322
RS-232 Specification
RS-232 IMPLEMENTATION OVERVIEW
TASCAM's 322 cassette deck has a standard RS- 232C port, capable of receiving commands and sending status information. Commands are included for transport functions, including CPS (Compumatic Program Search), Counter Reset, and Sync Reverse settings. Tally information will include deck status, timer information and record prohibit status.
• Individual Control Over Each Deck |
• Extensive Transport Control Command Set |
(Includes CPS, RTZ, Sync Reverse and Dubbing) |
• Transport Status Tallies |
• Tape Counter Readout Information (MM:SS) |
• Tape Counter Reset Command |
Connector: | DB9 |
Pin 2: | Rx Data |
Pin 3: | Tx Data |
Pin 5: | Ground |
| Rx Data |
Data Transmission Speed: 9600 bps
Command Spacing: | >20msec | |
Character Length: | 8 bit | |
Parity Bit: |
| None |
Stop Bit: |
| 1 bit |
2 | Tx Data |
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• Tape Status (Record Prohibit/Enable) |
• Empty Deck Indication |
COMMAND STRUCTURE & BEHAVIOR
Basic Transport Commands:
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LF |
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0Ah | 30h |
| 31h | 31h |
| 30h | 31h | 30h | 31h |
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PLAY, DECK 1, SIDE A |
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Tx Data |
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322 |
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Status Request Commands:
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0Ah | 30h |
| 35h | 30h |
| 30h | 31h | 00h |
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SENSE MECHANISM STATUS, DECK 1
Preamble - All command strings for the 322 begin with an identifying phrase of "Line Feed" (0Ah) and a "0" (30h).
Command - The command follows the preamble directly. (For a complete list of all the commands, see Transport Commands on the next page.)
Deck - This determines whether the command is targeted at Deck 1 (30h 31h) or Deck 2 (30h 32h).
Direction - For commands which have directionality to it, this determines whether the forward or reverse direction is desired. Forward direction (30h 31h) and reverse direction (30h 32h) are used for commands with direction. Transport commands without direction use a "no direction" (30h 30h) place holder.
Delimiter - All command strings for the 322 end with "Carriage Return" (0Dh) as the delimiter.
Status request commands will follow the same structure as basic transport commands, except a direction is not included in the command. (That information will be given in the reply.)
The 322 does not automatically generate status commands when mechanisms change, so the controller will need to scan the 322 at some rate.
When setting a scanning cycle, it is important to recognize that the 322 requires 20 milliseconds between commands. Since there are 3 types of information per deck (time, record prohibit, and mechanism status), it is easily possible to scan each status every half second, and still only be sending messages to the 322 every 83 milliseconds.
TASCAM USA has tested the 322, scanning each status type every half second, and the 322 performed flawlessly.
7733 Telegraph Road • Montebello, CA 90640 • (323) | Page 1 of 5 |
All features and specifications are subject to change without notice. Contact your local TASCAM representative for the latest information. | |
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