I/O Modules: MINI – RS Series – iSMA-Controlli

Supports Modbus RTU/ASCII and BACnet MS/TP protocols with built-in algorithms for lighting, cooling, and heating, enabling use as standalone controllers or as part of a larger BMS.

Application

Ideal for building automation, including lighting, cooling, and heating control.
Suitable for projects requiring manually operated switches and standalone control capabilities.
Used as extensions for controllers in both new and existing BMS installations, particularly for occupancy sensor applications.

iSMA-B-MINI-RS_Datasheet_DBL678en_V1.0 iSMA-B-8U_Installation_instruction_DIM422en_v3.3 iSMA-B-8I_Installation_instruction_DIM420en_v3.3 iSMA-B-4U4O-H_Installation_instruction_DIM418en_v3.3 iSMA-B-4TO-H_Installation_instruction_DIM414en_v3.3 iSMA-B-4O-H_Installation_instruction_DIM412en_v3.3 iSMA-B-4I4O-H_Installation_instruction_DIM410en_v3.3 iSMA-B-4U4A-H_Installation_instruction_DIM416en_v3.4

(+84) 903 999 357

The MINI-RS series multiprotocol I/O modules are compact remote I/O devices that extend building controllers with inputs and outputs over RS485 using open protocols such as BACnet MS/TP and Modbus RTU/ASCII. They are designed for easy integration with BMS, offering a cost-effective solution for building control systems.

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Specification

Model:		4U-4A-H	8U	4U4O-H	4I-4O-H	8I	4O-H	4TO-H
Power supply:		24 V AC/DC ± 20%
Universal inputs:	Number of inputs:	4	8	4	...	...	...	...
	Voltage input:	Voltage measurement: 0-10 V DC Input impedance: 100 kΩ Measurement accuracy: ±0.1% Measurement resolution: 3 mV at 12-bit and 1 mV at 16-bit			...	...	...	...
	Current input:	Current measurement: 0-20 mA Required external resistor: 200 Ω Measurement accuracy: ±1.1% Measurement resolution: 15 µA at 12-bit and 5 µA at 16-bit			...	...	...	...
	Digital input:	Output current ~1 mAi			...	...	...	...
	Resistance input:	Measurement of resistance: 0-1000 kΩ Measurement resolution for 20 kΩ load: 20 Ω at 12-bit and 1 Ω at 16-bit Measurement resolution for PT1000 and NI1000: 0.1 Ω at 16-bit Resistance measurement method: voltage divider			...	...	...	...
	Temperature input:	Measurement with RTDS (Real Time Digital Simulator) attached Accuracy: ±0.1˚C The PT1000 and NI1000 sensors use 16-bit resolution			...	...	...	...
	Measurement resolution:	12-bit (default), 16-bit			...	...	...	...
	Processing time:	10 ms/channel at 12-bit 140 ms/channel at 16-bit			...	...	...	...
Digital inputs:	Number of inputs	...	...	...	4	8	...	...
	Type:	...	...	...	Dry contact or fast pulse counter		...	...
	Maximum input frequency:	...	...	...	100 Hz saved in the EEPROM memory		...	...
Analog outputs:	Number of outputs	4	...	...	...	...	...	...
	Voltage range:	0-10 V DC	...	...	...	...	...	...
	Maximum load current:	20 mA	...	...	...	...	...	...
	Resolution:	12-bit	...	...	...	...	...	...
	Accuracy:	±0.5%	...	...	...	...	...	...
Digital outputs:	Number of outputs	...	...	...	...	...	4	...
	Resistive load (AC1):	...	...	UL compliant ratings: 3 A at 24 V AC 3 A at 30 V DC Maximum ratings: 3 A at 230 V AC 3 A at 30 V DC		...	UL compliant ratings: 8 A at 230 V AC 8 A at 30 V DC Maximum ratings: 8 A at 230 V AC 8 A at 30 V DC	...
	Inductive load (AC3):	...	...	UL compliant ratings: 8 VA at 24 V AC 30 W at 30 V DC Maximum ratings: 75 VA at 230 V AC 30 W at 30 V DC		...	UL compliant ratings: 37 VA at 230 V AC 90 W at 30 V DC Maximum ratings: 360 VA at 230 V AC 90 W at 30 V DC	...
Triac outputs:	Number of outputs:	...	...	...	...	...	...	4TO-H
	Load:	...	...	...	...	...	...	0.5 A at 20 V AC up to max. 250 V AC
	Peak load per channel:	...	...	...	...	...	...	1.5 A at 20 V AC up to max. 250 V AC (30 s)
	Gate control:	...	...	...	...	...	...	Zero crossing turn ON
	Frequency range:	...	...	...	...	...	...	47 to 63 Hz
	Snubber:	...	...	...	...	...	...	Snubberless triac
COM1:	RS485 interface	Half-duplex, Up to 128 devices
	Communication protocol	Modbus RTU/ASCII, BACnet MS/TP
	Ports	Screw connector
	Baud rate	2400-115200
	Address	0-99 set by a rotary switch
USB1	USB 2.0	mini USB type B
Ingress protection	IP rating	IP 40 for indoor installation
Temperature	Storage	-40°C to +85°C (-40°F to +185°F)
Temperature	Operating	-10°C to +50°C (14°F to 122°F)
Humidity	Relative	5 to 95% RH (without condensation)
Screw connectors	Type	Removable screw terminals
Screw connectors	Maximum cable size	2.5 mm2 (18…12 AWG)
Housing	Material	Self-extinguishing plastic (PC/ABS)
Housing	Mounting	DIN (DIN EN 50022 norm)
Dimensions	Width	36.30 mm/1.43 in
	Length	114.40 mm/4.39 in
	Height	Without hand switch: 62.00 mm/2.44 in \|\| With hand switch: 68.70 mm/2.70 in

Feature

7 different types of modules with RS485 communication
BACnet MS/TP, BACnet Slave, and Modbus RTU/ASCII protocols, selected with a DIP switch
Compact dimensions
Manual override switches*
Built-in HVAC and light applications**
All digital inputs work as fast counters up to 100 Hz
Universal inputs have 16-bit resolution, which increases the accuracy of measurement
Wide range of supported temperature sensors in Celsius and Fahrenheit degrees (NTC, PT1000, etc.)
Automatic detection of a signal type of universal inputs
Digital outputs 230 V AC max. 3 A or 8 A allow for direct control without additional relays
Triac outputs: 0.5 A at 24 V AC, 0.5 A at 230 V AC
Analog output with max. 20 mA load per channel allows for a direct control of relays (12 V DC) or SSR with PWM support
LEDs indicate the status of inputs and outputs
Simple and fast addressing from 0 to 99 using rotary switches
UL listed
BTL certified