Agilent Technologies L4400 manual Simple Switch Control, Channel drive back on

7Microwave Switch/Attenuator Driver

Simple Switch Control

All examples in this chapter make reference to SCPI commands for switch control. The L4445A commands are summarized in Table 7- 1. For more information, refer to the Programmer’s Reference help file included on the Product Reference CD- ROM (p/n 34989- 13601).

The switches and attenuators are designed to respond to the SCPI ROUTe:CLOSe and ROUTe:OPEN commands. For example, to open and close a switch attached to channel 1 on bank 1 of the second remote module attached to the L4445A, you could use the following commands (rem = 2, channel = 01).

ROUT:OPEN (@1201)

ROUT:CLOS (@1201)

Before you can close or open a switch, however, several other parameters must be configured. Each distribution board has a set of factory default parameters designed to support the type of switches intended to be present. These defaults are described in more detail on page 152. Additionally, the drive current source must be selected and configured.

The following commands show a simple sequence controlling channel 1 of an Agilent N1810 switch (installed on a Y1150A distribution board) of the third remote module attached to a L4445A (rem = 3, channel = 01). Note that ALL 34945EXT modules are reset by the first command shown.

SYST:RMOD:RES 1

ROUT:RMOD:BANK:PRESET BANK1,(@1300)

ROUT:CHAN:DRIV:CLOS:DEF (@1301)

ROUT:RMOD:DRIV:SOUR INT,(@1300)

ROUT:OPEN (@1301)

<--other commands -->

ROUT:CLOS (@1301)

In the example above, the SYSTem:RMODule:RESet command resets the module and disables all drive currents. The next command loads the factory default settings for the distribution board (Y1150A) used to support the Agilent N1810 switch. The default state of switch closed is then configured. When the drive source is set to internal (third remote module only), the switch assumes its default closed state. The configured switch may now be controlled using the ROUTe:OPEN and ROUTe:CLOSe commands.

N O TE	You must turn off the channel drive before sending the
	ROUTe:RMODule:BANK:PRESet command. Once configured, turn the
	channel drive back on
	(ROUTe:RMODule:DRIVe:SOURce:IMMediate).

These commands and settings are described in more detail later in this chapter and in the Programmer’s Reference Help file.

144 L4400 User’s Guide