Interface Connector - Pioneer DV-F727 Service Manual

DV-F727, DV-F07

7.1.5 INTERFACE CONNECTOR

• Communication control
The protocol system is based on a system in which the computer
gives commands and the player returns statuses. The communication
protocol used conforms to that used by industrial and educational
equipment (changers, drives, LD players for educational use, etc.)
of our company, and supports Communication Mode 7 (CM 7).
CM 7 uses a method of proceeding a program by issuing each
execution command and confirming the execution status with a
request command.
First, the controller sends an execution command, and the player
returns the status of having received the command. Then, the
controller sends a request command, and the player returns the
corresponding status data. The controller repeats this operation until
it receives the status data required.
In CM 7, neither Completion of Execution Status nor error messages
are returned. Statuses returned in response to execution commands
are the End of Receive message <R> and Communication Errors
<E 00>. To confirm Completion of Execution or occurrence of
errors, use the request command "?J." However, note that some
commands have restrictions or conditions, and that some commands
cannot be executed or may not be executed as they should be.
• Format
Serial control interface in conformance with the RS-232C Standards
• Connector
15-pin, D-sub connector
9 10 11
1 2 3 4
• Signal Line
No. Name I/O
−
1 GND Ground
2 TxD O Transmission output
3 RxD I Receiving input
4 DTR O Transmission permission
−
5 Reserved
−
6 Reserved
−
7 Reserved
−
8 Reserved
−
9 Reserved
−
10 Reserved
−
11 GND Ground
−
12 Reserved
−
13 Reserved
−
14 Reserved
−
15 GND Ground
74
12 13 14 15
5 6 7 8
Function
• Specifications of Interface
Signal level : RS-232C level
Data format
Data length : 8 bits
Stop bit : 1 bit
Parity : none
Transmission speed (baud rate):
Selectable between 9600 and 19200 bps, by exclusive command
of the player. Every time the power is turned on, the baud rate
is reset to 9600 bps.
Connection:
The computer and this unit are connected through three lines, as
shown below:
TxD
Computer
RxD
GND
The player can receive commands any time as long as the power is
on. So, even when the RS-232C port of the computer is used,
connection of any control lines other than TxD and RxD is NOT
necessary.
However, some computers need physical CTS input for operation.
In this case, the DTR output, which always outputs positive electric
potential as long as transmission is possible, can be used. Connect
the DTR output to the CTS input of the computer as shown below:
Example of connection (connection with a DOS/V computer)
This Unit (Player)
D-SUB 15P
TxD (2)
RxD (3)
GND (1)
DTR (4)
RxD
TxD This Unit
GND
Computer (DOS/V)
D-SUB 9P
RxD (2)
TxD (3)
GND (5)
CTS (8)