EXFO IQS-600 Integrated Qualification System - Manual (Page 144)

Preparing for Automation
136 IQS-600
Getting Optimum Performance from Your Integrated Qualification System
For information on cabling, see Preparing Hardware for GPIB Control on
page 132.

Bus timing (GPIB control only): Required if you intend to work with
IEEE 488.1, for it affects the handshake rate of this protocol. It indicates
the minimum amount of time a GPIB controller waits, once data is
placed on the bus, before setting the data valid bus line (DAV) to true.
The possible bus timings are:
If your setup supports it, select the very-high-speed timing to get the
best performance.

Output unit (GPIB, RS-232, ActiveX and TCP/IP): The IQS controller
unitcan return results in

linear units (for example, watts)

log units (for example, dBm)
Since internal units are linear, you will get optimal performance by
using linear units for output (no need for an internal conversion to log).
Note: You must make the choice of output unit for each instrument offering such
a feature. Refer to the user guide of each optical instrument for a list of
available commands and queries.
Mode Bus timing delay
Normal 1100 ns
High speed 500 ns
Very high speed 350 ns