Signal definitions, Continued, 3 usm2 signal definition – Alpha Technologies USM2 User Manual
Page 25
25
©2000
™
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