TASCAM CD-A750 RS-232C Protocol Specifications
3
TEAC
Corporation
1.
Overview
The CD-A750 can be controlled by computer or external device via RS-232C connector on the rear panel
with the RS-232C serial protocol. In this document, the CD-A750 is referred to as the "controlled device,"
and the external device that controls it is referred to as the "external controller."
2.
Specifications
Electrical specifications
Conforms to standard
JIS X-5101
(equivalent to former JIS C-6361 and EIA RS-232C)
(Not compatible with the RS-422A used in professional VTR units)
Impedance at receiver
Measured with an applied voltage of between ±3 and 15V, the DC
resistance is between 3K
Ω
and 7K
Ω
.
Total load capacitance is less than 2500pF
Open circuit voltage at transmitter Less than 25V
Open circuit voltage at receiver
Less than 2V
Signal voltage
Open circuit voltage at the receiver is 0V, the signal voltage is
between ±5V and ±15V for a load impedance of between 3K and
7K
Ω
.
Signal discrimination
Logical “1”
Less than -3V
Logical “0”
More than +3V
Communication format
Circuit type
3-wire, half-duplex
Transmission type
Digital binary serial
Data speed (baud rate)
4800/9600/19200/38400 bit/sec
Character length
7/8 bit
Parity bit
Odd/Even/None
Stop bit
1/2 bit
(Data speed, character length, parity bit, and stop bit settings are made on the controlled device.)
Connector pin-out
Connector
D-sub 9-pin female (unified screw thread)
Terminal pin-out and input/output signals
Pin no.
In/Out
Signal name
Description
1 -
NC
Not
connected
2
In
Rx Data
Data received at this pin *1
3
Out
Tx Data
Data transmitted from this pin
4 Out
(Reserved) Reserved
5 -
GND
Ground
6 In
(Reserved)
Reserved
7
Out
RTS
Request To Send (output "request to transmit") *2
8
In
CTS
Clear To Send (input "ready to receive") *2
9 -
NC
Not
connected
*1
：
A voltage that satisfies the RS-232C specification must be applied to Rx Data.
*2
：
RTS/CTS is loopback-connected within the controlled device. If using RTS/CTS control, consider the
design of the external controller.
