MidNite Solar Communication Adapter User Manual Rev A
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COMMUNICATION STATUS LEDS
LED OPERATION
There are four green LEDs on the Communication Adapter, two below each RJ-45 jack numbered 1-4
from left to right. All four LEDs come on once briefly at power up.
LED 1
will blink on and off slowly (five second interval) when connected to a Classic (if power is applied).
This shows that the software is working. If the ComSync cable is connected and software receives the
Sunny Island’s “Battery Set Voltage” command, the blink rate of LED1 will increase to approximately
once per second. If the ComSync bus is working properly a noticeable difference in blink rate will be
observed when the cable is plugged in.
LED2
flashes briefly when a MODBUS request has been correctly received from a Classic. There typically
are four packets received per Classic in a burst with a slight pause before the next Classic is polled. If
there is only one Classic four quick blinks will be seen. If there are two Classics, typically two sets of four
quick blinks will be seen. If there are three or four Classics, there will be three or four sets.
LED3
flashes briefly when the “Battery Set Voltage” packet is sent out to the classics. If things are
working properly, typically several blinks in a burst will be seen repeated on about thirty second
intervals.
LED4
is a MODBUS error indicator. It briefly blinks once for each MODBUS CRC, timeout, or exception.
A few occasional blinks are normal as data packets can and do collide and retries are automatically
generated, however LED4 should not blink very often.
Classic Power
CAN BUS Activity
MODBUS Receive
MODBUS Error
MODBUS Transmit
