Marantz DV7110 - Manuel (Page 51)

51
ADDITIONAL
INFORMA
TION
ENGLISH
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
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
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
Reponse code format
Normal response Error response
Pin No. Signal
1 Not connected
2 RXD
3 TXD
4 Not connected
5 GND
6 Not connected
7 RTS
8 CTS
9 Not connected
6
1 5
9
RTS
CTS
TXD
RXD
CTS
RTS
RXD
TXD
@ 1 0Dh
OK
06h
ERR
15h
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
OK
Answer
data
OK
Status
Command
Normal
Command
Request
Command
DV7110 PC DV7110 PC
Header Addr COMMAND Return