Agilent Technologies 85330A Definition of Terms, SCU address, Channel, Switch address

Programming

Definition of Terms

NOTE

NOTE

Please review the following terms before reading information in this chapter.

SCU address

At the factory, each Switch Control Unit is assigned an address called an SCU address. When commands are sent out port 1 or port 2, they only affect SCUs with the specified SCU address. SCU addresses are set using DIP switches inside the SCU, and can be set to 0, 1, 2, or 3. In a standard system, the factory default setting is 0. For custom-designed systems, refer to the documentation that came with that system for SCU address numbers. Daisy-chained SCUs may use the same SCU address.

Channel

Each switch module has either two or four possible switch positions, or channels. If you purchased a switching system designed by Agilent, you also have received a manual that applies specifically to that switch tree. That document shows the channel numbers for each switch. If you have purchased a “standard” system, then channels 1 through 4 are the factory default channel numbers. (Channels 3 and 4 only apply to four-throw switches.)

Ports 1 and 2 are addressed independently. Because of this, there are no addressing conflicts when using two SCUs—even if they use the same SCU address and channel numbers.

Switch address

This is the complete software address for a specific switch. It is simply a concatenation of the SCU address (0, 1, 2, or 3) with the channel number (usually 1, 2, 3, or 4, but possibly a number up to 64 in custom systems).

Examples:

@103 = SCU address 1 and channel 3 selected.

@2 = SCU address is 0 (and need not be specified), and channel 2 is selected.

@232 = SCU address is 2 and channel 32 is selected (custom systems only).

The port number (1 or 2) is specified separately, as is explained later in this chapter.

6-2 85330A Multiple Channel Controller