To address specific channels within a multiplexer module in a switchbox or scanning voltmeter configuration, you must send the appropriate SCPI command string with a specified card number (cc) and channel number (nn). The card number refers to the multiplexer module within a switchbox or scanning voltmeter configuration. The multiplexer module with the lowest logical address in a VXIbus instrument is card number 01, and the next consecutively numbered multiplexer module is card number 02. If you have more than one switchbox or scanning voltmeter configuration, the card numbering sequence starts at 01 for each configuration. A channel address is, therefore, a four digit number (ccnn). For channel 07 on card 02 the address is 0207. You can delete leading zeros, so 207 is also a valid channel address. The channel address <channel_list> is in the form:

(@ccnn) for a single channel;

(@ccnn,ccnn) for multiple channels;

(@ccnn:ccnn) for sequential channels;

(@ccnn:ccnn,ccnn:ccnn) for groups of sequential channels.

The OPEN and CLOSe commands should only be used with the single-channel format and for one unique application of the multiple-channel format. You can close a channel on two different cards in the same instrument (e.g., 102 and 208) at the same time. You cannot close two channels on the same card at the same time (102 and 108). Closing a channel automatically opens all other channels on that card.

CLOSe (@102,208,309)

Closes 02 on card 1, 08 on card 2

 

and 09 on card 3.

CLOSe (@103,204)

Opens 102 and 208, closes 103 and

 

204; 309 left closed.

30 Using the HP E1351A/53A FET Multiplexer Modules

Chapter 3