11Automation Control Interface; Specification - HP LTO-4 Technical Reference Manual

11 Automation Control Interface

Specification

Physical interface
• RS-422, Drive Sense, Library Sense, Reset and Attention signals
• A default of 9600 baud at power-on, after a tape drive reset and after an ACI reset. After that,
the library can configure the tape drive to use other baud rates (19200, 38400, 57600 and
115200 baud for HP LTO Ultrium drives) using the Set Baud Rate command.
• 1 start bit, 8 data bits, 2 stop bits, no parity
Protocol
• Binary data packets, including checksum, packet length, status, sequence number,
• XON/XOFF flow control
• Positive or negative acknowledgement of transmission
• Constant polling not necessary—the drive returns status upon completion of each command
ACI command set
The following ACI commands are supported on HP LTO Ultrium drives:
Mandatory Commands
00h Get Drive Info
01h Load
02h Unload
03h Get Drive Status
04h Set Drive Configuration
05h Get Drive Configuration
06h Reset
07h Set Baud Rate
08h No Op
09h Get Error Info
0Ah Acknowledge Attention
Optional Commands
40h Send SCSI Command
42h Send Firmware Image
43h Get Firmware Segment
49h Get Buffer Size
4Ah Send Firmware Segment
4Bh Set Time
4Ch Get Time
HP LTO Ultrium 4 drives technical reference manual, volume 4: specifications
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