Key Digital ES381 - Manual (Page 14)

2.3.2 Non-Stacked (MIS) Mode
It is also possible to use multiple USBcount50s as independent
instruments. In this mode, the counters are NOT connected together
via the stacking interface
4 .
This configuration is also termed Multi-Instrument mode or MIS
mode.
In MIS mode, each counter can use its own timebase setting, and
each counter input will remain electrically isolated from the others
(unless you connect their BNC grounds together).
2.3.2.1 USB Connections For Non-Stacked Configurations
All counters need a USB connection. A standard hub may be
useful for multi counter use to get enough USB ports.
Each counter needs about 200mA. Plugging more than 2 counters
into a hub will mean that the hub may need to be powered
externally. Please refer to the hub’s documentation for more details
about the power available per port.
2.3.2.2 Software For Non-Stacked Configurations
By default when you run USBcount50, it will automatically detect
all the counters connected via USB and will also check to see if the
counters are electrically connected together via the stack. To run in
Non-Stacked MIS mode, the software must be “told” to drive one
particular counter. You can then simply run multiple copies of the
USBcount50 software, one copy for each particular counter.
In order to achieve this mode of operation, USBcount50 accepts a
command line parameter
“USBcount50 /MISp:c”
4 They can of course still be snapped together, but remember NOT to fit any of the stacking connectors
so that the counters remain electrically independent of each other.
Elan Digital Systems Ltd. 14 USBcount50 USER’S GUIDE Iss1