HP 82479A Owner's Manual page 55

Keywords
3.4 INTERRUPT SUBPROGRAMS
Three BASIC subprograms provided in the LITIL. ITY file may be used for convenient interrupt
programming. They are:
MONLOW
CHLL MOHLOW YC channel numbers errorcode
The parameters are as follows:
channel number - an HP 3421A channel number (range = 00 - 29).
errorcode — Returns 0 if there were no errors, or the number of the error generated.
This subprogram sets up the HP 3421A to source a service request (SRQ) when the specified input channel
goes low and waits for the SRQ.
MONHIGH
CHLL MOMHIGHC channel numbers errorcode
The parameters are as follows:
channel number - an HP 3421A channel number (range = 00 - 29).
errorcode - Returns O if there were no errors, or the number of the error generated.
This subprogram sets up the HP 3421A to source a service request (SRQ) when the specified input channel
goes high and waits for the SRQ.