Echelon LonWorks Router - Manual (Page 52)

Table 11. Service LED Behavior during Different States
Device State State Code Service LED
Applicationless and
Unconfigured
3 On
Unconfigured (but with
an Application)
2 Flashing
Configured, Hard Offline 6 Off
Configured 4 Off
Defective External
Memory
— On
The SVC~ pin is active low, and the service pin message is sent once per SVC~
pin transition. The service pin message goes into the next available non-priority
output network buffer.
Typical applications do not require debounce conditioning of a momentary
pushbutton attached to the SVC~ 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.
If your router uses a Series 3100 half-router for one of its sides, you can connect
the Series 5000 router’s SVC~ pin to the Series 3100 SERVICE~ pin, as shown
in Figure 19, using the Series 3100 Smart Transceiver’s +5 V power supply for
the Service switch, LEDs and diode clamps.
See the Series 5000 Chip Data Book for more information about the SVC~ pin for
a Series 5000 chip, including the Router 5000 and FT Router 5000.
42 LONWORKS Router Electrical Interfaces