Marantz DV7110 manual RS-232C System control

RS-232C System control

This DVD player can be controlled by a PC. Connect the player and a serial port on the PC with a 9-pin RS-232C straight cable. To control this DVD player by a PC, set the RS- 232C switch on the rear panel to RS-232C.

RS-232C Pin assignments

		Pin No.	Signal
1	5	1	Not connected
		2	RXD
		3	TXD
6	9	4	Not connected
		5	GND
		6	Not connected
		7	RTS
		8	CTS
		9	Not connected

Communication conditions

Configure the serial port of the PC as shown below.

Baud Rate	9600bps
Data Bits	8bit
Parity	None
Stop bit	1bit
Handshaking	RTS/CTS

SYSTEM (HOST) ´ DV7110

RTS	CTS
CTS	RTS
TXD	RXD
RXD	TXD

1.The host requests data by setting RTS to L.

2.Upon data request by CTS, the slave responds by setting RTS to H if not busy.

3.The host checks if CTS is H and starts data output on TXD.

4.When data output finishes, the host sets RTS to H.

5.The slave checks if CTS is H and sets RTS to L.

Basic format

Command format

Header	Addr COMMAND	Return
@	1	0Dh

Reponse code format
Normal response		Error response
	OK		ERR
	06h		15h

ENGLISH

System commands

There are 3 types of commands. Normal command is to request operation from PC to DVD player. Request command is to request player status and Status command is to let the PC know the change of DVD player status.

Upon reception of a command, DVD player will return either OK, ERROR or Status.

ASCII code is used for data and letters are case sensitive. The start character and the end character are added as shown below for sending command and returning status. The DVD player’s own ID code follows the start character. This ID code is 1.

Start Character	:	’@’
End Character	:	0Dh
Command Sample	“1?A”, 0Dh
	(ID=1 Request Power Status)
FeedbOK Sample	“1A1“, 0Dh
	(ID=1 Power Status = On)

The following codes are used for OK and ERROR.

OK (data receive successful) : 06h

ERROR (data receive error) : 15h

The receiving side ignores data received prior to ’@’. If 0Dh is received without receiving ’@’, ERROR(data receive error) will be returned.

For numeric data, ASCII coded hexadecimal number is used.

(example) For a decimal number 26

'1', 'A' → 0x31, 0x41

Hand shake flow chart

Normak command and			Request command
Request command
DV7110	PC		DV7110	PC
		Normal			ADDITIONAL
		Command
			Status
OK			Command
		Request		OK	INFORMATION
		Command
Answer
data

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