Panasonic AJSD930P Operating Instructions Manual page 70

RS-232C interface
Software specifications (Protocol)
1. Communication parameters
Communication Asynchronous, full duplex
system
Communication 300/600/1200/2400/4800/9600
speed
Bit length 7bit/8 bit
Stop bit 1 bit/2 bit
Parity bit NONE/ODD/EVEN
ACK code ACK code returned/ACK code not returned
<Note>
The ACK code is what is returned from the
VTR to the controller when data has been
successfully sent from the controller.
The underlining indicates the factory settings.
Any changes to the settings can be made using the
setup menu items listed below.
Communication
parameter
Communication No.205 BAUD RATE
speed
Bit length No.206 DATA LENGTH
Stop bit No.207 STOP BIT
Parity bit No.208 PARITY
ACK code No.209 RETURN ACK
70
Setup menu item
2. Send format
[controller (PC) 5 VTR]
$ Data format
[STX] [command]
02h XX XX XX
20H<XX<7FH
(XX = ASCII code: symbols, numbers upper-case
letters)
[command] :
Command identifier; a 3-byte identifier (ASCII
code: symbols, numbers, upper-case letters) is
sent as the command.
[ : ] :
This code serves as a delimiter between the
command and data.
[data] :
Data (ASCII code: symbols, numbers, upper-
case letters) can be added in the number of
bytes required.
$ Outline of send procedure from controller
1 The send command starts with STX (start of text =
02h).
The command is then identified by COMMAND
which follows and the data is added as required.
The format ends with ETX (end of text = 03h).
2 When a different command is to be sent, a
response is awaited from the VTR, and then the
command is sent. (See page
3 If STX is sent again before ETX is sent, the receive
data buffer inside the VTR is cleared. A command
error is returned to the controller, and the data is
newly processed with STX which was received
again at the head.
[:] [data] [ETX]
XX ..... XX
3Ah 03h
72.)