Panasonic VQT9958 Software specifications Protocol, Communication parameters

CONTENTS

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	Setup menu item
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

2.Send format [controller (PC) 5 VTR]

$ Data format

[STX]	[command]	[:]	[data]			[ETX]
02h	XX XX XX	3Ah	XX	.....	XX	03h

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

1The 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).

2When a different command is to be sent, a response is awaited from the VTR, and then the command is sent. (See page 70.)

3If 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.

68 (E)