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Connectivity Module Troubleshooting A-3
Troubleshooting the Connectivity Module Listed below are possible problems, their causes, possible solutions
Problem Cause Solution
DIAG red light blinks rapidly then stays
on when the CM is first powered up.
Duplicate IP address. The IP address of one or more CMs
on the same network is set as same.
Unplug the Ethernet cable from all CMs.
Follow the instructions from the
appropriate configuration section to
change to a proper IP address. Reconnect
this CM to the network. The red DIAG light
should blink then go off. Repeat this
procedure for all other CMs one by one.
DIAG red light blinks slowly or stays on
after the CM is properly configured.
Major software or communication failure.
Press Reset button on CM. If condition still
exists, call your local ASI representative.
Message: Page not found. Wrong or improper IP address and subnet. Problem with
connections between CM, ATS Controller, PM, and/or
DPM. Wrong configuration.
Try to refresh the page again. If you get
the same results, verify the IP address and
wiring by pinging the device.
Message: No controller or power
manager has been found.
Problem with connections between CM Module, ATS
Controller, PM, and/or DPM.
Check wiring then press Reset button on
CM.
Message: 72E baud rate and at least
another device baud rate are
mismatched (or similar message).
Baud rates of CM, ATS Controller, PM, and/or DPM are
different.
If 7000 or 4000 Series ATS, set baud rate
of all the devices to 19200.
If Series 300 or ASCO 940/962, set baud
rate of all the devices to 9600.
Message: Communication error stays
on. (RX light is blinking & TX light is
off).
Lost connections. Check connections
Message: Communication error
comes on then goes off by itself.
Busy network or lost connections Increase reply time out.
LINK light is off
Invalid network Check if it is a proper IP address.
Check the Ethernet cable and
connections.
4-wire / 2-wire Modbus
communication problem
- ATS or PM are not configured for Modbus protocol
- ATS or PM are not configured with the same baud rate
as the CM
- ATS or PM are configured with the same serial address
- For 4-wire communication, ATS was not configured for
4-wire mode
- For 2-wire communication, ATS was not configured for
2-wire mode
- For 2-wire communication, CM 2-wire DIP switch was not
enabled
- For 2-wire communication, 2-wire mode was not enabled
at the CM configuration page
- Modbus master is not requesting the correct set of
holding registers
- Modbus master requesting more holding registers than
the CM can handle
- Modbus master reply timeout may be too short
- Modbus master using incorrect CM IP address or TCP
port
- Make sure ATS and PM are configured
with: Modbus protocol
the same baud rate as CM
the correct serial I/F setting
(4-wire/2-wire)
unique serial addresss
- For 2-wire communication, make sure
to configure the CM serial I/F setting for
2-wire mode at the configuration page;
and to enable its 2-wire DIP switch
- Modbus master should refer to doc.
381339-221 for the ATS and PM
holding registers.
- Modbus master must use appropriate
relay timeout (usually starting with 1000
ms) and to consider using retries (3
recommended) before calling for
communication error.
- Modbus master must request a
maximum of 12 holding registers from
the ATS controller & 24 from the PM
- Modbus master connect to the same IP
address and TCP port assigned to CM
- Check serial wiring connection between
ATS/PM and the CM
Intermittent loss of
communication / connection
CM disconnects the client because client was inactive / idle
(stops sending requests longer than 10 seconds)
When client connects to the CM, it should
never stop communicating (sending
request) at all times. When CM detects
inactivity from the connected client (from
its last request) longer than 10 seconds,
the CM will automatically disconnect it.
That client must then reconnect to resume
communication.
AES enable client getting incorrect
response or no response from the CM.
Incorrect CM configuration settings:
- AES is not enabled
- Incorrect AES port
Provide correct CM AES configuration
settings
ATS = automatic transfer switch, CM = Connectivity Module, DPM = Digital Power Meter, PM = Power Manager