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HP E1433A User's Guide
The
Multiple-module/Mainframe Measurements
Grouping of Channels/Modules
The interface library for the HP E1433A is designed to allow programming of several channels from one or several distinct modules, as if they were one entity. Each HP E1433A module has up to 16 channels. The library may control up to a maximum of 255 HP E1433A modules (8160 channels).
When initializing the interface library, all module logical addresses are passed in the call to e1432_assign_channel_numbers. This function associates a logical channel ID with each channel. From then on, library functions use these logical IDs rather than the logical address.
The function e1432_create_channel_group can be used to declare any number of groups of channels, possibly overlapping. Each group can be uniquely identified by a group ID.
The ‘target’ of a library function is either a channel, a group, or (rarely) a module, depending on the nature of the call. When the same library function may be called with either a channel or a group identifier, it’s ‘target’ is shown by a parameter named ID.
Multiple-module Measurements
A channel group that spans more than one module will need to be configured to use the TTL trigger lines on the VXI Bus for
e1432_init_measure call unless defeated using e1432_set_auto_group_meas.
The following discussion outlines what e1432_init_measure does automatically. This must be done by the user if
e1432_set_auto_group_meas has been used to defeat auto configuration.
There are eight VXI TTL trigger lines that can be used for