Alesis ADAT-M20 Handbuch

ALESIS M20

RS-422

Implementation

Second Revision

August 5, 1999

Alesis M20 RS-422 Document ……………………………….........………………………………Page 2

INTRODUCTION

This document contains information outlining the implementation of the Sony 9-Pin

Protocol in the Alesis M20. This is not an official Sony 9-pin protocol document and

should not be viewed as such. It is for reference purposes only. To obtain official Sony 9-

pin protocol documents, contact Sony directly.

INTERFACE SYSTEM OVERVIEW

•Conforming to EIA RS-422A

•Four-wire communications channel is utilized

•Data is transmitted asynchronously, bit serial, word serial with data transmissions between

devices being digital

•Standard transmission rate on the interface bus is 38.4 kilobits per second (kb/s)

•The data utilized by the interface system shall be as follows:

Odd Parity means that the sum of D0 + D1 + … + D7 + PARITY equals an odd number.

(LSB) D1 D2 D3 D4 D5 D6 D7

(MSB) PARITY

(ODD) STOP

BIT

MARK

SPACE

START

BIT

1 START Bit + 8 DATA Bits + 1 PARITY Bit + 1 STOP Bit

Alesis M20 RS-422 Document ……………………………….........………………………………Page 3

COMMAND BLOCK FORMAT

The definition of CONTROLLER and DEVICE throughout this document shall be as follows:

“CONTROLLER” refers to the unit which controls the VTR.

“DEVICE” refers to the unit (VTR) which is controlled.

The communication between the CONTROLLER and DEVICE is composed of the following:

When the Data Count is zero, the Data is not transmitted. When it is not zero, the Data corresponding to the value is

inserted between Cmd 2 and Checksum.

Cmd 1

Cmd 1 classifies the COMMAND into main groups which indicate the Function and Direction of the data to

follow.

Data Count

Data Count indicates the number of data bytes added following Cmd 2. It ranges from 0 to F.

Cmd 2

Cmd 2 is the designated COMMAND sent to the DEVICE or returned from the DEVICE.

Data

The number of data bytes and the content is defined by the specific Cmd 2.

Checksum

The Checksum is the sum of all bytes in the message, from Cmd 1/Data Count to the last byte before the

Checksum. The Checksum is used to verify data accuracy and reject communication sequences that contain bit

errors.

Data

Cmd 1 Count Cmd 2 Data -1 Data-n Checksum

(n = max 15)

1 Byte 1 Byte 1 Byte 1 Byte 1 Byte

MSD LSD

CMD 1 FUNCTION DIRECTION

CONTROLLER DEVICE

System Control

System Control Return

Transport Control

Preset & Select Control

Sense Request

Sense Return

Alesis M20 RS-422 Document ……………………………….........………………………………Page 4

CONNECTOR PIN ASSIGNMENT

The interface connector is a 9-pin D-subminiature female connector. The pin assignment for the

CONTROLLER and DEVICE is as shown in the following table:

PIN CONTROLLER DEVICE

1 Ground Ground

2 Receive A Transmit A

3 Transmit B Receive B

4 Transmit Common Receive Common

5 Spare Spare

6 Receive Common Transmit Common

7 Receive B Transmit B

8 Transmit A Receive A

9 Ground Ground

COMMUNICATION PROTOCOL

All communication between CONTROLLER and DEVICE are under the direct supervision of the

CONTROLLER.

The CONTROLLER shall not transmit additional Command Blocks to the DEVICE prior to receiving an

appropriate response to the previous Command Block.

The CONTROLLER shall not interrupt transmission of a byte in a Command Block for more than 10

milliseconds. A DEVICE detecting the interruption of a byte in a Command Block that exceeds 10 ms

shall execute a Time-Out error sequence. A DEVICE shall void the receiving Command Block and

transmit a NAK (Time-Out).

The DEVICE, following the receipt of a Command Block from the CONTROLLER shall transmit a

response within 9 milliseconds.

The DEVICE, upon detection of an error, shall immediately transmit a NAK to the CONTROLLER, with

the appropriate error code. The CONTROLLER, upon receipt of the NAK, shall immediately stop

transmission of the Command Block

The M20 is a DEVICE (i.e. it only responds to and does not generate Sony 9-Pin commands). In general,

the M20 responds to commands in the following manner:

1) Recognized/supported command:

• Return an ACK as response to command not requiring data.

• Return appropriate data requested.

2) Checksum mis-match:

• Return a NAK (with data=checksum error) and take no action.

3) Unrecognized/unsupported command:

• Return a NAK (with data=undefined error) and take no action.

4) Number of data bytes is less than expected (e.g. Data byte count < # of bytes needed)

• Return a NAK (with data=undefined error) and take no action.

5) If more than 10 milliseconds lapses between bytes in a command block:

• Return a NAK (with data=timeout error) and take no action.

Alesis M20 RS-422 Document ……………………………….........………………………………Page 5

COMMAND/RESPONSE CHART

The marks shown in the tables mean the following:

“O”indicates that response to this command is supported; returns appropriate response

“*”indicates that the appropriate status bits are set, but the M20 does nothing;

returns an ACK (10.01)

“X”indicates that this command is not supported; returns a NAK Undefined (11.12.01)

COMMAND M20 RESPONSE

00.0C Local Disable O

00.1D Local Enable O

00.11 Device Type Request O

01.80 Memory Area Number Preset X

00.81 Memory Area Number Sense X

04.82 Memory Area Length Preset X

00.83 Memory Area Length Sense X

01.84 Memory Area Select X

00.85 Memory Area Select Sense X

01.86 Mem Area Output Select X

00.87 Mem Area Output Select Sense X

20.00 Stop O

20.01 Play O

20.02 Record O

20.04 Standby Off O

20.05 Standby On O

20.0F Eject O

20.10 Fast Forward O

2X.11 Jog Fwd O

2X.12 Var Fwd O

2X.13 Shuttle Fwd O

20.20 Rewind O

2X.21 Jog Rev O

2X.22 Var Rev O

2X.23 Shuttle Rev O

Alesis M20 RS-422 Document ……………………………….........………………………………Page 6

COMMAND M20 RESPONSE

20.30 Preroll O

24.31 Cue With Data O

2X.37 Chase O

21.38 Prog Speed + O

21.39 Prog Speed - O

20.40 Preview O

20.41 Review O

20.42 Auto Edit O

20.54 Anti-Clog Timer Disable O

20.55 Anti-Clog Timer Enable O

20.60 Full EE Off O

20.61 Full EE On O

20.63 Select EE On O

20.64 Edit Off O

20.65 Edit On O

20.6A Freeze Off *

20.6B Freeze On *

20.80 Memory Stop X

20.81 Memory Play X

20.82 Memory Write Start X

20.93 Memory Read Fwd X

22.A3 Memory Red Rev X

26.B1 Memory Rd-Pointer Preset X

44.00 Timer-1 Preset X

44.04 TimeCode Gen Preset O

44.05 TimeCode Gen UBit Preset O

40.08 Timer-1 Reset O

40.10 In Entry O

40.11 Out Entry O

40.12 A In Entry O

40.13 A Out Entry O

44.14 In Data Preset O

44.15 Out Data Preset O

Alesis M20 RS-422 Document ……………………………….........………………………………Page 7

COMMAND M20 RESPONSE

40.16 A In Entry Preset O

40.17 A Out Entry Preset O

40.18 In Shift + O

40.19 In Shift - O

40.1A Out +Shift O

40.1B Out -Shift O

40.1C A In +Shift O

40.1D A In -Shift O

40.1E A Out +Shift O

40.1F A Out -Shift O

40.20 In Flag Reset O

40.21 Out Flag Reset O

40.22 A In Flag Reset O

40.23 A Out Flag Reset O

40.24 In Recall O

40.25 Out Recall O

40.26 A In Recall O

40.27 A Out Recall O

40.2D Lost Lock Reset *

4x.30 Edit Preset O

44.31 Preroll Duration Preset O

41.32 Tape/Auto Select X

41.33 Servo Reference Select X

4x.34 Head Select X

41.35 Color Frame Select X

41.36 Timer Mode Select O

41.37 Input Check X

44.3C Postroll Duration Preset O

40.40 Auto Mode Off O

40.41 Auto Mode On O

40.42 Spot Erase Off X

40.43 Spot Erase On X

40.48 Video Reference Disable Off X

40.49 Video Reference Disable On X

42.50 DA Input Select X

42.51 DA Sys Emph Select X

41.58 DA Sys Fs Select X

45.78 Chase Offset O

Alesis M20 RS-422 Document ……………………………….........………………………………Page 8

COMMAND M20 RESPONSE

4X.A0 Audio Input Level X

4X.A1 Audio Output Level X

61.0A TC Gen Data Sense O

61.0C Current Time Sense O

60.10 In Data Sense O

60.11 Out Data Sense O

60.12 A In Data Sense O

60.13 A Out Data Sense O

61.20 Status Sense O

62.23 Signal Cont Data Sense X

61.2A HM Data Sense X

61.30 Edit Preset Sense O

60.31 Preroll Duration Sense O

60.33 Servo Reference Select Sense X

60.36 Timer Mode Sense O

60.3C Postroll Duration Sense O

60.50 DA Input Sense X

60.51 DA Sys Emph Sense X

60.52 DA Input Emph Sense X

60.53 DA PB Emph Sense X

60.58 DA Sys Fs Sense O

61.78 Chase Offset Sense O

Alesis M20 RS-422 Document ……………………………….........………………………………Page 9

M20 COMMAND RESPONSE DETAIL

M20 Responses

10.01 ACK

- Sent in response to receiving a valid command that does not require data.

12.11 Device Type Return

-Sent as response to Device Type Request command.

-The M20 responds as a Sony BVW-75: 2x 25

where x is TC frame rate: 0=29.97 or 30, 1=25, 2=24

11.12 NAK

-Sent when detecting communication errors or as response to receiving an

undefined command.

-Data Format:

SYSTEM CONTROL

00.0C Local Disable

Action: Put M20 into Remote Only Mode (ONLINE CTRL: Remote)

00.1D Local Enable

Action: Put M20 into Local/Remote Mode (ONLINE CTRL: Local/Rem)

00.11 Device Type Request

Action: None

Response: Device Type = 12.11 Data = 2xyy

xis the TC frame rate: 0=30 frm, 1=25 frm, 2=24 frm

yy is the device id: 25h = BVW-75

TIME OUT FRAMING

ERROR OVERRUN

ERROR PARITY

ERROR CHECKSUM

ERROR UNDEFINED

COMMAND

BIT7 BIT6 BIT5 BIT4 BIT3 BIT2 BIT1 BIT0

Alesis M20 RS-422 Document ……………………………….........………………………………Page 10

TRANSPORT CONTROL

• Chase mode is automatically cancelled by all "2x" commands, except 2x.37, 20.60,

20.61, 20.63, 20.64, and 20.65.

20.00 Stop

Action: Stop the tape

20.01 Play

Action: Play the tape

20.02 Record

Action: Record (Punch-In Only) from any state. Any other transport

command, except Eject and Standby Off, will cause a record exit.

20.03 Standby Off

Action: If already in standby, then unthread the tape (stop in mode1)

If not in standby, then do nothing (just send ACK)

20.04 Standby On

Action: Pause the tape (stop in mode2)

Standby = Stopped with the tape threaded.

20.0F Eject

Action: Eject the tape.

If recording, do nothing (just send NAK data=undefined)

20.10 Fast Forward

Action: Forward the tape

2X.11 Jog Forward

2X.12 Var Forward

2X.13 Shuttle Forward

Data: DATA-1 = N = Coarse speed variable (required)

DATA-2 = N’ = Fine speed variable (optional)

Action: Estimate speed closest to M20 capabilities.

20.20 Rewind

Action: Rewind the tape (threaded or unthreaded)

2X.21 Jog Rewind

2X.22 Var Rewind

2X.23 Shuttle Rewind

Data: DATA-1 = N = Coarse speed variable (required)

DATA-2 = N’ = Fine speed variable (optional)

Action: Estimate speed closest to M20 capabilities.

When only DATA-1 (N) is given,

Tape Speed = 10((N/32)-2)

When both DATA-1 (N) and DATA-2 (N’) are given,

Tape Speed = 10((N/32)-2) + (N’/256)(10(N-(1/32)-2) -

10((N/32)-2))

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