Signal definitions, Continued, 3 usm2 signal definition – Alpha Technologies USM2 User Manual

Page 25

™

704-587-B0-003 Rev.D

4.3 USM2 Signal Definition,

continued

Name:

Common

Pin:

J3-12

Signal Type:

Ground reference / return

Referenced to:

N/A

Description:

Ground / return reference for ALL signals (analog, input & output) on the
USM. Same as pins 1 and 15.

Name:

Output Current #2

Pin:

J3-13

Signal Type:

USM2 Analog Output #2

Referenced to:

Common (J3-1, J3-12)

Description:

This USM2 analog output is a DC approximation of the total XM2 AC output #2
current.

Parameters:

0.4VDC per AC ampere XM2 output.

How to Test:

Verify voltage on J3-13 is 0.4VDC per AC ampere XM2 output #2.

Name:

Tamper Switch In

Pin:

J5-1

Signal Type:

USM2 Discrete Input (dry contact switch)

Referenced to:

J5-2

Description:

Dry contact tamper switch input. Left open circuit, this USM2 input will be
pulled up to +5VDC

Active Means:

The enclosure’s door is open or the tamper switch is not connected.

Active State:

OPEN

Inactive Means:

The enclosure’s door is closed.

Inactive State:

SHORT

How to test:

See ‘How to Test’ for J3-7 (page 23).

Name:

Tamper Switch Return

Pin:

J5-2

Signal Type:

Ground Reference / return

Referenced to:

N/A

Description:

Return / ground for Tamper switch.

NOTE:

ALL values are provided for troubleshooting and reference purposes ONLY. This document is not intended as
a product definition. All values and operations are subject to change. All Values used as examples are for
USM2-SEG, which is the factory default USM2 configuration.

4. Signal Definitions