Pioneer PRV-LX1 manual 4.0Command Block Format

Models: PRV-LX1

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4.0Command Block Format

PRV-LX1 RS-422A Protocol

4.0Command Block Format

The controlling device and the PRV-LX1 communicate through the interchange of command blocks. The bytes in each command block are assigned as follows:

CMD-1

 

Data

CMD-2

Data-1

 

Data-15

Checksum

 

Count

 

(MSD)

 

(LSD)

 

 

 

(MAX)

 

 

 

 

 

 

 

 

1

Byte

1 Byte

1 Byte

 

1 Byte

1 Byte

CMD-1/DATA COUNT CMD-1 is the upper 4 bits, DATA COUNT is the lower 4 bits

CMD-2

DATA-1 up to DATA-N, where n is the value in data count

CHECKSUM

CMD-1

Indicates the function and direction of the command:

0System Control (Controller -> PRV-LX1)

1Return for 0, 2, or 4 of cmd-1 (PRV-LX1-> Controller)

2Transport Control (Controller -> PRV-LX1)

4Preset/Select Control (Controller -> PRV-LX1)

6Sense Request (Controller -> PRV-LX1)

7Sense Returned (PRV-LX1-> Controller)

E PRV-LX1 Original Command (Controller -> PRV-LX1) F PRV-LX1 Original Return (PRV-LX1->Controller)

DATA COUNT

Indicates the number of bytes (maximum 15) inserted between CMD-2 and CHECKSUM

CMD-2

Designates the command

(refer to the Command Table for definitions)

DATA-1 to DATA-N

Data that corresponds to those indicated by the command (refer to the Command Table for data formats)

CHECKSUM

Lower eight bits of the sum of the bytes in the command block

Communications Protocol

The controlling device initiates the communication. PRV-LX1 returns a response within 9 milliseconds. The response may be:

• NAK + Error Data

: undefined command or communications error

• COMMAND + Data

: received a command that requests data

• ACK

: received a command that requests no data

 

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Pioneer PRV-LX1 manual 4.0Command Block Format