Modbus for Residential units User Manual Document in original language D24810-EN_GB 10-02-2017 A007
Contents 1 Introduction ............................................................................................................................... 1 2 Transmission modes .................................................................................................................. 1 3 Physical layer ............................................................................................................................ 1 4 Address ..................................................................
1 Introduction The unit works as a Modbus slave and complied with MODBUS over serial line specification and implementation guide V1.0 if nothing else is mention in this manual. 2 Transmission modes Modbus RTU. Supported function codes: 1: Read Coils 2: Read Discrete Input 3: Read Holding Register 4: Read Input Register 5: Write Single Coil 6: Write Single Register 15: Write Multiple Coils 16: Write Multiple Registers 3 Physical layer Two wire RS-485.
The column “NVM” indicates if the value is stored in a non-volatile memory (i.e. EEPROM) when writing to it. 6 Wiring Fig. 1 Modbus wiring Position 1 2 3 4 Description VTC unit. RJ45 on PCB, seen from the top. Termination resistor, close to the end of the line. Modbus master. 7 Modbus variable list 7.1 Registers for fan control Name Register address R or R/W NVM Access (Reg.
Name Register address R or R/W NVM Access (Reg./Coil) Description/remarks REG_FAN_FLOW_UNITS 108 R/W Y Reg 0: l/s REG_FAN_SF_PWM 109 R Reg 0..100: 0-10V REG_FAN_EF_PWM 110 R Reg 0..100: 0-10V REG_FAN_SF_RPM 111 R Reg Rotations per minute REG_FAN_EF_RPM 112 R Reg Rotations per minute REG_FAN_ALLOW_MANUAL_FAN_STOP 114 R/W Reg + Coil Coil 1809: manual fan stop allowed. 1: m3/h Y 0: CD cannot set fan speed to off. 1: CD can set fan speed to off.
Name Register address R or R/W NVM Access (Reg./Coil) Description/remarks REG_FAN_SYSTEM_CURVE_EF 137 R/W Y Reg System curve for extract fan. Value can be from 1 to 10. REG_FAN_CONTROL_TYPE 138 R/W Reg Type of fan control: 0: Air flow 1: Speed 139 REG_FAN_INTERLOCK R Reg Interlock NO relay state: 0: Relay off 1: Relay active 1. Stored by writing to register 549 (REG_STORE_NVM). 7.2 Registers for heater control Name Register address R or R/W NVM Scaling Access (Reg.
Name Register address R or R/W REG_HC_TEMP_IN3 216 REG_HC_TEMP_IN4 NVM Scaling Access (Reg./Coil) Description/remarks R 10 Reg Temperature on sensor 3 * 10. Exhaust air sensor/Preheater sensor. 217 R 10 Reg Temperature on sensor 4 * 10. Overheating/Frost protection sensor. REG_HC_TEMP_IN5 218 R 10 Reg Temperature on sensor 5 * 10. Outdoor air sensor.
7.3 Registers for the damper Name Register address R or R/W REG_DAMPER_PWM 301 R NVM Access (Reg./Coil) Description/remarks Reg Output value for exchanger. 0-100 correspond to 0 to 10V. Access (Reg./Coil) Description/remarks Reg State for the rotor control state machine. 7.4 Registers for the rotor Name Register address R or R/W REG_ROTOR_STATE 351 R NVM 0: Normal 1: Rotor fault assumed 2: Rotor fault detected 3: Summer mode conditions valid, but summer mode not yet active.
7.6 Registers for the week program Name Register address R or R/W REG_WP_ACTIVE 401 R NVM Access (Reg./Coil) Description/remarks Reg + Coil Coil address: 6401 0: week program not active 1: week program active REG_WP_ON_LVL 402 R/W Y Reg Week program active speed level. REG_WP_OFF_LVL 403 R/W Y Reg Week program inactive speed level.
Name Register address R or R/W NVM Access (Reg.
Name Register address R or R/W REG_SYSTEM_PROG_V_LOW 504 REG_SYSTEM_BOOT_PROG_V_HIGH NVM Access (Reg.
Name Register address R or R/W REG_SYSTEM_CDX_PROG_V_L 526 R NVM Access (Reg./Coil) Description/remarks Reg CDx program version, low number Note: contains the program version of the CDx panel operated latest. If the CDx is not operated since power on, the value is 0.
7.10 Registers for VTC defrosting Name Register address R or R/W REG_DEFR_STATE_VTC 651 R NVM Access (Reg./Coil) Description/remarks Reg State of defrosting state machine. 0: No defrosting ongoing 2: Bypass defrosting 3: Stop defrosting 4: Defrost error REG_DEFR_CONFIGURATION 652 R Reg Defrosting configuration. 0: A 1: B 2: C (no longer supported by PCU-EC4) 3: D (no longer supported by PCU-EC4) REG_DEFR_UNBAL_ALLOWED 653 Y R/W Reg + Coil Coil 10433: Unbalance allowed.
7.12 Registers for the digital inputs Name Register address R or R/W REG_DI_ALL 701 R/W NVM Access (Reg./Coil) Description/remarks Reg + Coil When writing: activation of the functions connected to the digital inputs. 0: deactive input. 1: activate input. When reading: obtaining of the values on the physical inputs on the PCU-EC4 card. 0: actual input is not active, i.e. the input is not connected to signal GND. 1: actual input is active, i.e. the input is connected to signal GND.
Name Register address R or R/W REG_DI_FUNCTIONS 710 R NVM Access (Reg./Coil) Description/remarks Reg Functions active due to activated digital inputs. Bit 0: input 1 (DI1) Bit 1: input 2 (DI2) Bit 2: input 3 (DI3) Bit 3: input 4 (Heater on/off) Bit 4: input 5 (Extended running/Boost mode) Bit 5: input 6 (Rotor/Damper). Bit 6: input 7 (Home Leave/Away) Bit 7: not used. REG_DI_MODBUS 711 R Reg Latest value written to register REG_DI_ALL.
7.13 Registers for PCU-PB Name Register address R or R/W REG_PCU_PB_RELAYS 751 R NVM Access (Reg.
7.14 Registers for alarms Name Register address R or R/W REG_ALARMS_ALL 801 R NVM Access (Reg.
7.15 Register for demand control Name Register address R or R/W REG_DEMC_CO2_SP 851 R/W NVM Access (Reg./Coil) Description/remarks Reg Range: 0-2000 0: Off REG_DEMC_CO2_P_BAND 852 R/W Reg Range: 1-2000 REG_DEMC_CO2_I_TIME 853 R/W Reg Range:1-120 0: no integration REG_DEMC_RH_SP_SUMMER 854 Reg R/W Range: 0-100 0: Off Note: old register name (before PCU-EC4 program version 5.09.
7.16 Register for wireless network Name Register address R or R/W REG_WL_NODE_1_TYPE 901 R NVM Access (Reg./Coil) Description/remarks Reg 0: No connected 1: CO2 sensor 2: RH sensor 3: DI module 4: User interface REG_WL_NODE_1_VALUE_T 902 R Reg + Coil Value depending on node type: REG_WL_NODE_1_TYPE = 1: CO2 value REG_WL_NODE_1_TYPE = 2: RH value REG_WL_NODE_1_TYPE = 3: use coils to read: Coil Address 14417: input 1 Coil Address 14418: input 2 All other node types: 0.
Name Register address REG_WL_DI_CONNECTION_6 1006 As for REG_WL_DI_CONNECTION_1 REG_WL_DI_CONNECTION_7 1007 As for REG_WL_DI_CONNECTION_1 REG_WL_DI_CONNECTION_8 1008 As for REG_WL_DI_CONNECTION_1 REG_WL_DI_CONNECTION_9 1009 As for REG_WL_DI_CONNECTION_1 REG_WL_DI_CONNECTION_10 1010 As for REG_WL_DI_CONNECTION_1 R or R/W NVM Access (Reg.
Modbus for Residential units D24810 19 User Manual Systemair Sverige AB
lastpage Systemair Sverige AB reserves the right to make changes and improvements to the contents of this manual without prior notice. Systemair Sverige AB Industrivägen 3 SE-739 30 Skinnskatteberg, Sweden Phone +46 222 440 00 Fax +46 222 440 99 www.systemair.
