Sony SRG-300SE Manuel technique - Page 17

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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 SRG assigned

address 1 from the controller (address 0) is 81h in hexadecimal. The packet sent to the SRG assigned address 2 is

82h. In the command list, as the header is 8X, input the address of the SRG to X. The header of the reply packet

from the SRG assigned address 1 is 90h. The packet from the SRG assigned address 2 is A0h.

Some of the setting commands for SRG 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.

Header

Sender's

address

Bit 7

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

(MSB)

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

Byte 3

Receiver's address

(LSB)

Fig. 2 Packet structure

1 byte

Start

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

bit

(LSB)

Fig. 3 Actual waveform for 1 byte.

Terminator

Bit 7

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

(MSB)

Stop

Bit 6 Bit 7

bit.

(MSB)

Command List

(LSB)