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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.
1
5
1
2
3
4
6
9
5
6
7
8
9
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
TXD
RXD
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
@
1
Reponse code format
Normal response
Error response
OK
06h
Signal
Not connected
RXD
TXD
Not connected
GND
Not connected
RTS
CTS
Not connected
CTS
RTS
RXD
TXD
Return
0Dh
ERR
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
Normal
Command
OK
Request
Command
Answer
data
DV7110
PC
Status
Command
OK
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