Echelon LonWorks Router - Manual (Page 57)

RTR-10 Neuron Chips. In the sample circuit of Figure 27, protection is provided
by a Motorola MC33164.
See the Series 5000 Chip Data Book for information about internal low-voltage
indications for Series 5000 chips, including the Router 5000 and FT Router 5000.
L ON W ORKS Router User’s Guide 47