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Group IDs
Group IDs are logical IDs which are created by a call to
e1432_create_channel_group. This function can be called multiple times to
create multiple groups, and each group can contain any combination of
channels, including mixtures of different types of channels. The channel
groups can overlap as well.
This function creates and initializes a channel group. A channel group
allows you to issue commands to several HP E1433A channels at once,
simplifying system setup. The state of an individual HP E1433A channel
that is in more than one channel group, is determined by the most recent
operation performed on any group to which this channel belongs.
If successful, this function returns the ID of the group that was created,
which is then used to reference the channel group in most other functions
in this library. A group ID is always negative.
As a side effect, this function makes all input channels in the channel group
active, and all source and tach channels in the channel group inactive.
Unlike the HP 1431A library, this function does not inactivate other
channels within the modules that the channels are in. Also unlike the HP
1431A library, this function does not preset the channels in the new group.
As an example, to create a group consisting of the first three input
channels and the eighth and ninth input channels, the code would like
something like this:
SHORTSIZ16 chan_list[5];
SHORTSIZ16 input_group;
chan_list[0] = E1432_INPUT_CHAN(1);
chan_list[1] = E1432_INPUT_CHAN(2);
chan_list[2] = E1432_INPUT_CHAN(3);
chan_list[3] = E1432_INPUT_CHAN(8);
chan_list[4] = E1432_INPUT_CHAN(9);
input_group = e1432_create_channel_group(hw, 5, chan_list);
To create a group consisting of the first two source channels, the code
would look something like this:
SHORTSIZ16 chan_list[2];
SHORTSIZ16 source_group;
chan_list[0] = E1432_SOURCE_CHAN(1);
chan_list[1] = E1432_SOURCE_CHAN(2);
source_group = e1432_create_channel_group(hw, 2, chan_list);
HP E1433A User's Guide
The C-Language Host Interface Library
4-12