Screw Terminal Banks - Measurement Computing USB-3100 Series User Manual

USB-3105 User's Guide

Screw terminal banks

The USB-3105 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 28 connections. Use 16 AWG to 30 AWG wire gauge when making screw terminal
connections. Pin numbers are identified in Figure 4.
Screw terminal – pins 1-28
The screw terminals on the bottom edge of the USB-3105 (pins 1 to 28) provide the following connections:

Eight analog voltage output connections (
VOUT14 )

Four analog ground connections (

Eight digital I/O connections (
Screw terminal – pins 29-56
The screw terminals on the top edge of the USB-3105 (pins 29 to 56) provide the following connections:

Eight analog voltage output connections (
VOUT15 )

Four analog ground connections (

One SYNC terminal for external clocking and multi-unit synchronization (

Three digital ground connections (

One external event counter connection (

One digital I/O pull-down resistor connection (

One voltage output power connection (
Pin 29
Pin 1
Figure 4. USB-3105 screw terminal pin numbering
VOUT0, VOUT2, VOUT4, VOUT6, VOUT8, VOUT10, VOUT12,
AGND )
to )
DIO0 DIO7
VOUT1, VOUT3, VOUT5, VOUT7, VOUT9, VOUT11, VOUT13,
AGND )
)
DGND
CTR )
DIO CTL
)
+5V
13
Pin 56
Pin 28
SYNCLD
)
Functional Details
)