Usb Connector; Led; Screw Terminal Wiring - Measurement Computing USB-1208FS User Manual

USB-1208FS User's Guide

USB connector

The USB connector is on the right side of the USB-1208FS. This connector provides +5 V power and
communication. The voltage supplied through the USB connector is system-dependent, and may be less than
5 V. No external power supply is required.

LED

The LED on the front of the housing indicates the communication status of the USB-1208FS. It uses up to 5 mA
of current and cannot be disabled. The table below defines the function of the USB-1208FS LED.
LED Illumination
Steady green
Blinks continuously

Screw terminal wiring

The USB-1208FS has two rows of screw terminals—one row on the top edge of the housing, and one row on
the bottom edge. Each row has 20 connections. Pin numbers are identified in Figure 4.
Screw terminal – pins 1-20
The screw terminals on the top edge of the USB-1208FS (pins 1 to 20) provide the following connections:

Eight analog input connections (

Two analog output connections (

One external trigger source (

One SYNC terminal for external clocking and multi-unit synchronization (

One calibration terminal (

Five analog ground connections (

One ground connection (

One external event counter connection (
LED Illumination
Indication
The USB-1208FS is connected to a computer or external USB hub.
Data is being transferred.
Figure 4. USB-1208FS Screw terminal pin numbers
to
CH0 IN CH7 IN
to
D/A OUT 0 D/A OUT 1
TRIG_IN )
)
CAL
)
AGND
GND )
)
CTR
14
)
)
SYNC
Functional Details
)