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VISCA Communication Specifications

VISCA packet structure

The basic unit of VISCA communication is called a packet (Fig. 2). The first byte of the packet is called the

header and comprises the sender's and receiver's addresses. For example, the header of the packet sent

to the unit (address 1) from the controller (address 0) is 81H in hexadecimals. Packet sent to the unit

(address 2) is 82H.

In the command list, as the header is 8X, input the address of the unit to X. The header of the reply

packet from the unit assigned to address 1 is 90H. The packet from the unit assigned to address 2 is A0H.

Some of the setting commands can be sent to all devices at one time (broadcast) *.

In the case of broadcast, the header should be 88H in hexadecimal.

When the terminator is FFH, it signifies the end of the packet.

* The broadcast function is not available for VISCA over IP.

Header

Sender's

address

Note

Fig. 2 shows the packet structure, while Fig. 3 shows the actual waveform. Data flow will take place with

the LSB first.

Packet (3 to 16 bytes)

Message (1 to 14 bytes)

Byte 1

Byte 2

Receiver's address

Fig. 2 Packet structure

Start

bit

Fig. 3 Actual waveform for 1 byte.

Byte 3

1 byte

Terminator

Stop

bit