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Alesis ADAT-M20 Supplementary Manual

Rs-422 implementation
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ALESIS M20
RS-422
Implementation
Second Revision
August 5, 1999

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Summary of Contents for Alesis ADAT-M20

  • Page 1 ALESIS M20 RS-422 Implementation Second Revision August 5, 1999...
  • Page 2 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.

  • Page 3: Command Block Format

    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. Alesis M20 RS-422 Document ………………………………...………………………………Page 3 Data -1 Data-n...

  • Page 4: Connector Pin Assignment

    • 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 4 DEVICE Ground...
  • Page 5 20.02 Record 20.04 Standby Off 20.05 Standby On 20.0F Eject 20.10 Fast Forward 2X.11 Jog Fwd 2X.12 Var Fwd 2X.13 Shuttle Fwd 20.20 Rewind 2X.21 Jog Rev 2X.22 Var Rev 2X.23 Shuttle Rev Alesis M20 RS-422 Document ………………………………...………………………………Page 5 M20 RESPONSE...
  • Page 6 44.04 TimeCode Gen Preset 44.05 TimeCode Gen UBit Preset 40.08 Timer-1 Reset 40.10 In Entry 40.11 Out Entry 40.12 A In Entry 40.13 A Out Entry 44.14 In Data Preset 44.15 Out Data Preset Alesis M20 RS-422 Document ………………………………...………………………………Page 6 M20 RESPONSE...
  • Page 7 40.42 Spot Erase Off 40.43 Spot Erase On 40.48 Video Reference Disable Off 40.49 Video Reference Disable On 42.50 DA Input Select 42.51 DA Sys Emph Select 41.58 DA Sys Fs Select 45.78 Chase Offset Alesis M20 RS-422 Document ………………………………...………………………………Page 7 M20 RESPONSE...
  • Page 8 60.3C Postroll Duration Sense 60.50 DA Input Sense 60.51 DA Sys Emph Sense 60.52 DA Input Emph Sense 60.53 DA PB Emph Sense 60.58 DA Sys Fs Sense 61.78 Chase Offset Sense Alesis M20 RS-422 Document ………………………………...………………………………Page 8 M20 RESPONSE...

  • Page 9: System Control

    None Response: Device Type = 12.11 Data = 2x yy x is the TC frame rate: 0=30 frm, 1=25 frm, 2=24 frm yy is the device id: 25h = BVW-75 Alesis M20 RS-422 Document ………………………………...………………………………Page 9 BIT5 BIT4 BIT3 BIT2...

  • Page 10: Transport Control

    Action: Estimate speed closest to M20 capabilities. When only DATA-1 (N) is given, Tape Speed = 10 When both DATA-1 (N) and DATA-2 (N’) are given, Tape Speed = 10 ((N/32)-2) Alesis M20 RS-422 Document ………………………………...………………………………Page 10 (required) (optional) (required) (optional) ((N/32)-2)
  • Page 11 Deviation(% )= 0.1 x Speed Value Action: Positive Pitch change 21.39 Program Speed Play- Data: DATA-1 = 8-bit Speed Value that ranges from 0 to 60 (0..3CH) Deviation(% )= -0.1 x Speed Value Action: Negative Pitch change Alesis M20 RS-422 Document ………………………………...………………………………Page 11...
  • Page 12 Action: Enable the anti-clog timer. Return the unthread timeout to the last non- infinite value. The unthread timeout value can be viewed and/or edited in the Utility pages. (Currently, the user is not able to select the infinite setting from the front panel) Alesis M20 RS-422 Document ………………………………...………………………………Page 12...
  • Page 13 PRESET command to the EE mode (disable AutoInput) 20.63 Edit Off Action: Cancels the EDIT REC mode as well as the SELECT EE mode (enable AutoInput) 20.64 Edit On Action: Enter EDIT REC PLAY mode (punch-in) Alesis M20 RS-422 Document ………………………………...………………………………Page 13...
  • Page 14 Action: Clear the IN flag (STATUS-3, Bit 0) or OUT flag (STATUS-3, Bit 1) 40.24 In Recall 40.25 Out Recall 40.26 A In Recall 40.27 A Out Recall Action: Set the IN flag (STATUS-3, Bit 0) or OUT flag (STATUS-3, Bit 1) Alesis M20 RS-422 Document ………………………………...………………………………Page 14...
  • Page 15 Chase Offset Preset Data: DATA-1=Frame, DATA-2=Seconds, DATA-3=Minutes, DATA-4=Hours, • All data bytes are in BCD format (ms nibble=tens; ls nibble=ones) Action: Set Chase Offset Alesis M20 RS-422 Document ………………………………...………………………………Page 15 Bit4 Bit3 Bit2 Bit1 Assem Video Trk2 track bitmap of unit #1..unit #14...

  • Page 16: Sense Request

    Respond with 70.0D: REQUEST TIME DATA MISSING if requested data is other than Timer-1 or Timer-2 data, and when following conditions exist: • Immediately after power-on and until tape starts moving • Cassette out • During loading or unloading Alesis M20 RS-422 Document ………………………………...………………………………Page 16...
  • Page 17 TapeTC mode, the ABS + SMPTE Offset timecode will be displayed instead of the TC track timecode. Alesis M20 RS-422 Document ………………………………...………………………………Page 17 (LS nibble=# of status bytes to be sent back) (LS nibble=# of status bytes to be sent back)

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