Echelon LonWorks Router Manual de usuario descargar pdf (Pagina 50)

Series 5000 Router

(Router 5000 or FT Router

5000)

A Side

RST~

+ 5 V + 5 V

100 pF

+ 5 V

To other

devices

Series 3100 Router

B Side

RESET~

Reset

Figure 17. Reset Circuit – Series 5000 Router with Series 3100 Router

Typical applications do not require debounce conditioning of a momentary

pushbutton attached to the RST~ 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

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

motherboard as described in Low Voltage Protection.

See the Series 5000 Chip Data Book for more information about the RST~ pin for

a Series 5000 chip, including the Router 5000 and FT Router 5000.

SVC~

The SVC~ pin alternates between input and open-drain output at a 76 Hz rate

with a 50% duty cycle. When it is an output, it can sink up to 8 mA for use in

driving an LED. When it is used exclusively as an input, it uses an optional

external pull-up to bring the input to an inactive-high state.

Under control of the Neuron firmware, this pin is used during configuration,

installation, and maintenance of the Series 5000 router device. The firmware

flashes the LED at a 1/2 Hz rate when the Series 5000 router chip has not been

configured with network address information. Grounding the SVC~ pin causes

the Series 5000 router to transmit a network management message containing

40 LONWORKS Router Electrical Interfaces

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Echelon LonWorks Router Manual de usuario Pagina 50