Interface Specifications; 9-Pin Connector; Data Format; Communication Protocol - Sony SVT-RS1A Operating Instructions Manual

Interface Specifications

9-Pin Connector

Signal Function
Pin No.
3 TXD Transmit data
RXD
2 Receive data
4 DTR Data terminal Ready
GND
5 Ground
Use the cross cable for communication.

Data Format

Mode: asynchronous
Character length: 8 bits
Data transfer rate: 1200/2400/4800/9600 bps
(set with menu)
Parity check: None
Stop bit: 1 bit

Communication Protocol

Communication between the computer and the VCR is
carried out one byte at a time. The computer sends one
byte, waits for the VCR to respond, then sends the next
byte. The response from the VCR may not be a single byte
but may be comprised of several bytes, such as six bytes
for a counter value. For commands, such as EJECT, which
take time to be executed, the VCR returns a response on
receiving the command, then sends another response after
executing the command.
Signal flow
VCR to computer
Computer to VCR
VCR to computer
EN
11