Measurement Computing USB-TC-AI - Manual (Page 14)

USB-TC-AI User's Guide Functional Details
14
External components
The USB-TC-AI has the following external components, as shown in Figure 5.
1 Screw terminal pins 1 to 26 3 LEDs: Activity (top) and Power (bottom)
2 Screw terminal pins 27 to 52 4 USB connector
Figure 5.External component locations
Screw terminals
The screw terminals provide connections for thermocouples, voltage input, digital I/O, ground and power
output. Refer to the "Signal I/O ConnectionsError! Reference source not found." chapter beginning on page
10 for screw terminal descriptions.
USB connector
The USB connector provides +5V power and communication. No external power supply is required.
LEDs
USB-TC-AI has two LEDs – Activity and Power .
 The
Activity LED (top) blinks when data is transferred.
 The
Power LED (bottom) turns on when the device is receiving power from the USB cable .
Power
The two +5V terminals are isolated (500 VDC) from the USB +5V.
Caution! Each +5V terminal is an output. Do not connect to an external power supply or you may damage
the USB-TC-AI and possibly the computer.