Chapter 5 Installing the Tracer MP581 programmable controller
Wiring LonTalk to the Tracer MP581
IMPORTANT
When installing the Tracer MP581 controller in areas of high electro- magnetic interference (EMI) and radio frequency interference (RFI), fol- low the additional installation instructions in “EMI/RFI considerations” on page 62.
Note:
Although LonTalk links are not polarity sensitive, we recom- mend that you keep polarity consistent throughout the site.
To wire the LonTalk link:
1.At the first Tracer MP581 on the link, complete the following steps:
•Connect the white wire to the first (or third) LonTalk screw termi- nal as shown in Figure 37.
•Connect the black wire to the second (or fourth) LonTalk screw terminal.
•If this is the first LonTalk controller on the daisy chain, place a 105 Ω termination resistor across the LonTalk screw terminals.
Figure 37. Wiring the first device to the LonTalk connection on the termination board
Note: Place a 105 Ω termination resistor at the first and last LonTalk device on the daisy chain. Termination resistors require insulation, such as heat shrink tubing, to avoid accidental shorts to other conductors.
2.At the next Tracer MP581 (or other LonTalk controller) on the link:
•Connect the white wires to the first and third LonTalk screw ter- minals (as shown in Figure 38 on page 75).
•Connect the black wires to the second and fourth LonTalk screw terminals.
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