Johnson Controls METASYS VAV110 Technical Manual page 83

Zone Bus
1 1 2 F 1 1 3 F 1 1 4 F
Troubleshooting
-- HVAC PRO
for Windows
Table 36: Communication Errors on Download
Error Number
or Description
1
5
11
14
15
16
Hardware
Communication
Error
17
18
Table 36 lists and describes the errors that may occur while using the
HVAC PRO for Windows commissioning tool with the VAVs over the
Zone Bus. The cause of the error is often a loose or improper connection
between the CBLPRO (AS-CBLPRO), laptop PC, and the controller. A
defective COM port on the laptop could also be at fault. Other times, a
defective controller can cause an error.
Note: It takes ten seconds for a VAV Controller to reset and resume
communication after being downloaded.
An effective troubleshooting technique is to use a CBLCON and observe
its LEDs, which will indicate the problem. You may also try exchanging
the component that you believe is defective with a working component of
the same type.
A noisy wire adjacent to the Zone Bus can also cause communication
errors. Noise can be periodically induced into the Zone Bus, thereby
causing sporadic communication failures between the laptop and the VAV.
Most often, noisy lines cause intermittent disruption, not total loss of
communication.
For more information on the HVAC PRO for Windows, refer to the
HVAC PRO for Windows User's Manual (FAN 637.5).
Cause
Undefined The device is being sent a message
command that contains an invalid command.
Invalid The size of the message sent does
message size not correspond to the type of
message sent.
Invalid The command issued is not valid for
command the data type.
Not ready The VAV cannot process this
message at this time. For example,
the EEPROM is not functioning
properly.
2
Bad E Write A problem with the EEPROM exists.
No Some hardware problem exists,
communication such as a loose connection or a
failed component.
Controller is still in reset mode.
Resetting takes ten seconds after a
download.
Bad CRC The Cyclical Redundancy Check of
the message received is incorrect
due to an error in transmission.
Invalid The message received is not what
response the HVAC PRO for Windows Load
Utility expected.
Description
VAV Controller—Variable Air Volume (VAV) Controller 83
Solution
Check for tight and proper
connections between the laptop
PC, CBLPRO, and the VAV.
Cycle power on the VAV. If
problem persists, return VAV for
repair or replacement.
Return the VAV for repair or
replacement.
Check for tight and proper
connections between the laptop
PC, CBLPRO, and the VAV.
Wait ten seconds for the reset
period to expire before trying to
commission the controller.
Check for tight and proper
connections between the laptop
PC, CBLPRO, and the VAV.