TD 91684GB
16 April 2015 / Ver. G
Installation Guide
T942C and T942C/2 Central Unit
24
2.4.7 FLASH PROMs Containing Software for the Main and Communication Processors
1 Press the FLASH PROMs containing the software for the main processor,
onto IC-
socket IC13.
2 Press the FLASH PROM containing the S942C software for the communication
p
rocessor, onto IC-socket IC54.
2.5 Installation Test Procedure
S942C software
Energize all the units in the system. Function indicator LED01 on T9
42C/2 should light red
for about 1 second and then change to a flashing orange light.
Figure 30. Central Unit T942C/2
At a start-up the Central Unit begins with a short sel
f test for a few seconds. The function
indicator indicates this by short blinks at one second intervals. The parameter list in the
FLASH PROM is copied to the memory.
If no faults are detected, the Central Unit then makes a surve
y of the modules connected to
the data buses. The function indicator blinks rapidly (orange - 5 times/second) until all data
buses are surveyed. After this the function indicator lights steadily.
If it continues to indicate with a stead
y red, check that supply voltage is 12.5 V DC ± 10%.
Flashing indicates a fau
lt as follows:
Colour ON OFF Fault
red 100 ms 800 ms Incorrect software licence*
green 800 ms 100 ms Parameter fault
red 1 s 1 s Watchdog reset
*All T942C/2 software is licenced and must be ordered.
2.6 Circuit Board Replacement
Refer to T942C, see 1.6 Circuit Board Replacement on page 19.
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