User manual

Section 8: Scanning Series 3700 System Switch/Multimeter Reference Manual
8-2 3700S-901-01 Rev. C / July 2008
Channel assignments
Each switching module has a certain number of channels. For example, the
Model 3720 switching module has 60 channels (1 through 60). When you
encounter a 1- to 3-digit channel number in this manual, the switching module
channel is the point of discussion. A 4-digit channel number includes the slot
number followed by the 3-digit channel number.
A switching module can be installed in any of the mainframe's six slots.
Therefore, to close, open, or scan a channel, you must specify the slot location
and channel number of the switching module by using a four-digit channel
number for the mainframe. The first digit (1, 2, 3, 4, 5, or 6) indicates the slot
number, and the next three digits indicate one of the following:
The MUX (multiplexer) channel notation
The row and column of matrix card notation
The modules' backplane relay notation
Events
Event detectors monitor an event. They have one input signal (the stimulus),
which is the event that they monitor (in some cases, the stimulus is an action in
the system, like a timer expiring or a key press). They have two optional output
signals (see figure below). "Detected" reflects the detection state of the event
detector. If an event was detected, the detected signal is asserted. Event
detectors are usually coupled to something that consumes the events. When an
event is consumed, the detected state of the event detector is reset. Should an
event be detected while the event detector is in the detected state, the overrun
signal will be asserted. You can only clear the overrun signal by sending an ICL
command.
Figure 8-1: Event detector