[Collection type]：Analog
[Collection range]：0mA~20mA
[Interface Type]：RS485
[Number of acquisition channels]：4-channels
[Weight]：245g±5g
[Introduction]：E821-DTU (2I2-400SL) is a remote control device that supports analog follow and control acquisition functions. It supports wireless Modbus RTU protocol in control acquisition mode. The device is simple to use, and users can easily and quickly integrate into their own systems to achieve remote control based on the 433MHz frequency.
| Name | The main parameters | Data |
| RF | Standard frequency band | 433MHz |
| Transmit power | 1W | |
| Hardware | Product size (H*W*D) | 109*175*35mm±1mm |
| product weight | 245g±5g | |
| Operating temperature | -20℃~+70℃ | |
| storage temperature | -40℃~+85℃ | |
| Working humidity | 5%~95% | |
| Storage humidity | 1%~95% | |
| Operating Voltage | 8V~28V | |
| Current acquisition range | 0mA~20mA | |
| Current output range | 0mA~20mA | |
| Precision | 0.2% | |
| Data interface | RS485:9600bps | |
| Software | Operating mode | Following transmit/receive mode, dataacquisition mode, configuration mode |
| Configuration command | Modbus RTU |
| No. | Ports | Function | Description |
| 1 | Ai1+ | Analog signal input channel 1 positive | The input pin of analog signal, which forms input with AI1- |
| 2 | Ai1- | Analog signal input channel 1 negative | Use in pair withAI1+ |
| 3 | Ai2+ | Analog signal input channel 2 positive | The input pin of analog signal, which forms input with AI1- |
| 4 | Ai2- | Analog signal input channel 2 negative | Used in pairs withAI2- |
| 5 | RESET | Reset button | Long press for 5s to reset the device address |
| 6 | 485_A | RS_485 interfaceA | RS_485 interface Ais connected to device Ainterface |
| 7 | 485_B | RS_485 interface B | RS_485 interface B is connected to device B interface |
| 8 | PE | Grounded | Grounded |
| 9 | GND | Press-line power input negative | Power reference ground |
| 10 | VCC | Press-line power input positive | Power input terminal, DC 8V~28V, 12V/24V is recommended |
| 11 | PE | Grounded | Grounded |
| 12 | PWR/RST | Power/reset success indication | Two-color light, blue light is power indicator, green light is resetsuccess indicator |
| 13 | A1 | Wireless transmit/receive data indication | Two-color light, blue light is transmitting data indicator, green lightis receiving data indicator (channel 1) |
| 14 | A0 | Wireless transmit/receive data indication | Two-color light, blue light is transmitting data indication, green lightis receiving data indication (channel 2) |
| 15 | ANT | Antenna interface | 433MHz antenna |
| 16 | M1 and M0 | Mode selection | M1M0(00, 01, 10, 11) |
| 17 | AO2- | Analog signal output channel 2 negative | Used in pairs withAO- |
| 18 | AO2+ | Analog signal output channel 2 positive | The output pin of the analog signal forms an output with AO2- |
| 19 | AO1- | Analog signal output channel 1 negative | Used in pairs withAO+ |
| 20 | AO1+ | Analog signal output channel 1 positive | The output pin of the analog signal forms an output with AO1- |
| Order online |
| 【eBay】：https://www.ebay.com/usr/cdebyte |
| 【Aliexpress】：https://www.aliexpress.com/store/2798183 |
| 【Alibaba】：https://www.alibaba.com |
| For batch order/customized product |
| 【Sales hotline】：+86-28-61399028 Ext.812 |
| 【E-mail】：service@cdebyte.com |
| Technical support |
| 【Submit online】：http://www.ebyte.com/en/apple-technology.aspx |
| 【E-mail】：support@cdebyte.com |
| 产品 型号 | Interface | Acquisition Type | TCP/IP | Ebyte Cloud | - | - | - | Size | Feature | 技术 手册 | 样品 购买 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| E821-DTU(2I2-400SL) | RS485 | Analog | - | 4 working modes | - | - | - | 109*175*35mm±1 | 4-channel analog high-precision acquisition | ||
| E821-RTU(0400-ETH) | RS485 /Ethernet | Digital signal | Support | Support | - | - | - | 108*75*37 | Modbus TCP/RTU |
