Echelon DM-21 Device Manager - Manual (Page 16)

2-2 Description of the DM-21 Base Plates
The DM-21 Base Plate
The DM-21 module is installed in a LonPoint Type 1 Base Plate, revision 1A.
Wiring connections to the DM-21 module are presented in Chapter 4.
The rear of the PCB assembly includes a polarized, shrouded, 14-pin interface
connector that connects to a mating socket in a Type 1 Base Plate (for mounting
on to 4" square electrical boxes) or Type 1D DIN Base Plate (for mounting to a
35mm DIN rail or a wall).
Network, power, and I/O wiring are connected to screw terminals located on a
Type 1 Base Plate (figure 2.1) or Type 1D DIN Base Plate (figure 2.2), into which
the DM-21 module is plugged; no wiring is ever connected directly to an Interface
Module. A writing space is provided on the back of the Type 1 Base Plate for
recording the date of installation or other pertinent information. Installers
should take care to use a fine-point (smudge-free) pen. In Type 1/1D Base Plates,
the associated module is affixed to the Base Plate by means of two 8-32, 3/8”
screws (Echelon 205-0130-01) that are provided with each module.