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2 TEAC Corporation
1. Overview
You can control the HD-R1 from a computer or other external device using its RS-232C port. In this document,
the HD-R1 is the controlled device, and the external device that controls it is the control device.
2. Specifications
Electrical specifications
Applicable standard JIS X-5101 (equivalent to old JIS C-6361 and EIA RS-232C)
(Not compatible with RS-422A in commercial use VCRs and other equipment)
Receiver impedance 3 KΩ or more measured at applied voltage of ±3 – ±25 V
Sender open circuit voltage ±25 V or less
Receiver open circuit voltage ±3.3 or less
Signal discrimination Logic “1” +2 V or more
Logic “0” +0.8 V or more
Transmission specifications
Circuit format Three-wire, half duplex
Transmission format Digital binary serial transmission
Data signal speed 9600 bit/sec
Character length 8 bits
Parity bit None
Stop bit 1 bit
Note: The settings are fixed for the data signal speed, character length, parity bit and stop bit. The control device
must be adjusted to match the HD-R1 settings.
Pin configuration
Connector D-sub 9-pin female (inch screw thread)
Port pin allocations and input and output signals
Pin
number
In/Out
Signal
Description
1
-
NC
Not used
2
In
Rx Data
Receive data*
3
Out
Tx Data
Send data
4
-
NC
Not used
5
-
GND
Ground
6
-
NC
Not used
7
-
NC
Not used
8
-
NC
Not used
9
-
NC
Not used
*Raise the voltage of Rx Data to comply with the RS-232C standard.