HP 82479A Owner's Manual page 206

Alternative Peripheral Options
F.3 WORKING WITHOUT an HP 3421A
The programs = TREIF, MOMITORE, and SETLIF require that the HP 3421A be connected to the HP-71
in order to run. These programs call the subprogram CHAML IST (in the UTILITY file) to determine
which options are present in the HP 3421A (and thus the type of each channel). If the HP 3421A is not
available when a new setup is to be entered, such as in a production environment, the call to CHRMHL.IZT
may be intercepted by placing a temporary LHFHML IST substitute in main memory. The substitute will
describe the instrument to be used (although the Firm modules will not work).
The syntax for the subprogram is as follows:
CALL CHAML IST C digital cards, mux cards, channel array, errorcode
The digital cards variable returns the number of digital cards installed in the HP 3421A.
The mux cards variable returns the number of multiplexer cards installed in the HP 3421A.
The channel array 1s a numeric array which indicate the type of each channel in the HP 3421A. The
contents of this array are described below.
The errorcode 1s a number which is returned that indicates whether an error was encountered. This
number is returned as k if no error was found.
The channel array contains 30 elements, numbered kl to ='F. Each element in the array contains the type
of its corresponding channel in the HP 3421A. The types are:
Type Description
© The channel is empty.
1 The channel is an acquisition channel.
= The channelis a digital channel.
The channel is an actuator channel.
The following example subprogram could be used to simulate a HP 3421A with the following options
installed:
e Option 020 8 Channel Multiplexer/2 Channel Actuator Assembly in slot 0.
e Option 022 10 Channel Multiplexer Assembly in slot 1.
e Option 050 Digital I/O Assembly in slot 2.