EXFO LTB-8, User Manual

Page: 162 / 402

Preparing for Automation
154
LTB-8
Preparing Hardware for GPIB Control
Preparing Hardware for GPIB Control
If you intend to use GPIB to remotely control your instruments, you must
first connect the optional USB/GPIB adapter sold by EXFO.
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.