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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