Appendix
120 AFP-2800/2802 Manual – P/N 11249 11-Mar-08
8.7.5.3 NCM SWITCH FUNCTIONS: GROUND FAULT DETECTION AND LINE
TERMINATION
The NCM-W provides two sets of switches to simplify network set-up. Default settings for AFP-2800 networks are
shown in the diagram below.
EF B TERM B EF A TERM A
SW 100SW 101 SW 102 SW 103
ON
OFFOFF
ON
SW IT CH
DET AIL
To enable ground fault detection, set SW103 for Channel A; SW101 for Channel B, to the ON position
To activate the on-board end-of-line resistors, set SW100 for Channel A; SW102 for Channel B, to the ON
position. There MUST be a functioning terminating resistor on the first and last node/repeater of a wire
segment (between 2 nodes). This means that in a ring configuration each NCM in the ring MUST have
terminating resistors enabled for both channels.
8.7.5.4 NCM DIAGNOSTIC LED INDICATORS:
The NCM has LEDs that serve as diagnostic indicators to help in troubleshooting and system connection. The
table below outlines their function.
A HI
RCD A
STAT A
RECO N
RESET
LED detail
B HI
RCD B
PULSE 1
STAT B
POW ER
LED Indicator LED Colour LED Description
A HI Green Illuminates to indicate that the NCM-W Port A is set for high threshold
B HI Green Illuminates to indicate that the NCM-W Port B is set for high threshold
RCD A Green Illuminates when the NCM is receiving data from the network on Port A
RCD B Green Illuminates when the NCM is receiving data from the network on Port B
STAT A Yellow Illuminates when the NCM has not received valid data on Port A for at least
16 seconds
STAT B Yellow Illuminates when the NCM has not received valid data on Port B for at least
16 seconds
RECON Yellow Illuminates when a reconfiguration on the network is in progress
PULSE1 Green Illuminates when the NCM is transmitting data to the network
RESET Yellow Illuminates when the microcontroller fails
POWER Green Illuminates when +5VDC is available
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