Read Position Command
August 2016 Commands 159
Read Position Command
The Read Position command returns information about the current logical and
physical block address of the tape. This command returns 20 or 32 bytes of data
depending on the service action.
TABLE 3-114 Read Position Command
Byte
Bit
76543210
0 Operation Code (34h)
1 Reserved Service Action
2
thru
6
(MSB)
Reserved
(LSB)
7
thru
8
(MSB)
Allocation Length
9 PPI Control Byte
Parameter Value
Service Action 00h = Return short form data (20 bytes)
01h = Return Short form data
02h = Return physical position indicator data (32 bytes) if PPI
=1
06h = Return long form data
Allocation Length 0000h = 20 or 32 bytes returned depending on service action
PPI: Physical Position Indicator 0 = Return Normal read position
1 = Return Physical Position Indicator data
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