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Overview
About This Document
This document describes the specifications of
the VISCA command, CGI command, and RTSP
streaming of Sony color video camera SRG-A40,
SRG-A12. In this document, the product is
referred to as "the cameras."
VISCA
1)
VISCA
is a protocol developed by Sony for
controlling a consumer's camcorder.
Overview of VISCA
In VISCA, the side outputting commands, such as
a computer, is called the controller, while the side
receiving the commands, such as a SRG-A40/
2)
A12
, is called the peripheral device. In VISCA, up
to seven peripheral devices including this
camera can be connected to a single controller
using communication conforming to the RS-422
standard. The parameters of RS-422 are as
follows.
• Communication speed: 9600 bps/38400 bps
• Data bits : 8
• Start bit : 1
• Stop bit : 1
• Non parity
Flow control using XON/XOFF and RTS/CTS, etc.,
is not supported.
Peripheral devices are connected in a daisy
chain. As shown in Fig. 1, the actual internal
connection is a one-direction ring, so that
messages return to the controller via the
peripheral devices. The devices on the network
are assigned addresses. The address of the
controller is fixed at 0. The peripheral devices are
assigned to the addresses, 1, 2, 3... in the
connected order, starting from the one
connected nearest to the controller. These
addresses are set when the controller sends
address commands during initialization of the
network.
...................................................................................................................................................................................................
1) "VISCA" is a trademark of Sony Corporation.
2) The product name of this camera, "Color video camera SRG-A40/A12" is referred to as "the camera" in this
document.
Note
Each VISCA equipment has VISCA IN and VISCA
OUT connectors.
Set the DTR input (the S output of the controller)
of VISCA IN to H when controlling VISCA
equipment from the controller.
Fig. 1 VISCA network configuration
3
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