109
M0CZ00007-03
ERROR: RS485 NETWORK
TROUBLESHOOTING
1. All the units requested do not
respond.
- Verify no short-circuits occurred on the
RS485 serial line
- Ensure that the power supply is
available.
2. Some units requested do not
respond.
- Ensure they are switched on
- Ensure that the address, baud-rate and
parity are correct
- Ensure that they are connected to the
bus correctly
- Referring to the electrical diagram, verify
if the TTL/485 converter on the fan coil
is connected correctly or it has been
introduced erroneously on the card
programming TTL
- Try to replace the converter installed
3. From a certain point on, the units do
not communicate
- It is likely that the bus of the first unit
does not communicate due to a short-
circuit
- It is likely that the unit that precedes
physically the first unit that does not
communicate have inverse bus polarity
- It is likely that the line section that
powers these units is interrupted
accidentally or is not connected.
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