User manual

Part 6: IEEE 488.2 Command Reference
*PRE
Description
The *PRE command sets the PaRallel poll Enable register (PRE). The lowest eight bits of the Parallel Poll
Register (PPR) are composed of the STB bits. *PRE allows you to specify which bit(s) of the parallel poll
register affect the IST (Individual Status Bit).
The *PRE? query reads the contents of the PRE register. The response is a decimal number corresponding
to the binary sum of the register bits.
Command Syntax
PRE <value>
<value>:= 0 to 65535
Query Syntax
*PRE?
Response Format
*PRE <value>
Example (GPIB)
The following instruction causes the IST status bit to become 1 as soon as the MAV bit (bit 4 of STB,
meaning decimal 16) is set, and yields the PRE value 16:
CMD$="*PRE 16": CALL IBWRT(SCOPE%,CMD$)
Related Commands
*IST
6-139