Echelon DM-21 Device Manager - Manual (Page 32)

3-12 Network Cabling and Base Plate Installation
Table 3.4 - Type 1 Base Plate Terminal Block Color Coding
Terminal Number Terminal Color Function
1 - 4 Orange Network
5 Orange Cable shield, if used
6 - 9 Black Power
10 – 18 Green 4-bit subsystem
selection input
Two sets of screw terminals are provided for both the power and network wiring
connections. These connections are internally jumpered on the Type 1 Base Plate
PCB to provide continuity of the network and power wiring, even if no DM-21 is
installed, as shown in figure 3.11. This feature permits the base plate wiring to be
pre-installed and the network and power circuits checked for continuity
throughout the installation, before a single DM-21 is ever installed. This feature
also prevents network and power interruptions as a result of hot-swapping
modules during commissioning or service operations. Finally, providing two sets
of screw terminals permits incoming and outgoing wiring to be landed at separate
screw terminals without the need to insert more than one wire in any given screw
terminal.
1 2 3 4 5 6 7 8 9
Network 16-30VAC or VDC
Figure 3.11 - Base Plate Power and Network Wiring Connections
The DM-21 uses pins 10 - 13 on a Type 1 Base Plate to supply a subsystem
selection number. This is a binary number where Pin 10 represents the low-order
bit. See Chapter 4 for more information about the DM-21 pinout.
Type 1D DIN Base Plate Installation
Figure 3.12 presents a detailed view of the front side of the base plate. The
circuit board inside the Type 1D DIN Base Plate includes an arrow with the
designation "1A," designating it as a Type 1 Base Plate with a Revision A circuit
board. The 1D Base Plate is intended to be installed either on a 35mm DIN rail,
or using the integral keyhole slots, on a wall or panel. Two arrows indicates the
vertical orientation of the Base Plate that will provide the best viewing of the
front panel legends.