Omega OM-USB-1208HS Series, Руководство пользователя

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OM-USB-1208HS Series User's Guide Functional Details
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Figure 6. W34 jumper location (default pull-down setting shown)
Figure 7. W34 jumper
– pull-down and pull-up configurations
6. Replace the top section of the case, and fasten it to the bottom section with the four screws. Replace the
rubber feet onto each screw.
For more information on digital signal connections
For more information on digital signal connections and digital I/O techniques, refer to the OMB-DAQ-2400,
OM-USB, OM-WEB, and OM-WLS Series General Guide to Signal Connections (available on our web site at
www.omega.com/manuals/manualpdf/M4830.pdf ).
Counter I/O
The terminals provide connections to each 32-bit counter input channel ( CTR0 and CTR1) . Each counter can
count frequencies of up to 20 MHz. Refer to Figure 3 on page 11 for the location of these pins
Timer output
Use the TMR terminal to connect to the pulse width modulation (PWM) timer output.
You can set the following timer output parameters through software:

pulse frequency

duty cycle (pulse width divided by the pulse period)

number of pulses to generate

time delay before starting the timer output after it's enabled

resting state of the output ( idle high or idle low )
The timer can generate a pulse output with a programmable frequency range of 0.00931 Hz up to 20 MHz.
Both the period and time delay ranges are 50 ns to 107.4 seconds. Figure 8 shows the timer output schematic.