Echelon Series 6000 Chip databook - Manual (Page 71)

inputs for the connection to the Neuron 6000 Processor. A typical circuit configuration,
shown in Figure 22, can support up to 32 loads.
Individual device power sources can create problems when the common voltage exceeds –7 V,
+ 12 V, or with ground faults.
CP0
CP1
CP3
CP2
CP4
R
RE~
DE
D
A
B
VDD
GND
32 RX
34 TX
38
37 TXEN
39
Neuron 6000 Processor EIA-485 Transceiver
3.3 V Single-Ended Mode
+5 V
VDD3V3
+3.3 V
8
0.1 µF
10k
12V
12V
MUR115
(x4)
A
B
10k
+3.3 V
Figure 22. EIA-485 Twisted-Pair Interface (Uses Single-Ended Mode)
The EIA-485 specification requires a common ground reference for all transceivers. This
common ground reference can be provided by adding a third conductor in the network cable
or a separate connection to common ground at each device.
LPT-11 Link Power Transceivers
The Echelon L ON W ORKS LPT-11 Link Power Twisted Pair Transceiver provides a simple,
cost effective method for adding a network-powered L ON W ORKS transceiver to any Neuron
Chip-based sensor, activator, display, lighting device, or general purpose I/O controller. The
LPT-11 transceiver eliminates the need to use a local power supply for each device, because
device power is supplied by a central power supply over the same twisted wire pair that
handles network communications.
Figure 23 shows the basic configuration for connecting a Neuron 6000 Processor to an LPT-
11 Twisted-Pair Link Power Transceiver.
Series 6000 Chip Data Book 59