LOG SENSE 4Dh
Commands
63
Very High Frequency Data (VHF)
7 6 5 4 3 2 1 0
0 (MSB)
Parameter Code (0000h)
1 (LSB)
2 DU (0) DS (1) TSD (0) ETC (0) TMC (0) LBIN (1) LP (1)
3 Parameter Length (4h)
4 Rsvd (0) HIU MAcc Cmpr WrtP CRqst CRqrd DInit
5 InXtm Rsvd (0) RAA MPrsnt Rsvd (0)
MStd
MThrd DAcc
6 Tape Motion Status
7 Reserved (0)
RRqst
IntfC TAFC
HIU Host Initiated Unload bit
MAcc If set, the MAM is accessible. MPrsnt must be set as well.
Cmpr Compress bit. If set, the DTD currently has data compression enabled.
WrtP Write Protect bit. If set, the media in the DTD is physically write-protected. Only valid if
MPrsnt is set.
CRqst Clean Requested bit
CRqrd Cleaning Required. If set, head cleaning must be performed before normal data
operations are possible. This takes priority over CRqst, and both may be set at the
same time.
DInit DTD Initialized. When set, the data returned by the VHF parameter data is valid.
InXtn In Transition. If 0, the DTD is in the state reflected by the rest of byte 5 and is not
attempting to leave this state. This bit must be 0 if RRqst is set.
RAA Robotic Access Allowed. If set, robotic media access to the DTD is allowed.
MPrsnt Media Present bit (hardware sensor)
MStd Media Seated. If set, the tape is mechanically seated, that it physical loading is
complete. Otherwise the tape is still threading.
MThrd Media Threaded
DAcc Data Accessible. If set, the DTD has finished processing a load operation. The bit is
cleared to 0 at the beginning of the next unload operation.
Tape Motion
Status
00h
01h
02h
03h
04h
05h
06h
07h
08h
09h–7Fh
80h–FFh
No tape motion
Cleaning operation in progress
Tape being loaded
Tape being unloaded
Tape in motion
Reading
Writing
Locating
Rewinding
Reserved
Vendor unique
