EXFO IQS-600 Integrated Qualification System - Manual (Page 143)

Preparing for Automation
Integrated Qualification System 135
Linking Units with the Serial Port
Linking Units with the Serial Port
Your IQS-600 Integrated Qualification System is equipped with a serial
(RS-232) port to send and receive data. Refer to the Microsoft Windows
documentation for information about serial port settings and possibilities.
Getting Optimum Performance from Your
Integrated Qualification System
Several factors influence the data transfer rate of an IQS controller unit. The
information presented hereafter will help you get the best transfer rate
possible.

Protocol (GPIB control only): You can use the IEEE 488.1 (standard) or
the HS488 (high-speed) protocol. Both protocols can co-exist in the
same system; communication between devices can then be achieved
using the IEEE 488.1 protocol.
HS488 is a non-interlocked handshake protocol that allows data
transmission between devices at higher rates (six to seven times faster
for small systems) than those possible with the IEEE 488.1 protocol.
Higher transfer rates are particularly interesting in systems containing
devices that return long data blocks. However, the transfer rate is
affected by the physical limitations of the cables used in the system.