User`s manual

The Common Terminals also connect to the H, L, and G connections on the

Analog Bus Connector. The DT Tree Switch Terminals also connect to the

I+, I-, and IG connections on the Analog Bus Connector. The Analog Bus

Connector provides direct channel connections between multiple

multiplexer modules, and connections between a multiplexer module and

the Agilent E1326/E1411 Multimeter. Cables make the necessary

connections without the need to externally wire the multimeter/multiplexer

module to the terminal module.

Each Common and DT Tree Switch lines have a 100 Ω resistor in series

with each line. The resistors provide relay protection and are located on the

component module. The Analog Bus lines have jumpers in series that you

may remove to isolate the analog bus from the multiplexer module. The

Low (L) and Guard (G) commons are normally connected to each other

through isolation jumper JM1 (see Chapter 2). Remove the jumper to

minimize errors caused by lead resistance in the low lines. The jumper is

located on the component assembly.

Programming the Multiplexer Module

The multiplexer module is programmed either in a switchbox or scanning

voltmeter configuration. To program the multiplexer module using Standard

Commands for Programmable Instruments (SCPI), you must select the

controller language, interface address, and SCPI commands to be used. See

the "Agilent 75000 Series B Installation and Getting Started Guide" or the

"Agilent E1405/E1406 Command Module Manual" for interface addressing

and controller language information of multiplexer modules in a switchbox

or scanning voltmeter configuration.

Note This discussion applies to SCPI programming. See Appendix B

(48-Channel Relay Multiplexer Registers) for details on multiplexer module

registers.

Selecting Channels To address specific channels within a multiplexer module in a switchbox or

scanning voltmeter configuration, you must:

• send the appropriate SCPI command string to the switchbox or

scanning voltmeter (e.g., CLOSe, OPEN, etc.)

• specify the card number

• specify the channel number

Chapter 1 Getting Started with the Agilent E1346A 13