Overview
The ARTU100-KJ8 is a remote terminal unit integrating 8 digital inputs and 8 digital outputs. Inputs support active DC12V or dry contact; outputs are normally open relays (AC 250V/3A, DC 30V/3A). Data is transmitted via dual RS485 interfaces with Modbus-RTU protocol, with optional Ethernet, 2G, 4G, LoRa modules. Ideal for power distribution automation, industrial control, and building management requiring local control and remote monitoring.
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Flexible I/O Configuration
- 8 DI (active/passive optional)
- 8 DO (NO relay output)
- DI range: DC12V active/dry contact
- DO capacity: AC250V/3A, DC30V/3A
- Independent channel indication
Reliable Communication
- Dual RS485 ports
- Modbus-RTU protocol
- Baud rate: 1200~38400bps
- Optional Ethernet/2G/4G/LoRa
- Transparent data transmission
Robust Power Supply
- Wide input: AC/DC 85-265V
- DC48V option available
- Low power: ≤9W (main body)
- ≤15W (with 3 modules)
- Stable industrial-grade design
Easy Installation & Indication
- DIN rail / wall mounting
- 20 status LEDs (POW/COM)
- 10-bit DIP switch for setting
- Operating temp: -20~60℃
Function
| Digital Input (DI) | 8 channels, active DC12V or passive dry contact selectable. Real-time status reading via Modbus function code 02H. Debounce time configurable (unit: ms) to eliminate signal jitter. Pulse counting function available for each DI channel. |
| Digital Output (DO) | 8 channels, normally open relay output. Contact capacity: AC 250V/3A, DC 30V/3A. Controlled via Modbus function code 05H or 10H. Output duration can be set (unit: seconds) for timed control. |
| Communication | 2 independent RS485 interfaces, Modbus-RTU protocol. Baud rate: 1200~38400bps, parity and stop bits configurable. Optional Ethernet module (CE) with TCP/IP, 10/100M adaptive. Optional wireless: 2G, 4G, LoRa. |
| Event Recording (SOE) | Up to 100 event records stored cyclically. Each record includes timestamp and channel status. Events triggered by DI/DO state changes. Can be cleared by writing 0xA8B8 to register 0x2100. |
| Parameter Configuration | Modbus registers for device address, baud rate, DI debounce, DO initial state, DO duration, etc. DIP switch for local address/baud rate setting (mode 0) or host computer setting (mode 1). |
| Modbus Function Code Support | 01H: Read DO status 02H: Read DI status 03H/04H: Read registers 05H: Write single DO 10H: Write multiple registers Abnormal response with error codes |
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Specification
| Parameter | Value |
| Power Supply | AC/DC 85～265V or DC 48V |
| Power Consumption | ≤9W (unit only); ≤15W (with 3 modules) |
| Digital Inputs | 8 channels, active DC12V / passive dry contact selectable |
| Digital Outputs | 8 channels, normally open relay |
| DO Contact Capacity | AC 250V/3A, DC 30V/3A |
| Communication | 2 x RS485, Modbus-RTU, baud rate 1200~38400bps |
| Optional Communication | Ethernet (TCP/IP, 10/100M), 2G, 4G, LoRa |
| DIP Switch | 10-bit for address/baud rate/mode setting |
| Status LEDs | 20 indicators (POW, COM, EXT, channel status) |
| Operating Temperature | -20℃ ～ +60℃ |
| Storage Temperature | -40℃ ～ +70℃ |
| Relative Humidity | ≤95% (non-condensing) |
| Altitude | ≤2500m |
| Insulation Resistance | >100MΩ (input/output to case) |
| Dielectric Strength | Power to case: AC 2kV 1min; DI/DO to case: AC 1kV 1min |
| Dimensions (W×H×D) | 90mm × 110mm × 60mm (main body, approximate) |
| Mounting | DIN rail or wall mounting |
| Weight | Approx. 0.3 kg |
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Expansion Modules
| Model | Description | Key Parameters |
| MKA18 | 18-ch digital input (active AC 220V) | AC 220V wet contact |
| MK18 | 18-ch digital input (passive dry contact) | Dry contact, internal power |
| MJ16 | 16-ch digital output (normally open relay) | AC 250V/3A, DC 30V/3A |
| MJC12 | 12-ch digital output (normally closed relay) | AC 250V/3A, DC 30V/3A |
| MA84 | 8-ch analog input + 4-ch analog output | AI: 0-5V/1-5V/0-20mA/4-20mA selectable; AO: same ranges |
| AWT100-WF | WiFi wireless communication terminal | 2.4GHz, 802.11 b/g/n, transparent data transmission |
| AWT100-4G | 4G wireless communication terminal | 4G network, transparent data transmission |
| AWT100-Lora | LoRa wireless communication terminal | 506.5MHz, works with ATC600 receiver |
| AWT100-LW | LoRaWAN wireless communication terminal | LoRaWAN protocol |
| AWT100-CE | Ethernet communication terminal | 10/100M自适应, TCP/IP, Modbus TCP support |
| MPOW | Power module (required when using any expansion module) | Powers the expansion modules |
Up to 3 expansion modules can be connected to one ARTU100-KJ8 main unit.
MPOW power module is mandatory when using any expansion module.
Modules can be mixed according to application requirements.
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FAQ
It supports wide-range power supply: AC/DC 85-265V or DC 48V. Users can select according to site power availability.
For active DC12V, an external 12V supply is required. For passive dry contact, internal power is provided; only the contact needs to be connected. Refer to section 4.3 of the manual for details.
Two methods: 1) Local setting via DIP switch (mode 0); 2) Remote setting via Modbus commands (mode 1). DIP switches 1-5 for address, 6-7 for baud rate, 8 for mode.
Yes. Contact capacity is AC 250V/3A, DC 30V/3A, suitable for small AC loads like indicators, contactor coils. For high-power loads, use an intermediate relay.
Up to 3 modules can be connected. Optional modules include MKA18/MK18 (18 DI), MJ16 (16 DO), MA84 (8 AI + 4 AO). MPOW power module is required.
Read registers starting from 0xD000 via Modbus. There are 100 cyclic records. Each record includes timestamp and channel status. It is recommended to read index at 0xDE00 first, then calculate the target record address.
Summary
Key advantages: 8DI+8DO flexible configuration, reliable dual RS485 communication, wide power supply AC/DC 85-265V, low power ≤9W, expandable up to 3 modules, industrial EMC performance, -20~60℃ operating temperature. Value: Enables real-time status acquisition and control, enhances automation and safety, reduces maintenance costs.
