Command List; Visca Rs-422 Commands - Sony SRG-300SE Technical Manual

VISCA RS-422
1)
Commands
Use of RS-422 control software based upon this
command list may cause malfunction or damage to
hardware and software. Sony Corporation is not liable
for any such damage.
Overview of VISCA
In VISCA, the device outputting the commands, for
example, a computer, is called the controller, while the
device receiving the commands, such as this unit, is
called the peripheral device. In VISCA, up to seven
peripheral devices can be connected to one
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 device address is assigned to each device on the
network. The address of the controller is fixed at 0.
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VISCA is a protocol developed by Sony for controlling a consumer's camcorder. "VISCA" is a trademark of Sony
1)
Corporation.

Command List

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.
Note
When connecting in a daisy chain using this unit, set the BAUD
RATE correctly.
In case that any device having different setting is connected in a
daisy chain, the devices do not operate correctly.
Fig. 1 VISCA daisy chain connection
VISCA Controller
VISCA Equipment
IN
OUT
IN
OUT
IN
OUT
1