User's Manual

Page 3–32
18 September 2007
SYSTEM DESCRIPTION, INSTALLATION, AND MAINTENANCE MANUAL
eNfusion™ HSD-128 High-speed Data Terminal
(e) Remote Status Panel – Combined/Selective (Optional)
An optional “remote status panel” may be installed in installations where the HSD
units are located in inaccessible or remote locations. The installation of a “remote
status panel” is recommended as it provides visual indications of each of the
power, fault, and call status of each of the units.
A “remote reset switch” for HSD transceivers can also be installed and located
with the Remote Status Panel.
Figure 3–10 illustrates a typical wiring diagram
for the remote reset circuit.
1. HSD Remote Reset Switch Circuit Requirements
Note: Combined Mode installations DO NOT support the use of the reset
function. In Selective Mode installations, the use of the reset function
is optional.
HSD transceivers support the installation of a Remote Reset Switch circuit
as shown in
Figure 3–9.
The HSD Remote Reset circuit requires less than 100 ohms between TP1K
(RESET) and MP1F(COM) to be asserted and greater than 10 kilohms to be
de-asserted (include all cable and switch contact resistance).
2. HSD Remote LED Driver Circuit Requirements
The circuit requirements for the HSD Remote Status LED drivers are shown
in
Figure 3–10. Each LED driver circuit has a 200-ohm current limit resistor.
The maximum cable resistance (including the forward and return paths) must
not exceed 100 ohms to provide adequate current to the 5 volt LEDs (i.e. 10
mA minimum) at the remote status panel.
It is recommended that the installer use shielded cables to provide a level of
noise immunity.
Figure 3–9. HSD Remote Reset Circuit – Combined/Selective