
CD functions
STOP
Stops the CD player of the controlled device.
Command 10
Machine ID 0
Data none
Return none
PLAY
Play starts the CD player of the controlled device.
Command 11 & 12
Machine ID 0
Data none
Return none
READY
Puts the CD player of the controlled device into the PLAY-READY mode.
Command 14
Machine ID 0
Data 2 bytes
Data 1 Data 2 Description Remarks
0 0 Ready Off
0 1 Ready On
・ If data other than the above is received, the controlled device will transmit ILLEGAL [F2].
Return none
SHUTTLE
Puts the CD player of the controlled device in SHUTTLE mode.
SHUTTLE mode will be maintained until a command such as STOP, PLAY, or READY is received.
Command 16
Machine ID 0
Data 2 bytes
Data 1 Data 2 Description Remarks
0 0 Shuttle
Forward
Shuttles in the forward direction.
0 1 Shuttle
Reverse
Shuttles in the backward direction.
・ If data other than the above is received, the controlled device will transmit ILLEGAL [F2].
Return none
TRAY/EJECT
Opens or closes the tray of the CD player of the controlled device

TASCAM CD-A750 RS-232C Protocol Specifications
11 TEAC Corporation
Command 18
Machine ID 0
Data none
Return none
TRACK SKIP
Causes the CD player of the controlled device to skip tracks.
After skipping, the device will maintain the mode in which it was when the operation began.
Command 1A
Machine ID 0
Data 2 bytes
Data 1 Data 2 Description Remarks
0 0 Track Skip Next Skips to the next track.
0 1 Track Skip
Previous
If the current position is at the beginning of a track,
skips to the beginning of the previous track. If the
current position is not at the beginning of a track, skips
to the beginning of the current track..
・ If data other than the above is received, the controlled device will transmit ILLEGAL [F2].
Return none
CALL
Causes the controlled device to locate to the call point and enter playback-ready mode.
Command 1D
Machine ID 0
Data none
Return none
AUTO CUE LEVEL PRESET
Sets the Auto Cue Level of CD player of the controlled device.
A return command is returned only if Sense [FF] is specified.
The Auto Cue Mode setting is made using the command "AUTO CUE SELECT [30]."
Command 20
Machine ID 0
Data 2 bytes
Data 1 Data 2 Description Remarks
0 0 Preset –24dB
0 1 Preset –30dB
0 2 Preset –36dB
0 3 Preset –42dB
0 4 Preset –48dB
F F Sense Requests that the current preset level to be returned.
・ If data other than the above is received, the controlled device will transmit ILLEGAL [F2].
Return AUTO CUE LEVEL RETURN [A0]
DIRECT TRACK SEARCH PRESET
Searches for the specified track number.
When this command is received while in PLAY mode, the CD player of the controlled device will
enter PLAY mode after searching. If the CD player of the controlled device had been in any other
mode when searching began, it will be in play ready mode after searching.
Command 23
Machine ID 0
Data 4 bytes
Description Remarks
Data 1 Tens digit of the track number Track number

TASCAM CD-A750 RS-232C Protocol Specifications
12 TEAC Corporation
Data 2 Ones digit of the track number
Data 3 Thousands digit of the track number
Data 4 Hundreds digit of the track number
Example) 2301: track 123
・ If the specified track number does not exist on the disc, the controlled device will transmit
ILLEGAL [F2].
Return none
TIME SEARCH PRESET
Searches for the specified track number and time.
If this command is received while in PLAY mode, the device will enter PLAY mode following the
search. If the device was in any other mode, it will be in play ready mode following the search.
Command 2C
Machine ID 0
Data 12 bytes
Description Remarks
Data 1 Tens digit of track number
Data 2 Ones digit of track number
Data 3 Thousands digit of track number
Data 4 Hundreds digit of track number
Data 5 Tens digit of minutes
Data 6 Ones digit of minutes
Data 7 Thousands digit of minutes
Data 8 Hundreds digit of minutes
Data 9 Tens digit of seconds
Data 10 Ones digit of seconds
Data 11 0 Set to 0
Data 12 0 Set to 0
・ If a track number not existing on the disc is specified, the controlled device will transmit
ILLEGAL [F2].
・ If data outside the operating range is received, the controlled device will transmit ILLEGAL
[F2].
Return none
AUTO CUE SELECT
Specifies the auto cue mode setting of the CD player of the controlled device.
A return command is returned only if Sense [FF] is specified.
The AUTO CUE LEVEL setting is made by the command "AUTO CUE LEVEL PRESET [20]."
Command 30
Machine ID 0
Data 2 bytes
Data 1 Data 2 Description Remarks
0 0 Auto Cue Off
0 1 Auto Cue On
F F Sense Requests that the preset content be returned.
・ If data other than the above is received, the controlled device will transmit ILLEGAL [F2].
Return AUTO CUE SELECT RETURN [B0]
EOM TRACK TIME PRESET
Specifies the time at which the tally signal will be output by the EOM (End Of Message) function
which outputs a tally signal when the track nears its end.
A return command is returned only if data [FF] is specified.
Command 32
Machine ID 0

TASCAM CD-A750 RS-232C Protocol Specifications
13 TEAC Corporation
Data 2 bytes
Data 1 Data 2 Description Remarks
0 0 EOM Track Off
0 5 5 seconds
1 0 10 seconds
1 5 15 seconds
2 0 20 seconds
2 5 25seconds
3 0 30 seconds
3 5 35seconds
F F Sense Requests that the preset content be returned.
・ If data outside the range specified above is received, the controlled device will transmit
ILLEGAL[F2].
Return EOM TRACK TIME RETURN [B2]
RESUME PLAY SELECT
Specifies the resume play mode setting of the CD player of the controlled device.
A return command is returned only if Sense [FF] is specified.
Command 34
Machine ID 0
Data 2 bytes
Data 1 Data 2 Description Remarks
0 0 Resume Play Off
0 2 Resume Play On
F F Sense Requests that the preset content be returned.
・ If data other than the above is received, the controlled device will transmit ILLEGAL [F2].
Return TIMER/RESUME PLAY SELECT RETURN [B4]
PITCH CONTROL SELECT
Specifies the Pitch Control mode of the CD player of the controlled device.
A return command is returned only if Sens [FF] is specified.
Command 35
Machine ID 0
Data 2 bytes
Data 1 Data 2 Description Remarks
0 0 Pitch Control Off
0 1 Pitch Control On
F F Sense Requests that the preset content be returned.
・ If data other than the above is received, the controlled device will transmit ILLEGAL [F2].
Return PITCH CONTROL SELECT RETURN [B5]
AUTO READY SELECT
Specifies the Auto Ready mode setting of the CD player of the controlled device.
A return command is returned only if Sense [FF] is specified.
Command 36
Machine ID 0
Data 2 bytes
Data 1 Data 2 Description Remarks
0 0 Auto Ready Off
0 1 Auto Ready On
F F Sense Requests that the preset content be returned.
・ If data other than the above is received, the controlled device will transmit ILLEGAL [F2].
Return AUTO READY SELECT RETURN [B6]

TASCAM CD-A750 RS-232C Protocol Specifications
14 TEAC Corporation
REPEAT SELECT
Specifies the Repeat Mode setting of the CD player of the controlled device.
A return command is returned only if Sense [FF] is specified.
Command 37
Machine ID 0
Data 2 bytes
Data 1 Data 2 Description Remarks
0 0 Repeat Off
0 1 Repeat On
F F Sense Requests that the preset content be returned.
・ If data other than the above is received, the controlled device will transmit ILLEGAL [F2].
Return REPEAT SELECT RETURN [B7]
INCR PLAY SELECT
Specifies the Incremental Play Mode of the CD player of the controlled device.
A return command is returned only if Sense [FF] is specified.
Command 3A
Machine ID 0
Data 2 bytes
Data 1 Data 2 Description Remarks
0 0 INCR Play Off
0 1 INCR Play On
F F Sense Requests that the preset content be returned.
・ If data other than the above is received, the controlled device will transmit ILLEGAL [F2].
Return INCR PLAY SELECT RETURN [BA]
AUTO SPACE SELECT
Specifies the Auto Space Mode of the CD player of the controlled device.
A return command is returned only if Sense [FF] is specified.
Command 3B
Machine ID 0
Data 2 bytes
Data 1 Data 2 Description Remarks
0 0 Auto Space Off
0 1 Auto Space On
F F Sense Requests that the preset content be returned.
・ If data other than the above is received, the controlled device will transmit ILLEGAL [F2].
Return AUTO SPACE SELECT RETURN [BB]
TIME DATA SEND SELECT
Specifies the output time mode of the CD player of the controlled device.
A return command is returned only if Sense [FF] is specified.
Command 3F
Machine ID 0
Data 2 bytes
Data 1 Data 2 Description Remarks
0 0 Off
0 1 Elapsed time send With frame data
0 2 Remain time send With frame data
0 4 Total remain time send With frame data
1 1 Elapsed time send Without frame data
1 2 Remain time send Without frame data

TASCAM CD-A750 RS-232C Protocol Specifications
15 TEAC Corporation
1 4 Total remain time send Without frame data
F F Sense Requests that the preset content be returned.
・ If data other than the above is received, the controlled device will transmit ILLEGAL [F2].
・ Except for the CD-DA disc, only [11] Elapsed time send is available
Return TIME DATA SEND SELECT RETURN [BF]
PLAY MODE SENSE
Requests that the status of the CD player of the controlled device's Play mode be returned.
Command 4E
Machine ID 0
Data none
Return PLAY MODE RETURN [CE]
MECHA STATUS SENSE
Requests that the status of the CD player of the controlled device's mechanism be returned.
Command 50
Machine ID 0
Data none
Return MECHA STATUS RETURN [D0]
TRACK No. SENSE
Requests that the current track number be returned.
Command 55
Machine ID 0
Data none
Return TRACK No. RETURN [D5]
DISC STATUS SENSE
Requests that the presence or absence of a disc and the type of disc be returned.
Command 56
Machine ID 0
Data none
Return DISC STATUS RETURN [D6]
CURRENT TRACK INFORMATION SENSE
Requests that information for the current track be returned.
Command 57
Machine ID 0
Data none
Return CURRENT TRACK INFORMATION RETURN [D7]
CURRENT TRACK TIME SENSE
Requests that the time information for the current track be returned in the specified form.
Command 58
Machine ID 0
Data 2 bytes
Data 1 Data 2 Description Remarks
0 0 Elapsed Time Elapsed track time
0 1 Remain Time Remaining track time
0 3 Total Remain Time Remaining disc time
・ If data other than the above is received, the controlled device will transmit ILLEGAL [F2].
Return CURRENT TRACK TIME RETURN [D8]

TASCAM CD-A750 RS-232C Protocol Specifications
16 TEAC Corporation
TEXT SENSE
Requests that the title of the current track be returned.
Command 59
Machine ID 0
Data 2 bytes
Data 1 Data 2 Description Remarks
0 0
・ If a track number not existing on the disc is specified, the controlled device will transmit
ILLEGAL [F2].
Return TEXT RETURN [D9]
TOTAL TRACK No./TOTAL TIME SENSE
Requests that the total number of tracks on the disc and the total time be returned.
Command 5D
Machine ID 0
Data none
Return TOTAL TRACK No./TOTAL TIME RETURN [DD]
PGM TOTAL TRACK No./TOTAL TIME SENSE
Requests that the total number of tracks for program playback and the total time be returned.
Command 5E
Machine ID 0
Data none
Return PGM TOTAL TRACK No./TOTAL TIME RETURN [DE]
TIME DATA
This is the return command for the command "TIME DATA SEND SELECT [3F]".
It returns the total number of tracks and the total time of the disc.
Command 88
Machine ID 0
Data 8 or 6 bytes
Description Remarks
Data 1 Tens digit of minutes
Data 2 Ones digit of the minutes
Data 3 Thousands digit of the minutes
Data 4 Hundreds digit of the minutes
Data 5 Tens digit of the seconds
Data 6 Ones digit of the seconds
Data 7 Tens digit of the frames
Data 8 Ones digit of the frames
・ The cycle of the command output depends on the controlled device.
・ The frame data output can be set on or off.
Request/Preset TIME DATA SEND SELECT [3F]
AUTO CUE LEVEL RETURN
This is the return command in response to the command "AUTO CUE LEVEL PRESET [20]".
It returns the currently specified auto cue level.
Command A0
Machine ID 0
Data 2 bytes
Data 1 Data 2 Description Remarks
0 0 –24dB
0 1 –30dB

TASCAM CD-A750 RS-232C Protocol Specifications
17 TEAC Corporation
0 2 –36dB
0 3 –42dB
0 4 –48dB
Request/Preset AUTO CUE LEVEL PRESET [20]
AUTO CUE SELECT RETURN
This is the return command in response to the command "AUTO CUE SELECT [30]".
It returns the Auto Cue on/off status.
Command B0
Machine ID 0
Data 2 bytes
Data 1 Data 2 Description Remarks
0 0 Auto Cue Off
0 1 Auto Cue On
Request/Preset AUTO CUE SELECT [30]
EOM TRACK TIME RETURN
This is the return command in response to the command "EOM TRACK TIME PRESET [32]".
It returns the time at which the EOM (End Of Message) function will give notice that the end of the
track is near.
Command B2
Machine ID 0
Data 2 bytes
Data 1 Data 2 Description Remarks
0 0 EOM Track Off
N1 N2 Number of seconds N1: Tens digit of seconds, N2: Ones digit of seconds
Request/Preset EOM TRACK TIME PRESET [32]
TIMER/RESUME PLAY SELECT RETURN
This is the return command in response to the command "TIMER/RESUME PLAY SELECT [34]".
It returns the status of the Timer play setting and Resume play mode.
Command B4
Machine ID 0
Data 2 bytes
Data 1 Data 2 Description Remarks
0 0 Timer Play: Off / Resume Play: Off
0 1 Timer Play: On / Resume Play: Off
0 2 Timer Play: Off / Resume Play: On
0 3 Timer Play: On / Resume Play: On
Request/Preset TIMER/RESUME PLAY SELECT [34]
PITCH CONTROL SELECT RETURN
This is the return command for the command "PITCH CONTROL SELECT [35]".
It returns the Pitch Control on/off status.
Command B5
Machine ID 0
Data 2 bytes
Data 1 Data 2 Description Remarks
0 0 Pitch Control Off
0 1 Pitch Control On
Request/Preset PITCH CONTROL SELECT [35]

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AUTO READY SELECT RETURN
This is the return command for the command "AUTO READY SELECT [36]".
It returns the Auto Ready on/off status.
Command B6
Machine ID 0
Data 2 bytes
Data 1 Data 2 Description Remarks
0 0 Auto Ready Off
0 1 Auto Ready On
Request/Preset AUTO READY SELECT [36]
REPEAT SELECT RETURN
This is the return command for the command "REPEAT SELECT [37]".
It returns the Repeat Mode on/off status.
Command B7
Machine ID 0
Data 2 bytes
Data 1 Data 2 Description Remarks
0 0 Repeat Off
0 1 Repeat On
Request/Preset REPEAT SELECT [37]
INCR PLAY SELECT RETURN
This is the return command for the command "INCR PLAYSYNC SELECT [3A]".
It returns the Incremental Play on/off status.
Command BA
Machine ID 0
Data 2 bytes
Data 1 Data 2 Description Remarks
0 0 INCR Play Off
0 1 INCR Play On
Request/Preset INCR PLAY SELECT [3A]
AUTO SPACE SELECT RETURN
This is the return command for the command "AUTO SPACE SELECT [3B]".
It returns the Auto Space on/off status.
Command BB
Machine ID 0
Data 2 bytes
Data 1 Data 2 Description Remarks
0 0 Auto Space Off
0 1 Auto Space On
Request/Preset AUTO SPACE SELECT [3B]
TIME DATA SEND SELECT RETURN
This is the return command for the command "TIME DATA SEND SELECT [3F]".
It returns the Time Data format.
Command BF
Machine ID 0
Data 2 bytes
Data 1 Data 2 Description Remarks
0 0 Off
0 1 Elapsed Time Send With Frame data

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0 2 Remain Time Send With Frame data
0 4 Total Remain Time Send With Frame data
1 1 Elapsed Time Send Without Frame data
1 2 Remain Time Send Without Frame data
1 4 Total Remain Time Send Without Frame data
Request/Preset TIME DATA SEND SELECT [3F]
PLAY MODE RETURN
This is the return command for the command "PLAY MODE SENSE [4E]".
It returns the current Play mode.
Command CE
Machine ID 0
Data 2 bytes
Data 1 Data 2 Description Remarks
0 0 Continue Play all tracks on the disc
0 1 Single Play a single track
0 3 Within A-B A-B repeat play mode
0 4 Program (Data Empty) Program Play mode (with no tracks programmed)
0 5 Program Program Play mode
0 6 Random Random Play mode
Request/Preset PLAY MODE SENSE [4E]
MECHA STATUS RETURN
This is the return command for the command "MECHA STATUS SENSE [50]".
It returns the current operating status of the mechanism.
Command D0
Machine ID 0
Data 2 bytes
Data 1 Data 2 Description Remarks
0 0 No Disc No disc is inserted
0 1 Tray/Eject Tray is being opened or closed
0 2 Open Tray is open
1 0 Stop Stopped
1 1 Play Playing
1 2 Ready On Play-ready mode
F F Other than above
Request/Preset MECHA STATUS SENSE [50]
TRACK No. RETURN
This is the return command for the command "TRACK No. SENSE [55]".
It returns whether the current track number and EOM are shown.
If Group mode is on, the group number is returned.
Command D5
Machine ID 0
Data 6 bytes
Description Remarks
Data 1
Data 2 EOM Status 00: EOM indication not shown
01: EOM is displayed
Data 3 Tens digit 0000 Stopped, and track is not cued, etc.
Data 4 Ones digit 0001 – 0999 Track number
Data 5 Thousands digit
Data 6 Hundreds digit
Request/Preset TRACK No. SENSE [55]

TASCAM CD-A750 RS-232C Protocol Specifications
20 TEAC Corporation
MEDIA STATUS RETURN
This is the return command for the command "MEDIA STATUS SENSE [56]".
It returns the presence/absence of a disc, and the type of disc.
Command D6
Machine ID 0
Data 4 bytes
Data 1
Data 2 Media Status 00: Media not present
01: Media present
Data 3
Data 4 Media Type
00: CD-DA
10: CD-Data (DATA CD)
FF: Others
Request/Preset DISC STATUS SENSE [56]
CURRENT TRACK INFORMATION RETURN
This is the return command for the command "CURRENT TRACK INFORMATION SENSE [57]".
If the Play mode is Program mode, this returns the program number. For any other Play mode, it
returns the track number.
Command D7
Machine ID 0
Data 12 bytes
Description Remarks
Data 1 Tens digit of the track number
Data 2 Ones digit of the track number
Data 3 Thousands digit of the track number
Data 4 Hundreds digit of the track number
Data 5 Tens digit of the minutes
Data 6 Ones digit of the minutes
Data 7 Thousands digit of the minutes
Data 8 Hundreds digit of the minutes
Data 9 Tens digit of the seconds
Data 10 Ones digit of the seconds
Data 11 Tens digit of the frames
Data 12 Ones digit of the frames
Request/Preset CURRENT TRACK INFORMATION SENSE [57]
CURRENT TRACK TIME RETURN
This is the return command for the command "CURRENT TRACK TIME SENSE [58]".
It returns the current track time or the disc time.
Command D8
Machine ID 0
Data 10 bytes
Description Remarks
Data 1
Data 2 Time Mode
00: Track elapsed time
01: Track remaining time
03 Disc remaining time
Data 3 Tens digit of the minutes
Data 4 Ones digit of the minutes
Data 5 Thousands digit of the minutes
Data 6 Hundreds digit of the minutes
Data 7 Tens digit of the seconds
Data 8 Ones digit of the seconds
Data 9 Tens digit of the frames