Ncm Idle Time - Johnson Controls 300 Series Manual

52 Network Control Module 300 Series Technical Bulletin

NCM Idle Time

5. If no errors occur, the LEDs remain off (except Power). If errors
occur, they are displayed. Refer to Appendix B: NCM Maintenance
in this document for more information. Failure of Test 1 or 2
causes that LED to flash until power is cycled; the remaining error
LEDs are displayed only momentarily. (If necessary, use the
LOGFILE Command on WNCSETUP to view the startup errors.)
6. After successfully completing the startup tests, all the LEDs light
for about 5 seconds for the NCM300 and NCM311, or about
22 seconds for the NCM350 and NCM361.
7. The NCM's node address (decimal) is then indicated as a binary
number using LEDs 1 through 8. Bit 0 corresponds to the least
significant digit (LED 1), Bit 7 to LED 8. The address remains lit
for 5 seconds. (Example: LED 1, 2, and 6 On indicates a node
address of 35.)
8. For an NCM350, the node address, network name, and IP address
are displayed on Port 4 if a VT100 emulator is connected at
9600 baud when the NCM350 starts up requiring a download.
9. If the NCM has been previously downloaded, with the battery
connected, it begins in its operational state. If no download has
been performed, the NCM requests a download. LED operation is
switched to hardware use for RECV/XMIT status of the serial
channels.
Idle Time Percent Calculation
The NCM calculates NCM idle time percent with the following
equation every 5 seconds:
Idle Time % = Last Idle Time % + (Change in Idle Time % * 0.04)
where Change in Idle Time = last idle time percent subtracted from the
present idle time percent
Even when there are large changes in idle time, there is a delay before
the Idle Time % reflects these changes. For example, if the last idle
time percent was 100 and the present idle time percent is 0 the
equation would be:
Idle Time % = 100 +[(0 – 100) * 0.04]
Idle Time % = 100 + (-100 * 0.04)
Idle Time % = 100 + -4
Idle Time % = 96
Almost 100 seconds after the idle time goes from 100 to 0 (and
stays 0), the Idle Time % reaches fifty percent.