User manual

Troubleshooting

Problem:

Cannot connect to the controller via EIA-485

Solution:

Check the following:

• The RS-232 port is not in use. The EIA-485 and RS-232 ports cannot be used simultane-

ously. Only one port can be used at a time.

• The RSC-1 adapter used to connect the PC to the EIA-485 network shows a green LED

and pulses red when a connection is attempted. See the RSC-1 documentation for more

information.

• Each controller or device on the EIA-485 network has been programmed with a unique

MODBUS ID.

• A serial cross-over (Null Modem) cable is used for the connection between the PC and the

Morningstar RSC-1 485 Adapter. A straight-through serial cable will not work.

• Power is supplied to the 4-wire bus on the Power/Ground lines. The bus requires voltage

in the range: 8 - 16 Vdc.

• All bus connections are secure and each terminal is wired in parallel: line A to line A, line B

to line B, etc.

Problem:

Cannot connect to the controller via Ethernet

Solution:

see the TriStar MPPT Networking Companion Document, available on our website.