# Long Data Wire + ESP8266 + Level Shifter

**URL:** <https://wled.discourse.group/t/long-data-wire-esp8266-level-shifter/3742>\
**Category:** Questions\
**Created:** [October 12, 2021, 5:51pm UTC](https://wled.discourse.group/t/long-data-wire-esp8266-level-shifter/3742 "2021-10-12T17:51:03Z")\
**Posts on this page:** 1\
**Showing post:** 11

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**Author:** ![homeseer666](https://yyz2.discourse-cdn.com/free1/user_avatar/wled.discourse.group/homeseer666/32/2099_2.png) [@homeseer666](https://wled.discourse.group/u/homeseer666)\
**Post date:** [November 22, 2021, 4:58am UTC](https://wled.discourse.group/t/long-data-wire-esp8266-level-shifter/3742/11 "2021-11-22T04:58:14Z")

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Hi @divsys, can you confirm if my wiring below for the Max485 is right ?  
Not too sure about the RO-RE-DE-DI part but gave it a shot based on this

RO - Receiver out  
RE - Receiver enable (enabled when this pin is LOW)  
DE - Driver enable (enabled when this pin is HIGH)  
DI - Driver in (the transmitter pin)

I guess I could also use 12v-5v step down converters to feed the transmitter/receiver and go from 5 wires to 4 wires  
As per your other thread

> [@Personal project for my backyard... which way to choose?](https://wled.discourse.group/t/personal-project-for-my-backyard-which-way-to-choose/3057/7):
>
> In a nutshell - a MAX485 IC configured as a Transmitter (Tx) takes a standard digital 5V input (but works reasonably well with 3.3v) and transforms that to a “differential signal” across two wires A&B. You hook those two wires (I add ground as well) to a Receiver (Rx) at some distance (10m-750m) away and the differential is converted back to digital 5V output. The units are small and consume very little power, the majority is the bus termination resistors that consume about 85ma. So your diag…

Also, what are the terminals blocks for? just another way to wire A-B ?

 ![image](https://global.discourse-cdn.com/free1/uploads/wled/original/2X/3/3d55d664fe8ee547a0ead702f58c3f08950c0c7d.jpeg)  
.

Let me know what needs to be corrected, unless I’m right =)  
Thanks.

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