Tascam RS-232 - Manual

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.

Page 1 of 5

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