Channel list parameter for remote commands
The channel list parameter is a string-type parameter that is used when controlling the relays of the
Series 3700A 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 channel patterns (on page 5-19).
• The string may contain a single channel, channel pattern, or analog backplane relay, as well as
multiple ones that are indicated by a range or 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 channels 1 and 3 of slot 1, use ("1001, 1003") for
the channelList parameter.
• To perform an open or close operation on all channels within the range of channels 1 through 5 of
slot 1, use ("1001:1005") for the channelList parameter
Queries that return a list of channels
For queries that return a channel list parameter, a channel configured for 4-pole operations will
indicate the paired channel in parentheses. For example, if channel 3003 on a 60-channel card is
configured for 4-pole, its paired channel is 3033. Notice the response to the query in the code
example below:
channel.close('3003')
print(channel.getclose('slot3') ï‚® 3003(3033)
Return value
Several of the channel functions return a value for specified channels and channel patterns.
The return value for these functions is a string containing a list of comma-delimited return items. The
channelList argument of the remote command determines the number and order of these returned
items.
When the channelList parameter for these functions is "slotX", the response first lists the
channels starting from lowest to highest. More specifically, the channels are returned in numeric
order.
When the channelList parameter for these functions is "allslots", the response starts with slot
1 and increases to slot 6 for the Series 3700A. Each slot is processed completely before going to the
next. Therefore, all slot 1 channels are listed before slot 2 channels.
When the response is numeric, but in string format, use the tonumber() function to convert the
string to a number. For example, sending these commands:
x = tonumber("1403")
print(x)
Results in:
1.403000000e+03
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