MidNite Solar Communication Adapter User Manual Rev A
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CLASSIC ADDRESSING and CONNECTIONS
The Classics communicate with the Communication Adapter without confusion by having unique
addresses for each Classic. The addresses need to be set by the installer when commissioning the
system. The Classics are set to MODBUS addresses #10, #11, #12, and #13 (See Overview Diagram).
Note what each Classic’s address is when making connections. If only one Classic is used with the Sunny
Island, the controller’s address must be #10, which is default, so there is no need to change it.
If two Classics are installed, the second Classic’s address will be #11. Connect a communication cable
from the MASTER/IN jack on the first Classic (#10) to the SLAVE/OUT jack on the second Classic. If three
Classics are installed, the third controller’s address will be #12. Connect a communication cable from the
MASTER/IN jack on the second Classic (#11) to the SLAVE/OUT jack on the third Classic. If a fourth
Classic will be installed, its address will be #13. Connect a communication cable from the MASTER/IN
jack on the third Classic (#12) to the SLAVE/OUT jack on the fourth Classic. There is no connection to the
MASTER/IN jack on the last Classic (typically #13).
Connect a CAT-5 Ethernet cable of suitable length from the SLAVE/OUT jack on the FIRST Classic (#10)
to the RJ-11 connector at the far right end of the Communication Adapter. Connect one end to Classic
#10. Do not plug in the end for the Communication Adapter quite yet. The other RJ-11 connector
(MODBUS OUT) is reserved for future use
.
Connect one end of the ComSync cable from the Sunny Island to the CANBUS IN connector on the
Communication Adapter. Connect the other end of the ComSync cable to the ComSyncIn connector on
the Sunny Island inverter (center of the three RJ-45 connectors at the bottom right). If there are no
other devices on the Com Sync (CAN) bus the terminator should be installed in the RJ-45 ComSyncOut
jack (directly above). If there are other CAN devices in the system the terminator should be installed on
the last CAN device. The Communications Adapter comes with the terminator jumper (CON7) factory
installed since the CANBUS OUT connector is generally not used.
MESSAGES
There are several signals passed between the Sunny Island and the Classics which are translated by the
Communication Adapter. The Communication Adapter periodically requests battery and PV status from
each classic. Once it has read all the Classic status values it converts the messages into ComSync format
and sends them on to the Sunny Island. Note that the times given are approximate and depend on how
many Classics there are in the system and how busy the system is
Battery Current
is requested from each Classic, converted to ComSync encoding and sent to the Sunny
Island approximately every five seconds.
PV Voltage
is requested from each Classic, converted to ComSync encoding and sent to the Sunny Island
approximately every five seconds.
Battery Voltage
is requested from each Classic, converted to ComSync encoding and sent to the Sunny
Island approximately every five seconds.
PV Power
is requested from each Classic, converted to ComSync encoding and sent to the Sunny Island
approximately every five seconds.
