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PRODUCT INSTALLATION MANUAL
T
ROUBLESHOOTING
4.
4.1.
G
ENERAL
Due to the modular nature of the HIS system, a communication failure may occur anywhere in the data
transfer link from the software to the field device. In order to identify where the loss of communication has
occurred, it is important to understand which components are working correctly. Often, some simple checks
will save hours of troubleshooting. Some of the most common mistakes are: improper wiring connections,
baud rate mismatches, improper network settings, and improper addressing of the MUX 2700.
4.2.
MUX 2700
The LEDs on the front of the MUX 2700 provide a convenient indication to the user that the MUX 2700 is
operational. After the MUX 2700 self-test, the <Pwr On> light should be on, the <Fault> light should be off
and the <HART Tx> light may either be off or flashing steadily.
When power to the MUX 2700 is cycled all the lights will come on. Next the green <Pwr On> LED will flash
for approximately 15 seconds while the MUX undergoes a self-test. After the successful completion of the
self-test the LED will go solid on. For the next 60 to 120 seconds, the <HART Tx> light will flash three times
for each channel. During this time, the MUX 2700 is scanning each of the 32 channels. When it is finished,
the <HART Tx> LED will either flash steadily or turn off altogether. If you see all of the above occur, the
MUX 2700 is operating properly.
Note : The MUX 2700A will behave the same except the power LED will not flash during its
self-test.
In addition, the TEST setting on the option switches can be used to gain confidence that the module is
functioning. Follow the procedure below to use this feature:
1. With the power off, set the end switch to the TEST position (ON). The module should not be
connected to the RS-485 network, the RS-485 address switches have no effect. If an RS-485
terminal is connected to the module, the BAUD rate switches should be set.
2. Turn the power on. The LEDs should light for about 1 second each in sequence (RED, YELLOW,
GREEN...).
3. If the LEDs do not flash, there is a fault with the module and it should be returned for replacement.
4. To return to normal operation, remove power to the MUX 2700 and set the TEST switch to the OFF
position. Ensure that the correct BAUD rate is selected and that an RS-485 address is set. Then,
re-apply power.
DOCT-B3K4
P
AGE
16
18
OF
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