Are there any instructions on how to use it? Send or receive Messages?

This is a "well behaved" product which seems to meet its specifications. I recommend this product for what it does. It works well for both send and receive. I have several of them. Serial communications can be a bit "tricky" so if you are not familiar with it, I recommend either a book or research on the internet. A full discussion of this subject is a bit beyond this forum. Good luck.

Would it work with rs422?

Currently, only RS485 is supported.

this item include the cables on the picture?

I don't know what picture you are looking at but - probably. The package included a 4 conductor cable approximately 12 inches long. It is designed to plug into the "TTL" end.

Does the tx go into high-z (tri-state) when not transmitting, so it can be used on modbus or multi-drop lines?

Yes. It works well with Modbus multi-drop lines as long as your "master" is working according to spec. For the price, just try it to be sure it works for you.

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DSD TECH SH-U12 RS485 to TTL 5V Board with MAX13487 Chip for Raspberry Pi Arduino and Other MCU

Product ID: 79347136

⚡15KV ESD & TVS surge protection

🔗Supports 128 slave devices on RS485 network

🚀Up to 500 Kbps transmission speed

AR$70967

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Description

🔗 Connect smarter, faster, and safer with DSD TECH’s RS485 to TTL board!

BUILT TO LAST - Robust 15KV ESD and TVS surge protection shields your projects from electrical hazards
NETWORK LIKE A PRO - Supports up to 128 slave devices, perfect for complex IoT and automation setups
ROCK SOLID STABILITY - Powered by MAX13487 chip for reliable, industrial-grade performance
PLUG PLAY VERSATILITY - Effortlessly integrates with Raspberry Pi, Arduino, robots, and other MCUs
LIGHTNING FAST DATA FLOW - Achieve blazing 500 Kbps transmission rates for seamless multi-device communication

The DSD TECH SH-U12 RS485 to TTL 5V board features the MAX13487 chip, delivering stable and high-speed data transmission up to 500 Kbps. Designed for Raspberry Pi, Arduino, and other MCUs, it supports communication with up to 128 slave devices. Enhanced with 15KV ESD and TVS surge protection, it ensures durability and reliability in demanding environments.

Specifications

ASIN	B07B667STP
Best Sellers Rank	35,747 in Computers & Accessories ( See Top 100 in Computers & Accessories ) 204 in Motherboards
Guaranteed software updates until	unknown
Item model number	SH-U12
Manufacturer	DSD TECH
Product Dimensions	5.08 x 1.78 x 1.78 cm; 15 g

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AR$70967

Duties & taxes included

In stock

Sold byAmazon ArgentinaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Argentina.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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The MOLLE sheath is of exceptional quality. Very happy with my purchase.

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