Blue Sky UCM - Manual (Page 18)

Blue Sky Energy – Universal Communication Module
17
Supported MODBUS Functions
1) Read Coils (0x01), Read Discrete Inputs (0x02)
Query Packet:
Slave address | Function code 0x02 or 0x03 | MSB starting address | LSB address |
MSB number of points | LSB number of points | LSB CRC | MSB CRC
Response Packet:
Slave address | Function code 0x02 or 0x03 | Number of data bytes always 1 |
Bit packed status, LS bit status of addressed point | LSB CRC | MSB CRC
READ COILS
PDU ADDRESS LOGICAL COIL # DESCRIPTION
0x0000 1 Charge Efficiency Mode, 0 = Auto, 1 = Fixed
0x0001 2 Aux Out Mode, 0 = Volts, 1 = Amp-Hours
0x0002 3 Aux Out State, 0 = Off, 1 = On
0x0003 4 Temperature Sensor, 0 = Bad or missing
TABLE 4
2a) Read Holding Registers (0x03), Read Input Registers (0x04)
Query Packet:
Slave address | Function code = 0x03 or 0x04 | MSB starting register address | LSB address |
MSB number of registers | LSB number of registers | LSB CRC | MSB CRC
Response Packet:
Slave address | Function code = 0x03 or 0x04 | number of data bytes | MSB of first register’s contents |
LSB of first register’s contents | … contents of more registers… | LSB CRC | MSB CRC
2b) Preset Single Register (0x06)
Used for changing all charge controller and IPN-ProRemote setpoints.
Query Packet:
Slave Address | Function = 0x06 | MSB register address | LSB register address |
MSB preset data | LSB preset data | LSB CRC | MSB CRC
Response Packet:
Slave Address | Function = 0x06 | MSB register address | LSB register address |
MSB preset data | LSB preset data | LSB CRC | MSB CRC
MODBUS REGISTERS
PDU
ADDRESS
LOGICAL
REGISTER #
FUNCTION
CODES
DESCRIPTION UNITS SCALING
0x0000 1 3, 4 Charge State Coded 0 = Off 1 = Acceptance
2 = Float 3 = Equalize
4 = Bulk
0x0001 2 3, 4 Battery Volts V X10
0x0002 3 3, 4 Net Battery Amps, signed A X10
0x0003 4 3, 4 Sum of Input Amps from All Controllers A X10
0x0004 5 3, 4 Sum of Output Amps from All Controllers A X10
0x0005 6 3, 4 % Remaining Battery Capacity % None. Data valid following
first switch to Float
0x0006 7 3, 4 Battery Amp-Hours from Full, sent
unsigned A None. Data valid following
first switch to Float
0x0007 8 3, 4 Aux. Battery Volts from Master, also
functions in Load Control mode V X10
0x0008 9 3, 4 Remaining Equalize Time Hours X10
0x0009 10 3, 4 Days Since Last Full Charge Days none
0x000A 11 3, 4 Days Since Last Equalize Days none
0x000B 12 3, 4 Max. Battery Voltage Detected V X10
0x000C 13 3, 4 Min. Battery Voltage Detected V X10