Emerson Rosemount 3490 Series Reference Manual page 34

Installation
January 2021
2. Insert the socket into the hole.
3. Use the supplied mini-B nut to secure the socket to the panel.
4. Wire the socket flying lead to terminals 4, 5, and 6 (panel mount unit)
34
A. 4: Rx (white)
B. 5: Tx (red)
C. 6: 0V (black)
Reference Manual
00809-0100-4841
Emerson.com/Rosemount