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Modbus

The Solera SYSTEMS Controller can be accessed through the Modbus RTU protocol over the RS-485 port. You can set-up the RS-485 port with fsrc command.

Example:

fsrc 0 cfg485wr 1 9600 1 0 1

Set Modbus RTU, Baudrate: 9600bps, 1 Stop Bit, parity: None, slave address base: 1

fsrc -h cfg485wr

display the full set of options

Slave Address

The three address jumpers have a dual purpose. When the card is accessed from a Raspberry Pi, the jumpers define the offset of the I2C address, permitting stacking of up to 8 cards. When the card is accessed through the MODBUS protocol over the RS-485 port, the jumpers define the offset of the RS-485 base address set by the software.

Modbus object types

All Modbus RTU object types with standard addresses are implemented: Coils, Discrete Inputs, Input registers, Holding registers.

Coils

Access level Read/Write, Size 1 bit

Device function Register Address Modbus Address Description
COIL_OD1 0001 0x00 Open drain #1 control
COIL_OD2 0002 0x01 Open drain #2 control
COIL_OD3 0003 0x02 Open drain #3 control
COIL_OD4 0004 0x03 Open drain #4 control
COIL_OD5 0005 0x04 Open drain #5 control
COIL_OD6 0006 0x05 Open drain #6 control
COIL_OD7 0007 0x06 Open drain #7 control
COIL_OD8 0008 0x07 Open drain #8 control
COIL_OPT_RISING1 0009 0x08 Opto input #1 rising edges enable counting
COIL_OPT_RISING2 0010 0x09 Opto input #2 rising edges enable counting
COIL_OPT_RISING3 0011 0x0a Opto input #3 rising edges enable counting
COIL_OPT_RISING4 0012 0x0b Opto input #4 rising edges enable counting
COIL_OPT_FALLING1 0013 0x0c Opto input #1 falling edges enable counting
COIL_OPT_FALLING2 0014 0x0d Opto input #2 falling edges enable counting
COIL_OPT_FALLING3 0015 0x0e Opto input #3 falling edges enable counting
COIL_OPT_FALLING4 0016 0x0f Opto input #4 falling edges enable counting

Discrete Inputs

Access level Read Only, Size 1 bit

Device function Register Address Modbus Address Description
DI_OPT1 10001 0x00 input #1 state
DI_OPT2 10002 0x01 input #2 state
DI_OPT3 10003 0x02 input #3 state
DI_OPT4 10004 0x03 input #4 state

Input registers

Access level Read Only, Size 16 bits

Device function Register Address Modbus Address Measurement Unit Description
IR_0_5IN1 30001 0x00 mV 0-5V input value for ch #1
IR_0_5IN1 30002 0x01 mV 0-5V input value for ch #2
IR_0_5IN1 30003 0x02 mV 0-5V input value for ch #3
IR_0_5IN1 30004 0x03 mV 0-5V input value for ch #4
IR_0_5IN1 30005 0x04 mV 0-5V input value for ch #5
IR_0_5IN1 30006 0x05 mV 0-5V input value for ch #6
IR_0_5IN1 30007 0x06 mV 0-5V input value for ch #7
IR_0_5IN1 30008 0x07 mV 0-5V input value for ch #8
IR_0_5IN1 30009 0x08 mV 0-5V input value for ch #9
IR_0_5IN1 300010 0x09 mV 0-5V input value for ch #10
IR_0_5IN1 300011 0x0a mV 0-5V input value for ch #11
IR_0_5IN1 300012 0x0b mV 0-5V input value for ch #12
IR_OPT_CNT1 30013 0x0c Opto input channel #1 counter value
IR_OPT_CNT2 30014 0x0d Opto input channel #2 counter value
IR_OPT_CNT3 30015 0x0e Opto input channel #3 counter value
IR_OPT_CNT4 30016 0x0f Opto input channel #4 counter value
IR_OWB_TEMP1 30017 0x10 °C x 100 OWB sensor #1 temperature
IR_OWB_TEMP2 30018 0x10 °C x 100 OWB sensor #2 temperature
IR_OWB_TEMP3 30019 0x10 °C x 100 OWB sensor #3 temperature
IR_OWB_TEMP4 30020 0x10 °C x 100 OWB sensor #4 temperature
IR_OWB_TEMP5 30021 0x10 °C x 100 OWB sensor #5 temperature
IR_OWB_TEMP6 30022 0x10 °C x 100 OWB sensor #6 temperature
IR_OWB_TEMP7 30023 0x10 °C x 100 OWB sensor #7 temperature
IR_OWB_TEMP8 30024 0x10 °C x 100 OWB sensor #8 temperature
IR_OWB_TEMP9 30025 0x10 °C x 100 OWB sensor #9 temperature
IR_OWB_TEMP10 30026 0x10 °C x 100 OWB sensor #10 temperature
IR_OWB_TEMP11 30027 0x10 °C x 100 OWB sensor #11 temperature
IR_OWB_TEMP12 30028 0x10 °C x 100 OWB sensor #12 temperature
IR_OWB_TEMP13 30029 0x10 °C x 100 OWB sensor #13 temperature
IR_OWB_TEMP14 30030 0x10 °C x 100 OWB sensor #14 temperature
IR_OWB_TEMP15 30031 0x10 °C x 100 OWB sensor #15 temperature
IR_OWB_TEMP16 30032 0x10 °C x 100 OWB sensor #16 temperature

Holding registers

Access level Read/Write, Size 16 bits

Device function Register Address Modbus Address Measurement Unit Range Description
HR_0_10V_OUT1 40001 0x00 mV 0..10000 0-10V Output Channel #1 value
HR_0_10V_OUT2 40002 0x01 mV 0..10000 0-10V Output Channel #2 value
HR_PWM_OD_OUT1 40003 0x02 % x 100 0..10000 PWM OD #1 fill factor
HR_PWM_OD_OUT2 40004 0x03 % x 100 0..10000 PWM OD #2 fill factor
HR_PWM_OD_OUT3 40005 0x04 % x 100 0..10000 PWM OD #3 fill factor
HR_PWM_OD_OUT4 40006 0x05 % x 100 0..10000 PWM OD #4 fill factor

Function codes implemented

  • Read Coils (0x01)
  • Read Discrete Inputs (0x02)
  • Read Holding Registers (0x03)
  • Read Input Registers (0x04)
  • Write Single Coil (0x05)
  • Write Single Register (0x06)
  • Write Multiple Coils (0x0f)
  • Write Multiple registers (0x10)