Measurement-computing USB-1208LS User Manual download pdf (Page 10)

USB-1208LS User's Guide Functional Details

USB connector

The USB connector is on the right side of the USB-1208LS housing. This connector provides +5V power and

communication. The voltage supplied through the USB connector is system-dependent, and may be less than

5V. No external power supply is required.

LED

The LED on the front of the housing indicates the communication status of the USB-1208LS. It uses up to

5 mA of current and cannot be disabled. The table below defines the function of the LED.

LED illumination

LED Illumination

Indication

Steady green

The USB-1208LS is connected to a computer or external USB hub.

Blinks continuously

Data is being transferred.

Blinks three times

Initial communication is established between the USB-1208LS and the computer.

Blinks at a slow rate

The analog input is configured for external trigger. The LED stops blinking and illuminates

steady green when the trigger is received.

Screw terminal wiring

The screw terminals provide the following connections:

 Eight analog inputs (CH0 IN to CH7 IN)

 Two analog outputs (D/A OUT 0 to D/A OUT 1)

 16 digital I/O connections (PortA0 to Port A7, and Port B0 to Port B7)

 External trigger input (TRIG_IN)

 External event counter input (CTR)

 Power output (PC+5 V)

 Calibration output (CAL)

 Ground connections (GND)

Use 16 AWG to 30 AWG wire when making connections to the screw terminals. The single-ended mode pinout

is shown in Figure 3.

Figure 3. Single-ended mode pinout

1 2 ... 5 6 7 8 9 10 11 12 13 14 15 ... 25 26

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Measurement-computing USB-1208LS User Manual Page 10