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QL Series II DC Supplies: Digital Control

QL series rear panel

digital interfaces

Comprehensive digital interfaces for remote control

To meet the varying needs of today's engineers, a comprehensive array of interfaces is provided. RS-232, USB, GPIB and LAN (Ethernet) with LXI support are provided as standard.

Each of the digital bus interfaces provides full control of voltage, current, and output on/off, plus read-back of voltage, current and status. The interfaces are opto-isolated from the output.

Rear Terminals

Power and sense terminals are duplicated on the rear panel for rack mount applications and other situations where rear connection is more convenient.

Command Set and IVI Driver

The basic command set for the QL-P Series II is compatible with both the original QL-P series, the PL-P series and other TTi power supplies such as the CPX-P series.

An IVI driver for Windows is supplied. This provides support for common applications such as LabView* , LabWindows* and HP-VEE* .


An RS-232/RS-423 interface is provided for use with legacy systems. This type of serial interface remains in common usage and is perfectly satisfactory for the control of power supplies because data speed is not an issue.


USB provides a simple and convenient means of connection to a PC and is particularly appropriate for small system use.

A USB driver is provided suitable for Windows* systems.


The GPIB interface conforms with IEEE-488.1 and IEEE-488.2. GPIB remains a widely used interface in larger and legacy system applications.

LAN-Ethernet with LXI

The LAN interface uses a standard 10/100 base-T Ethernet hardware connection with ICMP and TCP/IP Protocol for connection to a Local Area Network or direct connection to a single PC.

This interface supports LXI and is the most appropriate for larger system use because of its scalable nature.

LXI Compliance

The LAN interface is compliant with LXI-C. LXI is the next-generation, LAN-based modular architecture standard for automated test systems managed by the LXI Consortium, and is expected to become the successor to GPIB in many systems.

Learn more about LXI (LAN eXtensions for Instrumentation) - the next generation Ethernet based bus interface for instrument applications.

* LabView and LabWindows are trademarks of National Instruments.
HPVEE (now Agilent VEE) is a trademark of Agilent Technologies.
* USB interface is supported for Windows 2000, XP, Vista and Windows 7. Further versions will be supported as they appear.
Windows is a trademark of Microsoft inc.