40 1200C-2000C Fire Alarm Control Panel, Repeater, and Black Box Installation Manual
LON network cable
The recommended cable is CAT5 with a characteristic impedance of 100 .
Maximum cable length between nodes is limited. End-of-line termination resistors
need to be used to match the cable characteristic impedance to prevent reflections.
The use of stub wiring is not recommended.
Maximum cable length (bus topology) 1.5 km
Maximum number of nodes (bus topology) 32
RS232 null modem cable
A 7-way null modem cable with full handshaking is used to connect the control panel
to a PC. The figure below shows the required DB9 control panel to PC (female to
female) cable configuration. The cable length should not exceed 12 m.
Figure 22: Null modem cable configuration
Output connections from addressable, supervised units
We recommend that shielded cable be used for all output connections from
addressable, supervised units. Cable characteristics are as follows:
Maximum output resistance 30
Maximum output capacitance 120 nF
Maximum recommended cable length 500 m
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