Agilent Technologies manual L4400 Series Channel Addressing Scheme

3Operating and Programming

must be used when connecting the L4400 instrument directly (without a switch or router) to the computer. See “Connecting the LAN Cables” in Chapter 2 for more information.

L4400 Series Channel Addressing Scheme

The channel addressing scheme for the L4400 series LXI instuments uses the form 1ccc where ccc is the three- digit channel number. Following are examples of the scheme. Refer to the individual instrument chapters for more information on channel numbering.

Table 3-2. L4400 Series Channel Addressing Examples.

Channel Number	Definition
1014	Channel 14 on Bank 1 of the L4421A multiplexer module.
1921	Channel 921 (analog bus relay for ABUS 1) on Bank 2 of the
	L4421A multiplexer module or on Matrix 2 of the L4433A matrix
	module.
1304	Row 3 / column 4 on Matrix 1 of the L4433A matrix module
	(2-wire mode).
1437	Row 3 / column 7 on Matrix 4 of the L4433A matrix module
	(1-wire mode).

1201

Channel 201 on Bank 2 of the L4450A digital I/O module.

Introduction to the SCPI Command Language

The functions of the L4400 series instruments are programmed using SCPI (Standard Commands for Programmable Instruments) commands. The L4400 Programmer’s Reference located on the L4400 LXI Class C Instruments Prod- uct Reference CD- ROM (p/n 34989- 13601), contains a complete description of each instrument’s command set.

SCPI is an ASCII- based instrument command language designed for test and measurement instruments. SCPI commands use a hierarchical structure, also known as a tree system. In this system, associated commands are grouped together under a common node or root, thus forming subsystems. A portion of the ROUTe subsystem is shown below to illustrate the tree system.

ROUTe

:MONitor

[:CHANnel]:ENABle <mode>, (@<ch_list>)

[:CHANnel]:ENABle? (@<ch_list>)

52 L4400 User’s Guide