Models 707B and 708B Switching Matrix Reference Manual
Section 2: General operation
707B-901-01 Rev. A / August 2010
2-89
Channel list parameter for remote commands
The channel list parameter is a string-type parameter that is used when controlling the relays of the
Model 707B or 708B using a remote command interface. You can specify a list of individual channels
or a range of channels in the channel list parameter.
In the command descriptions, the channel list parameter is shown as
channelList
.
When sending this parameter:
•
Enclose the contents of the channel list in either single (') or double (") quotes. The beginning and
end quotes must be the same style.
•
Use a comma or semicolon to separate the channel list or
•
The string may contain a single channel, single channel pattern, multiple channels, or multiple
channel patterns that are comma-delimited.
•
Use a colon between the start and end channel to specify a range of channels. The lowest
channel must be first and the highest last.
Examples:
•
To perform an open or close operation on row 1 and columns 3 and 5 of slot 1, use ("1A03,
1A05") for
channelList
.
•
To perform an open or close operation on all channels in the range of row 1 and columns 1
through 5 of slot 1, use ("1A01:1A05") for
channelList
.
Queries that return a list of channels
For queries that return a channel list parameter, the Model 707B or 708B separates the channels by a
comma or semicolon, depending on the command. When multiple channels are used in the query, the
information for the lowest numbered channel is listed first, increasing to the highest numbered
channel.
When multiple slots are used in the query, the information for the lowest slot number is listed first and
increases to the highest slot and channel.
Connection methods for close operations
You can dictate the order in which relays are opened and closed using the channel connection rule.
WARNING
When the connection rule is set to break before make, the instrument ensures that all switch
channels open before any switch channels close. This behavior covers the most common
applications and is considered the safest connection rule because the tested device is
completely decoupled from the instrument. This is the default behavior. When switch channels
are both opened and closed, this command executes not less than the addition of both the
open and close settle times of the indicated switch channels.
