EXFO IQS-600 Integrated Qualification System - Manual (Page 140)

Preparing for Automation
132 IQS-600
Preparing Hardware for GPIB Control
Preparing Hardware for GPIB Control
If you intend to use GPIB to remotely control your instruments, your
controller must have been equipped with the optional GPIB card.
To ensure the optimum efficiency of your system, EXFO recommends that
you follow these restrictions:
For the IEEE 488.1 protocol:

Maximum of 15 devices physically connected to each GPIB bus.

Maximum separation of 4 m between two devices and an average
separation of 2 m over the entire range (bus).

Maximum total cable length used in the system is 20 m.

At least two-thirds of the connected devices must be turned on.
For the HS488 protocol:

Maximum of 15 devices physically connected to each GPIB bus.

Maximum total cable length used in the system is 15 m (that is, 1 m per
device physically connected to the GPIB bus).

All connected devices must be turned on.

For each meter of cable used in the system, there must be a device
connected to it or an equivalent device load.