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How to use the RS-232C connector
This input/output connector (D-Sub 9-pin female) is used for
RS-232C external control.
A straight cable available on the market can be connected to
this connector to exercise external control and send status
information.
• Connector pin assignment
• RS232C Connection
The wiring requirements for a 9 pin to 9 pin serial connection,
are a male to female straight cable.
• RS-232C physical specifications
• Command reception
The command packets have a data length of 5, 6 or 7 bytes.
ASCII codes from 0x00 to 0x7f are used to receive serial data.
At the transmission end, therefore, take steps to convert the
ASCII codes into HEX data to set the data in the data packets.
CR (0x0d) is added as the data packet delimiter.
1NC
2TX
3RX
4NC
5 GND
6NC
7NC
8NC
9NC
69
51
Cable Straight cable
Baud rate 9600 bps
Data bits 8 bits
Parity bit None
Stop bit 1 bit
Flow control None
Command Code Command Code
0 2000 Pitch Down Start 2039
1 2001 Pitch Down Stop 203901
2 2002 Program 2041
3 2003 AMS 2043
4 2004 Open/Close 2045
5 2005 Pause 2048
6 2006 Cancel 2049
7 2007 Fast Backward Start 2050
8 2008 Fast Backward Stop 205001
9 2009 Fast Forward Start 2052
Time 2011 Fast Forward Stop 205201
Recall/Scroll 2015 Play 2053
Random 2028 Stop 2054
Repeat 2029 A-B 2059
Next 2032 Display (Dimmer) 2071
Previous 2033 Menu 2082
Index + 2034 Enter 2087
Index - 2035 Text 2088
Pitch Reset 2037 Quick Replay 205304
Pitch Up Start 2038 Cue 205910
Pitch Up Stop 203801
• Status transmission
The status packets have a fixed data length of 4 bytes.
ASCII codes from 0x00 to 0x7f are used to transmit serial
data. For this reason, the ASCII codes are converted into
HEX data before the data is set in the data packets and
transmitted. CR (0x0d) is added as the data packet delimiter.
Received command data
Example: Reception Time Command (code 2011)
2 0 1 1 CR
0x32 0x30 0x31 0x31 0x0d
Transmitted status data
Status Code Description
Power On PWON Transmitted when the power is turned on.
Tray Open TROP Transmitted upon completion of tray open.
Tray Close TRCL Transmitted upon completion of tray close.
TOC Error TOCE
Transmitted when a TOC read error has occurred.
TOC Reading TOCR Transmitted when TOC read is started.
No Disc NODI Transmitted when “No disc” is detected.
Stop STOP Transmitted when the disc has stopped.
Play Pxxx
Pause Axxx
Fast Forward FFON Transmitted when Fast Forward is started.
Fast Backward RWON Transmitted when Fast Backward is started.
Repeat Off RPOF Transmitted when Repeat Off is set.
Repeat All RPAL Transmitted when Repeat All is set.
Repeat One RPON Transmitted when Repeat One is set.
Repeat A RPA- Transmitted when Repeat A is set.
Repeat AB RPAB Transmitted when Repeat A-B is set.
End Warning ENDW Transmitted when End Warning is started.
Transmitted along with the track number (xxx)
when play is started; also transmitted when
the track number is changed during play.
Transmitted along with the track number (xxx)
when the pause status is established.
Example 1: Transmission Power On (code PWON)
P W O N CR
0x50 0x57 0x4f 0x4e 0x0d
OTHER FUNCTIONS
PMD325 Typical HOST
Transmit Data
Receive Data
Ground
Rx Data
Tx Data
Ground
2
3
5
2
3
5
D-Sub 9 Pin
(male)
D-Sub 9 Pin
(female)
When transmitting commands consecutively, put more than
100ms blank between commands.