Publication No. 980855 Rev. A 1256 User Manual
EADS North America Test and Services SCPI Command Basics 5-37
Opening Relays
The OPEN command may be used to open channels. To say a
channel is open means:
a. The input of the channel is disconnected to the output
(Single-Pole Single Throw)
b. The input of the channel is disconnected from the “normally
open” output and connected to the “normally closed” output
(Single-Pole Double-Throw).
The syntax for the “
OPEN
” command is:
[:ROUTe]
:OPEN
<channel
list>
The format for a “<channel list>” is described in the previous
paragraphs of this section of the manual.
The OPEN? command may be used to query the present state of
the relays in the system. This command returns a reply of a
sequence of “0" and “1", each of which are separated by a single
ASCII space character. The value of the reply is “1" if the
corresponding relay is opened, or “0" if the corresponding relay is
closed.
Note that this is the opposite state from the
CLOSE?
query.
Checking for
Installed Plug-Ins
The MOD:LIST? command may be used to query the 1256 for the
types and slot numbers of the cards present in the system.
[ROUTe]
:MODule
:LIST? [module address]
As an example, if a 1256 contains a 1260-136A, 1260-167B, and a
1260-138 in slots 4, 7, and 8 respectively, supposing that the
following command was executed:
MOD:LIST?
the reply would be:
4 : 1260-136A HIGH CURRENT 1X42 (2X21)
MUX,7 : 1260-167B DUAL 1x6 RF SWITCHING
MODULE,8 : 1260-138 64-CHANNEL DPST 2A MUX
Individual slots can also be queried:
MOD:LIST?
(@7)
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