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8. VISCA COMMAND LIST
8-1. VISCA Summary
EVI-330V/33 l V uses a protocol called VISCA. In VISCA, the computer or other device issuing the
commands is called the controller and the EVI-330V/331V or other device receiving those commands is
called the peripheral device. Under VISCA, up to 7 EVI-330V/331V can be connected to one controller
using RS-232C communications. The RS-232C parameters are communications speed of 9600 baud.
data
length of 8 bits, 1 stop bit, 1 start bit, and no parity. Flow control, such as XON/XOFF and
RTS/CTS, is not used. The EVI-330V/331V are connected in a daisy chain. The actual internal
connections form a one-way ring, as shown in the figure below, so messages pass through all the EVI-
330V/331V and return to the controller. Each device has an
address on this network.
The
address of the
controller is always 0. The addresses of the EVI-330V/331V are numbered l, 2, 3, etc., in order from
closer to the controller to farther away. As part of the initialization operations, the controller sends the
address command (seepage 8) to set the addresses for the EVI-330V/331V.
VISCA Equipments
, VISCA Controle r
IN
OUT
IN
OUT
IN
OUT
J
I
h
j I
,--)
I""°"'
,,....
./
j
'-
~
J I
'-
./
-
-
Figure 1. VISCA Network
EVI-330V/331V has a VISCA IN port and a VISCA OUT port. As viewed from the outside, both the
VISCA IN and VISCA OUT ports have the connector pin layout shown in Figure 2. During control by a
computer, set the EVI-330V/331V DTR input ( the computer's DSR output) high.
1. DTR
2.USFr
3.
TXD
4.GND
s.mm-
6. GND
7. OPEN,
8. OPEN
Data Transmission Ready (OUTPUT)
Data Set Ready (INPUT)
Transmit Data (OUTPUT)
Ground
Receive Data (INPUT)
Ground
Not Used
Not Used
Figure 2. VISCA Connector
8-1
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