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# ISO485 {docsify-ignore-all}
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<el-tag effect="plain">SKU:U034</el-tag>
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<div class="product_pic"><img src="assets/img/product_pics/unit/unit_rs485_01.webp"><img src="assets/img/product_pics/unit/unit_rs485_02.webp"></div>
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## Description
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**ISO485** is an isolated half duplex transceiver based on RS485 bus protocol. It can convert TTL level to RS485 level, and various electrical noises and transient changes of voltage and current may appear in the communication link of equipment. Using ca-is3082w as interface chip can effectively shield the above noise and transient, provide sufficient protection for expensive control equipment and reduce the risk of damage. Communication with RS485 equipment at the other end is suitable for long-distance signal transmission. The product has failure protection function. In the receiving state, if the input is open or short circuited, the receiver outputs high level. RS485 is a communication protocol standard, which is used to define the electrical characteristics of drivers and receivers used in serial communication systems. It supports Multipoint Systems and is widely used in industrial fields. When the project equipment needs communication control through RS485 and has high requirements for signal-to-noise ratio and transmission distance, it is a good choice to use iso485 unit for interface type transfer.
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## Product Features
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- Built in ca-is3082w isolation chip
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- Isolated DC-DC
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- Signal transmission rate: up to 10 Mbps
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- Fail safe receiver (bus open, short circuit)
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- Supports up to 256 bus nodes
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- Up to 5000 VRMs isolation and withstand voltage
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- Development platform: Arduino, uiflow (blocky, pyhton)
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- 2X LEGO compatible holes
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## Include
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- 1x ISO485 Unit
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- 1x Grove Cable(5cm)
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## Applications
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- Communication between RS485 interface device and microcontroller in industrial equipment
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## Specification
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<table>
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<tr style="font-weight:bold">
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<td>Resources</td>
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<td>Parameter</td>
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</tr>
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<tr>
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<td>Withstand voltage value</td>
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<td>5000V</td>
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</tr>
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<tr>
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<td>Maximum number of nodes</td>
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<td>256个</td>
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</tr>
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<tr>
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<td>ESD</td>
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<td>±15KV</td>
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</tr>
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<tr>
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<td>Protection function</td>
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<td>Failure protection, over-current protection and thermal shutdown protection</td>
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</tr>
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<tr>
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<td>New Weight</td>
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<td>13g</td>
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</tr>
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<tr>
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<td>Gross Weight</td>
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<td>25g</td>
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</tr>
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<tr>
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<td>Product Size</td>
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<td>56mm*24mm*11mm</td>
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</tr>
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<tr>
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<td>Package Size</td>
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<td>70mm*55mm*13mm</td>
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</tr>
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</table>
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## EasyLoader
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>EasyLoader is a concise and fast program writer, which has a built-in case program related to the product. It can be burned to the main control by simple steps to perform a series of function verification. Please install the corresponding driver according to the device type. M5Core host [Please click here to view the CP210X driver installation tutorial](en/arduino/arduino_development), M5StickC/V/T/ATOM series can be used without driver)
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<div class="easyloader-box">
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<div style="background-color:white;">
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<div><img src="https://m5stack.oss-cn-shenzhen.aliyuncs.com/image/easyloader_intro.webp"></div>
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<div class="easyloader-btn">
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<a href="https://m5stack.oss-cn-shenzhen.aliyuncs.com/EasyLoader/Windows/UNIT/For%20M5Core/EasyLoader_ISO485_UNIT_With_M5Core.exe">Windows</a>
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<a href="https://m5stack.oss-cn-shenzhen.aliyuncs.com/EasyLoader/MacOS/UNIT/EasyLoader_ISO485_Unit_For_M5Core_.dmg">MacOS</a>
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</div>
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</div>
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<div>
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<video id="example_video" controls>
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<source src="https://m5stack.oss-cn-shenzhen.aliyuncs.com/video/Product_example_video/Unit/PDM.mp4" type="video/mp4">
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</video>
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<div class="easyloader-mask">
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<a>
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<svg id="play-btn" t="1583228776634" class="icon" viewBox="0 0 1024 1024" version="1.1" xmlns="http://www.w3.org/2000/svg" p-id="4152" width="75" height="75"><path d="M512 0C229.216 0 0 229.216 0 512s229.216 512 512 512 512-229.216 512-512S794.784 0 512 0z m0 928C282.24 928 96 741.76 96 512S282.24 96 512 96s416 186.24 416 416-186.24 416-416 416zM384 288l384 224-384 224z" p-id="4153" fill="#007aff"></path></svg></a>
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<p>Description:</p>
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<p>The A/B/C button sends a message to the ISO485 terminal, and the ISO485 received message will be displayed on the screen</p>
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</div>
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</div>
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</div>
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## Related Link
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- **Datasheet**
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- [ISO485](https://m5stack.oss-cn-shenzhen.aliyuncs.com/resource/docs/datasheet/unit/IS3082W.pdf)
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## Schematic
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<img src="assets/img/product_pics/unit/iso485/iso485_sch.webp" width="40%">
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### Pin Map
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<table>
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<tr><td>M5Core(GROVE C)</td><td>U2RXD(GPIO16)</td><td>U2TXD(GPIO17)</td><td>5V</td><td>GND</td></tr>
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<tr><td>ISO485 Unit</td><td>RS485 RXD</td><td>RS485 TXD</td><td>5V</td><td>GND</td></tr>
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</table>
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## Example
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### 1. Arduino IDE
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To get complete code, please click [here]()
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### 2. UIFlow
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To get UIFlow code, please click [here]()
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<script>
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var purchase_link = 'https://m5stack.com/collections/m5-unit/products/rs485-module';
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anchor_search(purchase_link);
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scrollFunc();
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</script>
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