Vaddio Sony BRC-H700 User Manual download pdf (Page 4)

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 BRC-H700 assigned address 1 from the

controller (address 0) is hexadecimal 81H. The packet

sent to the BRC-H700 assigned address 2 is 82H. In

the command list, as the header is 8X, input the

address of the BRC-H700 at X. The header of the reply

packet from the BRC-H700 assigned address 1 is 90H.

The packet from the BRC-H700 assigned address 2 is

A0H.

Some of the commands for setting BRC-H700 units

can be sent to all devices at one time (broadcast). In

the case of broadcast, the header should be

hexadecimal 88H.

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

packet.

Timing Chart

As VISCA Command processing can only be carried

out one time in a Vertical cycle, it takes the maximum

1V cycle time for an ACK/Completion to be returned.

If the Command ACK/Completion communication

time can be cut shorter than the 1V cycle time, then

every 1V cycle can receive a Command.

From this point, if 2 or more commands in a row are to

be sent, wait for the first command (for normal

commands, an ACK or an error message, for query

commands, an Inquiry Packet) to be carried out before

sending the next one.

Query Commands

Command

Within16.7msec(20msec*50i)

RxD

TxD

ACK Completion

16.7msec(20msec*50i)

RxD

TxD

Inquiry Pocket

Command

General Commands

16 Byte

Fig. 2 Packet structure

Bit 7

(MSB)

Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0

(LSB)

Bit 7

(MSB)

Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0

(LSB)

11111111

Packet (3 to 16 bytes)

Message (1 to 14 bytes)Header

Terminator

Byte 1 Byte 2 Byte 3

Sender’s

address

Receiver’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.

Bit 0 Bit 1 Bit 2 Bit 3 Bit 4 Bit 5

(LSB)

(MSB)

Bit 6 Bit 7

Fig. 3 Actual waveform for 1 byte.

Start

bit

Stop

bit.

1 byte

1 2 3 4 5 6 7 8 9 ... 25 26

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Vaddio Sony BRC-H700 User Manual Page 4

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