MidNite Solar Communication Adapter User Manual Rev A
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Typical Wall Mounted Connections
TERMINATION JUMPERS
SMA’s ComSync cable conforms to the CAN bus specification, a very fast and reliable system developed
by Bosch for vehicle applications. Most CAN devices have an IN and an OUT connector and a provision
for terminating the bus, a 120 ohm resistor at each end of the bus. The bus connects a linear string of
CAN devices into a network. If a device is located in the middle of the bus, no termination is used. The
two end device require a terminator. The Sunny Island uses a terminator that looks like an RJ-45
connector without a cable. If the Sunny Island is the last device on one end of the bus, plug the
terminator into the RJ-45 receptacle on the Sunny Island that isn’t connected to another CAN device.
The vast majority of applications the Communication Adapter will be the last device on the ComSync bus
so the CANBUS OUT jack will be unused. For this reason the Communication Adapter’s bus termination
resistor is internal. If the system design requires CAN devices to be connected to both connectors, you
must remove the cover from the unit and place the termination jumper, CON 7, on one of the pins only.
Place CON 7
terminaton
jumper on
ONE of the
pins if used
in the
middle of
the bus.
