The Building Automation I/O Expansion cards for Raspberry Pi can be accessed thru Modbus RTU protocol over RS-485 port. You can set-up the RS-485 port with megabas command.
Example:
~$ megabas 0 rs485wr 1 9600 1 0 1Set Modbus RTU , Baudrate: 9600bps, 1 Stop Bit, parity: None, slave address offset: 1
~$ megabas -h rs485wrdisplay the full set of options
The slave address is add with the "stack level" jumpers. For example the jumpers configuration for stack level 1 (one jumper in position ID0) slave address offset to 1 corespond to slave address 2.
All modbus RTU object type with standard addresses are implemented : Coils, Discrete Inputs, Input registers, Holding registers.
Acces level Read/Write, Size 1 bit
| Device function | Register Address | Modbus Address |
|---|---|---|
| TRIAC_1 | 0001 | 0x00 |
| TRIAC_2 | 0002 | 0x01 |
| TRIAC_3 | 0003 | 0x02 |
| TRIAC_4 | 0004 | 0x03 |
| DRY_CONTACT_RISING_COUNT_ENABLE_CH1 | 0005 | 0x04 |
| DRY_CONTACT_RISING_COUNT_ENABLE_CH2 | 0006 | 0x05 |
| DRY_CONTACT_RISING_COUNT_ENABLE_CH3 | 0007 | 0x06 |
| DRY_CONTACT_RISING_COUNT_ENABLE_CH4 | 0008 | 0x07 |
| DRY_CONTACT_RISING_COUNT_ENABLE_CH5 | 0009 | 0x08 |
| DRY_CONTACT_RISING_COUNT_ENABLE_CH6 | 0010 | 0x09 |
| DRY_CONTACT_RISING_COUNT_ENABLE_CH7 | 0011 | 0x0a |
| DRY_CONTACT_RISING_COUNT_ENABLE_CH8 | 0012 | 0x0b |
| DRY_CONTACT_FALLING_COUNT_ENABLE_CH1 | 0013 | 0x0c |
| DRY_CONTACT_FALLING_COUNT_ENABLE_CH2 | 0014 | 0x0d |
| DRY_CONTACT_FALLING_COUNT_ENABLE_CH3 | 0015 | 0x0e |
| DRY_CONTACT_FALLING_COUNT_ENABLE_CH4 | 0016 | 0x0f |
| DRY_CONTACT_FALLING_COUNT_ENABLE_CH5 | 0017 | 0x10 |
| DRY_CONTACT_FALLING_COUNT_ENABLE_CH6 | 0018 | 0x11 |
| DRY_CONTACT_FALLING_COUNT_ENABLE_CH7 | 0019 | 0x12 |
| DRY_CONTACT_FALLING_COUNT_ENABLE_CH8 | 0020 | 0x13 |
Access level Read Only, Size 1 bit
| Device function | Register Address | Modbus Address |
|---|---|---|
| DRY_CONTACT_1 | 10001 | 0x00 |
| DRY_CONTACT_2 | 10002 | 0x01 |
| DRY_CONTACT_3 | 10003 | 0x02 |
| DRY_CONTACT_4 | 10004 | 0x03 |
| DRY_CONTACT_5 | 10005 | 0x04 |
| DRY_CONTACT_6 | 10006 | 0x05 |
| DRY_CONTACT_7 | 10007 | 0x06 |
| DRY_CONTACT_8 | 10008 | 0x07 |
Access level Read Only, Size 16 bits
| Device function | Register Address | Description | Measurement Unit |
|---|---|---|---|
| 0-10V_IN_1 | 30001 | 0 - 10V input channel 1 | mV |
| 0-10V_IN_2 | 30002 | 0 - 10V input channel 2 | mV |
| 0-10V_IN_3 | 30003 | 0 - 10V input channel 3 | mV |
| 0-10V_IN_4 | 30004 | 0 - 10V input channel 4 | mV |
| 0-10V_IN_5 | 30005 | 0 - 10V input channel 5 | mV |
| 0-10V_IN_6 | 30006 | 0 - 10V input channel 6 | mV |
| 0-10V_IN_7 | 30007 | 0 - 10V input channel 7 | mV |
| 0-10V_IN_8 | 30008 | 0 - 10V input channel 8 | mV |
| 1K_R_IN_1 | 30009 | 1K thernistor resistance channel 1 | ohm |
| 1K_R_IN_2 | 30010 | 1K thernistor resistance channel 2 | ohm |
| 1K_R_IN_3 | 30011 | 1K thernistor resistance channel 3 | ohm |
| 1K_R_IN_4 | 30012 | 1K thernistor resistance channel 4 | ohm |
| 1K_R_IN_5 | 30013 | 1K thernistor resistance channel 5 | ohm |
| 1K_R_IN_6 | 30014 | 1K thernistor resistance channel 6 | ohm |
| 1K_R_IN_7 | 30015 | 1K thernistor resistance channel 7 | ohm |
| 1K_R_IN_8 | 30016 | 1K thernistor resistance channel 8 | ohm |
| 10K_R_IN_1 | 30017 | 10K thernistor resistance channel 1 | ohm |
| 10K_R_IN_2 | 30018 | 10K thernistor resistance channel 2 | ohm |
| 10K_R_IN_3 | 30019 | 10K thernistor resistance channel 3 | ohm |
| 10K_R_IN_4 | 30020 | 10K thernistor resistance channel 4 | ohm |
| 10K_R_IN_5 | 30021 | 10K thernistor resistance channel 5 | ohm |
| 10K_R_IN_6 | 30022 | 10K thernistor resistance channel 6 | ohm |
| 10K_R_IN_7 | 30023 | 10K thernistor resistance channel 7 | ohm |
| 10K_R_IN_8 | 30024 | 10K thernistor resistance channel 8 | ohm |
| DRY_CONTACT_EDGE_COUNTER_CH1 | 30025 | Edge counter ch1 | - |
| DRY_CONTACT_EDGE_COUNTER_CH2 | 30026 | Edge counter ch2 | - |
| DRY_CONTACT_EDGE_COUNTER_CH3 | 30027 | Edge counter ch3 | - |
| DRY_CONTACT_EDGE_COUNTER_CH4 | 30028 | Edge counter ch4 | - |
| DRY_CONTACT_EDGE_COUNTER_CH5 | 30029 | Edge counter ch5 | - |
| DRY_CONTACT_EDGE_COUNTER_CH6 | 30030 | Edge counter ch6 | - |
| DRY_CONTACT_EDGE_COUNTER_CH7 | 30031 | Edge counter ch7 | - |
| DRY_CONTACT_EDGE_COUNTER_CH8 | 30032 | Edge counter ch8 | - |
| OWB_TEMP1 | 30033 | Temperature 1 | 0.01C |
| OWB_TEMP2 | 30034 | Temperature 2 | 0.01C |
| OWB_TEMP3 | 30035 | Temperature 3 | 0.01C |
| OWB_TEMP4 | 30036 | Temperature 4 | 0.01C |
| OWB_TEMP5 | 30037 | Temperature 5 | 0.01C |
| OWB_TEMP6 | 30038 | Temperature 6 | 0.01C |
| OWB_TEMP7 | 30039 | Temperature 7 | 0.01C |
| OWB_TEMP8 | 30040 | Temperature 8 | 0.01C |
| OWB_TEMP9 | 30041 | Temperature 9 | 0.01C |
| OWB_TEMP10 | 30042 | Temperature 10 | 0.01C |
| OWB_TEMP11 | 30043 | Temperature 11 | 0.01C |
| OWB_TEMP12 | 30044 | Temperature 12 | 0.01C |
| OWB_TEMP13 | 30045 | Temperature 13 | 0.01C |
| OWB_TEMP14 | 30046 | Temperature 14 | 0.01C |
| OWB_TEMP15 | 30047 | Temperature 15 | 0.01C |
| OWB_TEMP16 | 30048 | Temperature 16 | 0.01C |
| OWB_ID_A_TEMP1 | 30049 | ID A Temperature 1 | 64 bit ID |
| OWB_ID_B_TEMP1 | 30050 | ID B Temperature 1 | |
| OWB_ID_C_TEMP1 | 30051 | ID C Temperature 1 | |
| OWB_ID_D_TEMP1 | 30052 | ID D Temperature 1 | |
| OWB_ID_A_TEMP2 | 30053 | ID A Temperature 2 | 64 bit ID |
| OWB_ID_B_TEMP2 | 30054 | ID B Temperature 2 | |
| OWB_ID_C_TEMP2 | 30055 | ID C Temperature 2 | |
| OWB_ID_D_TEMP2 | 30056 | ID D Temperature 2 | |
| OWB_ID_A_TEMP3 | 30057 | ID A Temperature 3 | 64 bit ID |
| OWB_ID_B_TEMP3 | 30058 | ID B Temperature 3 | |
| OWB_ID_C_TEMP3 | 30059 | ID C Temperature 3 | |
| OWB_ID_D_TEMP3 | 30060 | ID D Temperature 3 | |
| OWB_ID_A_TEMP4 | 30061 | ID A Temperature 4 | 64 bit ID |
| OWB_ID_B_TEMP4 | 30062 | ID B Temperature 4 | |
| OWB_ID_C_TEMP4 | 30063 | ID C Temperature 4 | |
| OWB_ID_D_TEMP4 | 30064 | ID D Temperature 4 | |
| OWB_ID_A_TEMP5 | 30065 | ID A Temperature 5 | 64 bit ID |
| OWB_ID_B_TEMP5 | 30066 | ID B Temperature 5 | |
| OWB_ID_C_TEMP5 | 30067 | ID C Temperature 5 | |
| OWB_ID_D_TEMP5 | 30068 | ID D Temperature 5 | |
| OWB_ID_A_TEMP6 | 30069 | ID A Temperature 6 | 64 bit ID |
| OWB_ID_B_TEMP6 | 30070 | ID B Temperature 6 | |
| OWB_ID_C_TEMP6 | 30071 | ID C Temperature 6 | |
| OWB_ID_D_TEMP6 | 30072 | ID D Temperature 6 | |
| OWB_ID_A_TEMP7 | 30073 | ID A Temperature 7 | 64 bit ID |
| OWB_ID_B_TEMP7 | 30074 | ID B Temperature 7 | |
| OWB_ID_C_TEMP7 | 30075 | ID C Temperature 7 | |
| OWB_ID_D_TEMP7 | 30076 | ID D Temperature 7 | |
| OWB_ID_A_TEMP8 | 30077 | ID A Temperature 8 | 64 bit ID |
| OWB_ID_B_TEMP8 | 30078 | ID B Temperature 8 | |
| OWB_ID_C_TEMP8 | 30079 | ID C Temperature 8 | |
| OWB_ID_D_TEMP8 | 30080 | ID D Temperature 8 | |
| OWB_ID_A_TEMP9 | 30081 | ID A Temperature 9 | 64 bit ID |
| OWB_ID_B_TEMP9 | 30082 | ID B Temperature 9 | |
| OWB_ID_C_TEMP9 | 30083 | ID C Temperature 9 | |
| OWB_ID_D_TEMP9 | 30084 | ID D Temperature 9 | |
| OWB_ID_A_TEMP10 | 30085 | ID A Temperature 10 | 64 bit ID |
| OWB_ID_B_TEMP10 | 30086 | ID B Temperature 10 | |
| OWB_ID_C_TEMP10 | 30087 | ID C Temperature 10 | |
| OWB_ID_D_TEMP10 | 30088 | ID D Temperature 10 | |
| OWB_ID_A_TEMP11 | 30089 | ID A Temperature 11 | 64 bit ID |
| OWB_ID_B_TEMP11 | 30090 | ID B Temperature 11 | |
| OWB_ID_C_TEMP11 | 30091 | ID C Temperature 11 | |
| OWB_ID_D_TEMP11 | 30092 | ID D Temperature 11 | |
| OWB_ID_A_TEMP12 | 30093 | ID A Temperature 12 | 64 bit ID |
| OWB_ID_B_TEMP12 | 30094 | ID B Temperature 12 | |
| OWB_ID_C_TEMP12 | 30095 | ID C Temperature 12 | |
| OWB_ID_D_TEMP12 | 30096 | ID D Temperature 12 | |
| OWB_ID_A_TEMP13 | 30097 | ID A Temperature 13 | 64 bit ID |
| OWB_ID_B_TEMP13 | 30098 | ID B Temperature 13 | |
| OWB_ID_C_TEMP13 | 30099 | ID C Temperature 13 | |
| OWB_ID_D_TEMP13 | 30100 | ID D Temperature 13 | |
| OWB_ID_A_TEMP14 | 30101 | ID A Temperature 14 | 64 bit ID |
| OWB_ID_B_TEMP14 | 30102 | ID B Temperature 14 | |
| OWB_ID_C_TEMP14 | 30103 | ID C Temperature 14 | |
| OWB_ID_D_TEMP14 | 30104 | ID D Temperature 14 | |
| OWB_ID_A_TEMP15 | 30105 | ID A Temperature 15 | 64 bit ID |
| OWB_ID_B_TEMP15 | 30106 | ID B Temperature 15 | |
| OWB_ID_C_TEMP15 | 30107 | ID C Temperature 15 | |
| OWB_ID_D_TEMP15 | 30108 | ID D Temperature 15 | |
| OWB_ID_A_TEMP16 | 30109 | ID A Temperature 16 | 64 bit ID |
| OWB_ID_B_TEMP16 | 30110 | ID B Temperature 16 | |
| OWB_ID_C_TEMP16 | 30111 | ID C Temperature 16 | |
| OWB_ID_D_TEMP16 | 30112 | ID D Temperature 16 |
Access level Read/Write, Size 16 bits
| Device function | Register Address | Modbus Address | Measurement Unit |
|---|---|---|---|
| 0-10V_OUT_1 | 40001 | 0x00 | mV |
| 0-10V_OUT_2 | 40002 | 0x01 | mV |
| 0-10V_OUT_3 | 40003 | 0x02 | mV |
| 0-10V_OUT_4 | 40004 | 0x03 | mV |
- 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)