Reset – Echelon LonWorks Router User Manual

Page 36

listing of the communications parameters for each transceiver type.

PKT

The PKT output can be used as a network activity indicator. When packets are

passed between the router sides, PKT is active. This signal uses the unbuffered

IO0 signal from the Neuron Chips. You can add a pulse stretcher circuit driven

by PKT to make an activity LED flash, as in the example circuit shown in

Figure 27 in chapter 4.

RESET~

The Neuron Chip reset pins are tied together and brought out on one pin.

Figure 10 shows the reset circuitry on the RTR-10 router.

RTR-10

A Side

RESET~

5 V

68 pF

5 V

To other

devices

RTR-10

B Side

RESET~

Reset

Note: RTR-10 Modules

are limited to 2 x 68 pF

external on the RESET~

line

Figure 10. RTR-10 Reset Circuit

Typical applications do not require debounce conditioning of a momentary

pushbutton attached to the RESET~ pin. The software response time associated

with this input is long enough to effectively provide a software debounce for

switches with a contact bounce settling time as long as 20 milliseconds. The

RESET~ signal must be driven low by a low voltage protection circuit on the

router motherboard as described in Low Voltage Protection.

LONWORKS Router Electrical Interfaces