Measurement Computing BTH-1208LS - Manual (Page 18)

BTH-1208LS User's Guide Functional Details
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Figure 6. Digital I/O external resistor configuration
Trigger input
The TRIG pin is an external digital trigger input that you can configure for either rising/falling edge, or high/low
level.
Counter input
The CTR pin is a 32-bit event counter that can accept frequency inputs up to 1 MHz. The internal counter
increments when the TTL levels transition from low to high.
Ground
The analog ground ( AGND ) pin provide a common ground for all analog channels. The digital ground ( GND )
pins provide a common ground for the digital, trigger, counter, and power terminals.
Power output
The + VO pin is a 3.3 volt output that can source up to 50 mA that is supplied by the power source of the device.
You can use this terminal to power external devices or circuitry.
Caution! The
+V0 pin is an output. Do not connect to an external power supply or you may damage the
BTH-1208LS and possibly the computer.
For more information about signals
For more information about analog and digital signals, refer to the Guide to DAQ Signal Connections at
www.mccdaq.com/pdfs/DAQ-Signal-Connections.pdf .