---
title: How long is the max. active distance between the tag and the R/W head?
description: The active distance between the tag and R/W head
---

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# How long is the max. active distance between the tag and the R/W head?

## The active distance between the tag and R/W head

The common read-write head of bisv processor cannot meet the read-write distance of more than 100 mm.

 

![图片1](https://kb.innovatingautomation.asia/hs-fs/hubfs/Knowledge%20Base/Simplified%20Chinese/Image/RFID1_1/3/%E5%9B%BE%E7%89%871.png?width=300&name=%E5%9B%BE%E7%89%871.png)

This requires us to use a special adapter to connect the super long distance read-write head to read.

Here, we use the BIS vm-920 adapter  + M series read-write head.

 

![图片2](https://kb.innovatingautomation.asia/hs-fs/hubfs/Knowledge%20Base/Simplified%20Chinese/Image/RFID1_1/3/%E5%9B%BE%E7%89%872.png?width=223&name=%E5%9B%BE%E7%89%872.png)![图片3](https://kb.innovatingautomation.asia/hs-fs/hubfs/Knowledge%20Base/Simplified%20Chinese/Image/RFID1_1/3/%E5%9B%BE%E7%89%873.png?width=600&name=%E5%9B%BE%E7%89%873.png)

The combination of bis vm-920 adapter + M series read-write head can achieve a maximum distance of 400mm.

 

![图片4](https://kb.innovatingautomation.asia/hs-fs/hubfs/Knowledge%20Base/Simplified%20Chinese/Image/RFID1_1/3/%E5%9B%BE%E7%89%874.png?width=485&name=%E5%9B%BE%E7%89%874.png)

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