TASCAM CD-RW901 RS-232C Protocol Specification
1 TEAC Corporation
1. Overview
The CD-RW901's REMOTE connector can be used to control the CD-RW901 from a computer or
other external device. In this document, the CD-RW901 is referred to as the "controlled device,"
and the external device that controls it is referred to as the "external controller."
2. Specifications
2.1. 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 When measured with an applied voltage of between ±3 and 15V, the DC
resistance is between 3KΩ and 7KΩ.
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 When the open circuit voltage at the receiver is 0V, the signal voltage is
between ±5V and ±15V for a load impedance of between 3K and 7KΩ.
Signal discrimination Logical “1” Less than -3V
Logical “0” More than +3V
2.2. 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 CD-RW901.)
2.3. Connector pin-out
Connector D-sub 9-pin female (metric 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.
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