Revox RS 232 Brochure

Page 1

STUDER PROF.AUDIO AG 30.07.1597

ASCII Protocol Specifications of R5232 Serial Interface for analog tape recorders
REVOX C270, STUDER A807, STUDER A810, STUDER A312, STUDER A816, STUDER A320-2CH

STUDER Norm-NIL 10.85.1330

1 COMMUNICATION FORMAT

Asynchronous, bit serial signal
- according to RS 232 C specifications;
- full duplex communication channel;
» data transmission rate: 9600 bauds;
» word composition as follow:
1 START bit, 8 data bits, no parity, 1 STOP bit;

-»-+ +----+----+--*----+--+----+----+----+----+ - MARK
|START| D0 1 D1 | D2 [ D3 | D4 | DS | D6 l D7 [STOP

| bit | LSB] | | | | | | MSEI bit

+ ----- +»»--+----+----+--+----+---+----+----+- - - - SPACE

Connector specifications
- 9 pin connector, D type, ISMPTE/BUS / R5232 connector);

- pin out:

controller machine

Screen

Transmit data

Receive data

Signal ground

2. MESSAGE FORMAT

The communication between the STUDER machine and the controller is implemented through ASCII coded strings

of not fixed length.

'A message string is composed by ASCII characters:

capital letters, "?". ", figures and the following control characters
'CR' (ODh)
'LF' (DAh)
' CX' (18h)
XDFF' (13h)
'XON (11h)

All commands mnemonics have a length of 3 characters and are usually terminated by a CR.

Only commands with parameters vary in length. The additional characters are inserted between the command and 'CR"

Page 2

Z

The parameters are separed by blanks or colons. There are some exceptions: commands which do not have termination

characters. Please refer to the individual command description for the exact syntax of each command.

The SIUDER machine uses the sequence '01 LF as acknowledge message or to terminate the answer string.

Ex:

"WNF 0400" CR'

WNF
0400

<1

= controlled wind forward at 4 times nominal speed

command ,

parameter,

controlled wind forward
0400h coded as ASCII string

the controller will send to the machine:

character

,w,
.N,
.F.
,0,
.4.
,0.
,0.
,CR,

ASCI I Code sent

57h
4Eh
46h
20h
30h
34h
30h
30h
ODh

The machine should answer:

'CR
'LF

The LX' control

ODh
DAh

character is used by the controller to reset asynchronously the STUDER machine's communication port.

XOPF and XON are used by the machine as handshake characters.

For terminal operation the machines communication port can operate in echo mode' . In this mode, an echo of each character is

sent back to the controller, and a prompt ('>) is sent after the answer string.

The echo mode may be set via the machine menu. It should not be used for computer remote control.

3. COMMUNICATION PROTOCOL

a) general informations

The communication between the controller and the S'IUDER machine is a master-slave protocol. The controller

is the master and it should take initiative in the communication. The communication has to fulfill the following

specifications:

- the machine has to acknowledge a command with a CR LF within 100 msec from the moment

that the commands last byte is received;

- the machine's communication port is asynchronously resetted (both receiver and transmitter) by a 'CX

sent by the controller, and it has to acknowledge it with a CR LF in the specified time,-

7 the machine can

sending an XON

interrupt
', They do

- for the controller, there

- the controller should not

b) Error messages

the controller in any moment by sending an 'XOFF' and recover the connection

not have to be acknowledged by controller;

is no time specification for the interval between two bytes of a command;

output the next command before receiving the machine's answer (exception: CX' ).