Chapter 7: Service and troubleshooting
EST3X Technical Reference Manual 175
When multiple SFS1-CPU modules are networked together, using Class B wiring
the network data LEDs should flash on all panels except the first and last panels.
This indicates normal two-way network communication activity on both data
channels.
When multiple SFS1-CPU modules are networked together using Class A wiring,
the network data LEDs should flash continuously. This indicates normal two way
network communication activity on data channels A and B.
The data network and digital audio risers are isolated at each SFS1-CPU. This
prevents a shorted data loop from interrupting communication on the entire loop.
When trying to isolate trouble on a data network or digital audio riser, remember
that both shorted and open loop segments will interrupt communication between
two SFS1-CPU modules. In this case, the EST3X life safety network will
reconfigure and operate as two independent sub-networks
Due to the isolation between cabinets, during a ground fault condition the number
of potential loops to be investigated is limited to those originating from a single
cabinet.
Table 41: SFS1-CPU Main Board troubleshooting
Possible cause
s DS9 (RX) and DS10
(TX) or DS11 (RX) and DS12
(TX)
are off, or both pairs are
• The TB5 network wiring + and − are reversed
• The loop was not properly terminated
• The network A and B loops are crossed
• An improper wire was used
• A ground fault has been detected
• The 3X-NET8/3X-NET option card is not properly seated
eripheral RS-232 device
is inoperative
• The TX and RX wires are reversed
• The CPU and peripheral device baud rates are mismatched
• The peripheral device is off-line or improperly configured
• The communication card is missing
• There is lack of continuity on the network wiring
-485 (TB5) network
is inoperative
• Network wiring + and − are reversed
• The 3X-NET8/3X-NET option card is not seated properly
• The network A and B loops are crossed
• An improper wire was used
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