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8-3. VISCA Communication Formats
8-3-1. VISCA Packet Structure
The basic unit for VISCA communications is the packet ( shown in Fig. 8-6. ). The first byte 1 in the packet is the header. It contains the sender
and destination addresses.
For example, the header for a packet sent from the computer at address 0 to EVI-D30/D31 at Address 1 is 81H (
hexadecimal ).
A packet sent to EVI-D30/D31 at Address 2 has a header of 82H. In the tables after pages, the header is listed as 8X. Insert the EVI-D30/D31
address in place of the X. The header for a packet sent in response from the EVI-D30/D31 at Address 1 is 90H. For a response packet form the
EVI-D30/D31 at Address 2, the header is AOH.
Some of the EVI-D30/D31 setting commands can be sent to all the equipment at one time
( broadcast ). For a broadcast, the header is 88H.
The terminator, FFH, ends the packet.
Packet (3 to 16 bytes)
Message
(1 to 14
bytes
ge (
yes)
ae
Packet
a
Moe
source
7
address
a] destination pore
a
RP RESER
SER
ast
'es
Seah TM
Bit7
Bité
Bit5 Bit4 Bt3
Bit2
Bit1
Bito
iS) Bité BitS
Bit4 Bit3 Bite a (SB)
(MSB)
(LSB)
(MS
yo
Fig. 8-6. VISCA Message Packet
8-3
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