Emerson MONITORING OpenComms Manuel d'utilisateur télécharger pdf (Page 39)

External Enclosures

8.0 EXTERNAL ENCLOSURES

8.1 Power Connection

Power for the OpenComms Network card should be sourced from the

supplied wall-plug transformer. Use field-supplied wiring to connect

the outer terminals on the transformer to the screw connectors at TB3

on the Network Interface card. A field-supplied ground wire attaches

to the center terminal on the transformer and connects to the ground-

ing stud in the lower corner of the enclosure.

Figure 9 NIC-ENCL1 internal view

8.2 Communication Connection

Communications to the OpenComm Network Card is generally estab-

lished by using the unit’s SiteScan interface port. The specifics on

location and wiring details can be found in the respective unit’s user

manual.

The unit’s communications port is EIA-422, which measures ~3-5VDC

between the positive and negative terminals. The connection is polar-

ity sensitive, so use a voltmeter to verify polarity. The connection is

positive-to-positive and, negative-tonegative-. The result when the

card and the unit are connected together, a voltmeter will measure ~

3-5 VDC. Once proper communication has been established, voltage

readings will fluctuate.

To SiteScan

connection

terminals on unit

Field-supplied

use 18AWG

Refer to specific unit installation

communication connection

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Emerson MONITORING OpenComms Manuel d'utilisateur Page 39