Revision 4.02 June. 2000 17
INTERMITTENT LAN PROBLEMS
B1. WHICH MODULES ARE INTERMITTENT ?
Using an LCD Terminal or Review Logging via Upload/
Download software, check Review Data for “Module Lost”
and “Module Found” messages.
Each message will also identify the Module type and
number. Note the problem module/s.
Proceed to Step B2.
⇓
B2. IS ANOTHER EVENT CAUSING THE MODULE
TO BE LOST ?
Look at the Review Messages immediately preceding the
“Module Lost” messages for any event that repeatedly
coincides with the loss of module/s, or if the loss of
module/s occurs at, or around, the same time of day.
Look for messages such as Door Un-lock/Lock, Siren On,
Auxiliary On, etc., and note the times when the “Module
Lost” messages occured.
YES. Ancillary devices & external equipment (e.g.
electrical machinery) can produce voltage spikes, electrical
noise and excessive current drain.
If the LAN, Power & Auxiliary circuits are not wired
correctly or Earth loops exist, these devices can interfere
with LAN communications.
If such an event does coincide with loss of comms,
reproduce the sequence of events to confirm the effect, then
check any associated wiring circuits accordingly.
NO. Proceed to Step A8
LAN DEAD
⇒ C1. TEST VOLTAGES AT CONTROL MODULE
Perform LAN Voltage Checks at the Control Module.
Refer to the table “LAN Voltage Testing” on Page 16.
If this fails to locate the problem, proceed to Step C2.
⇓
C2. ISOLATE PROBLEM CABLING OR MODULE/S
Disconnect all LAN wiring from Control Module.
Reconnect one LCD Terminal and ensure that it
communicates. (If it doesn’t, follow Steps A7 & A8)
Reconnect the LAN one module at a time until a problem
module, or section of cabling kills LAN communications
when reconnected.
With the problem area identified, proceed to Step A8.
⇓
1. LAN TERMINATION CHECK
Very early 3000 products (Australia & NZ only) had 120
Ohm Termination resistors which results in lower
measurements (~70 to 140 Ohms). When expanding these
systems, take termination OUT on the existing modules,
and put termination IN on two of the new modules.
Alternatively, take termination OUT on the existing
modules and fit a 470 Ohm resistor between LAN A & B
on those two modules instead. NOTE: This is only
necessary if expanding the system, or if there are
communication problems. If the system is operating
reliably, no modification is necessary.
2. TERMINATION RESISTOR CHECK
To determine if a module is fitted with a 120 Ohm or 470
Ohm Termination Resistor, ensure that TERM is “IN”,
disconnect the module from the LAN, remove power, and
measure across LAN A and B on the module with the
meter on the OHMS range.
3. MODULE POWER TEST
The Test Menu can be used to check LAN Power
conditions. Logon to the LCD Terminal, then press
<MENU>, 4, 8. This activates the power test, and the
results will be displayed on the LCD Terminal, and in the
review memory. See “Concept 3000 Programmer’s
manual” Rev 2.3 p154 for more information.
NOTES:
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