Measurement Computing Parallel488 - Manual (Page 27)

Section 4 IEEE to Parallel Operation
4.3
a logic "1" when there is 1024 or less locations in the buffer for data. It is
cleared, set to a logic "0", when there is greater than 2048 locations available.
This bit is referred to as the IEEE input buffer FULL bit.
4.3 Serial Poll Status Byte Register
The following shows and describes the serial poll status information provided by
the Parallel488.
Serial Poll Status Byte
Not Used - Al
ways '0'
DIO8 DIO7 DIO6 DIO5 DIO4 DIO3 DIO2 DIO1
1 4 2 8 16 32 64 128
IEEE Input Bu
ffer Empty
Not Used - Al
ways '0'
IEEE Input Bu
ffer Full
Not Used - Al
ways '0'
Not Used - Al
ways '0'
Not Used - Al
ways '0'
Not Used - Al
ways '0'
DIO8 Not Defined - Always "0"
DIO7 rsv - Always "0"
This bit is defined by the IEEE 488 Specification and is used to
indicate to the bus controller which device requires service. This bit
is not supported by the Parallel488.
DIO6 Not Defined - Always "0"