Detailed Descriptions of Commands

VTR Return Commands

When the VTR receives a command from the computer, it returns a VTR return command. The HSR-1/1P supports the following commands.

NOT TARGET (05H)

Notifies that the VTR could not find the specified position on the tape when executing the T/D SEARCH or ALARM SEARCH command.

ACK (0AH)

ACK is returned when the VTR receives the defined command correctly. When the command from computer requests STATUS SENSE or other data, ACK is not returned, but only data is returned.

NAK (0BH)

NAK is returned if a command which is not defined for the current mode (for example, a numerical value command in a mode other than the numerical input mode) is received, or when a communication error is detected.

COMPLETION (01H)

COMPLETION is returned when the VTR has completed the operation of the T/D SEARCH or ALARM SEARCH command. The COMPLETION command will not be returned if the VTR receives a tape-run-related command or the C.L. command before completion of the above commands, because the VTR stops executing the above commands to execute a new command.

ERROR (02H)

Notifies of generation of an error during operation. ERROR is returned when a VTR receives a command that cannot be executed because of an error, such as tape slack, etc., or when an error has occurred during execution of the T/D SEARCH or ALARM SEARCH command, and stopped the operation. Remove the cause of the error and release the error status using the C.E. and C.L. commands.

CASSETTE OUT (03H)

Notifies that the cassette was ejected.

ALARM IN (06H)

Notifies of alarm input. Each time an alarm is generated, this command is issued. Which channel is in alarm status can be confirmed by using the ALARM SENSE (DAH+C4H) command.

Numerical Value Commands

The numerical value commands are used to specify numerical parameters. These commands are also used when returning numerical data, such as time data, from the VTR to the computer. The following four command formats are supported:

Numerical value commands 0 to 9 (30H to 39H)

To express numerical values 0 to 9 for each command.

Numerical value commands A to F (3AH to 3FH)

To express numerical values A to F for each command.

Sign (+) command (A1H) and sign (–) command (A2H)

Used to specify the sign of numerical data.

ENTER (40H)

Used to specify completion of numerical parameter input.

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