322
RS-232 Specification
7733 Telegraph Road • Montebello, CA 90640 • (323) 726-0303 • http://www.tascam.com
All features and specifications are subject to change without notice. Contact your local TASCAM representative for the latest information.
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322_RS-232_TECHDOC.pdf
030404
• 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
• Tape Status (Record Prohibit/Enable)
• Empty Deck Indication
RS-232 IMPLEMENTATION OVERVIEW
COMMAND STRUCTURE & BEHAVIOR
Data Transmission Speed:
Command Spacing:
Character Length:
Parity Bit:
Stop Bit:
9600 bps
>20msec
8 bit
None
1 bit
Connector:
Pin 2:
Pin 3:
Pin 5:
DB9
Rx Data
Tx Data
Ground
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.
Basic Transport Commands:
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:
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.
Rx Data
Tx Data
Ground
Tx Data
Rx Data
Ground
5
3
2
322 RS-232 Port
External Unit
LF
Pr
ea
m
bl
e
Co
m
m
an
d
De
ck
Di
re
ct
io
n
De
lim
ite
r
CR
0Ah 30h
30h
30h
31h
31h
31h
31h 0Dh
0
0
0
1
1
1
1
LF
Pr
ea
m
bl
e
Co
m
m
an
d
De
ck
De
lim
ite
r
0Ah 30h
30h
00h
35h
31h
30h
0
0
CR
5
1
0
RS-232 Pin Assignment & Protocol Specification:
SENSE MECHANISM STATUS, DECK 1
PLAY, DECK 1, SIDE A
