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The MAX3485 board from above at an angle: a black three-way screw terminal along the back edge, B, GND and A printed over three holes in front of it, the eight-legged chip in the middle with MAX3485 3V3 printed above, boxes printed TR 120R and RE-DE on the right, and six holes along the front edge printed GND, 3V3, TX, RX, RE and DE.
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RS485 Transceiver Board, MAX3485, 3.3 V

Two RS485 boards from one 12-pack: a MAX485 board for 5 V microcontrollers and a MAX3485 board for 3.3 V ones. The six pins, which board goes with your microcontroller, the 120 Ω fitted on every board that only the two end boards should keep, and RE joined to DE so one pin sets the direction.

Transceiver
MAX3485for 3.3 V logic
Fitted
120Ω, keep on end boards only
RE and DE
1pin, joined by a 0 Ω link
Start here · 01 A difference, not a levelOpen the board in 3D

Every hole and every part: the 120 Ω between A and B, the 0 Ω joining RE to DE, and the bias and pull-up resistors around the chip.

Product questions & answers ↓

Same board, other voltage

Both boards are in the same 12-pack and talk on the same bus. Pick the one that runs at your microcontroller's voltage.

See this board MAX485for 5 V logicRS485 Transceiver Board, MAX485, 5 VFitted: 120 Ω, keep on end boards only
You have thisMAX3485for 3.3 V logicRS485 Transceiver Board, MAX3485, 3.3 VFitted: 120 Ω, keep on end boards only
The whole handbook11 articles · 55 minQuick referencePDF · 326 KBDatasheetPDF · analog.comModel (GLB)GLB · 1.8 MBCAD (STEP)ZIP · 1.7 MBDrawing (PDF)PDF · 2.2 MBDrawing (DXF)ZIP · 50 KBPinout and specsThe pin table, and the questions people ask first
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RS485 Transceiver Board, MAX3485, 3.3 V

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RS485 Transceiver Board, MAX3485, 3.3 V
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Point a phone camera at the code and this page opens there. It is the same address as the one printed on your box, so it is also what to show someone you are passing the board to.