Emerson Rosemount 3490 Series, Reference Manual

Page: 33 / 190

3.4.9 Digital control voltage-free contact inputs
There are two trigger inputs: IN1 and IN2. Each input is connected as shown in Figure 3-12 .
Figure 3-12: External Trigger Input Connections
IN
A
0V
B
10 11
12
A. External contact closure
B. 10 or 11
3.4.10 RS232 connections
The RS232 connections, terminals 4, 5 and 6, are for downloading logged data to a PC or a
hand-held device.
• The wall-mountable Rosemount 3493 Control Unit is factory pre-fitted with a RS232
data-download socket, which is also pre-wired to terminals 4, 5, and 6.
• The panel-mountable Rosemount 3493 Control Unit is supplied with a data-download
socket ready to be fitted to a panel, which then needs to be wired to terminals 4, 5, and
6 on the rear of the control unit.
When there is data to be downloaded using Rosemount LogView or other software,
connect the RS232 data-download cable supplied with the socket.
Fitting the RS232 data-download socket to a panel
The panel-mountable Rosemount 3493 Control Unit is supplied with a data-download
socket ready to be fitted to a panel, which then needs to be wired to terminals 4, 5, and 6
on the rear of the control unit.
Procedure
1. Cut-out the hole in the panel.
Figure 3-13: Panel Cut-out (RS232 Data Download Socket)
0.47(11.85)
0.13 (3.2)
Ø0.81 (Ø20.5)
Dimensions are in inches (millimeters).
Reference Manual Installation
00809-0100-4841 January 2021
Emerson.com/Rosemount 33