LCN System Installation 4-2 9/96
4.2
STEP 2
Five-Slot Modules Hiway Gateway modules that connect to Data Hiways that
do not have HTDs must have a ground wire installed from
the DHI I/O board to the MRG.
54065
Five-Slot
Module
CG
LG
5
4
3
2
1
HG
DHI I/O
Wire the screw on the DHI I/O
board to the HG ground terminal
in the cabinet.
Figure 4-2 — Logic Ground (LG) Connection to Safety Ground Stake
Dual Node Modules If an HG is used without an HTD, the DHI I/O board
ground screw must be connected to the HG connection
post (shown in the figures of this section) and the HG
connection post must be wired with 4-gauge wire to the
Master Reference Ground (MRG), as shown in the Data
Hiway Subsystem Site Planning manual.
If the HG, used without an HTD, is located in a cabinet,
the LG/HG service post must be grounded to an MRG Star
Plate with a 5.3 m
2
(#4 AWG) wire.
Daisy chaining of MRG and HG grounds is not allowed.
54067
LG
CG
Dual Node
with HG
LG HG
DHI I/O
MRG Star Plate
or MRG Stake
Figure 4-3 — DHI I/O Ground Connection in a Dual Node Module
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