Ejemplo de MAX485 sin Microcontrolador
0:00
Work done
- Updated project description to include USB–RS-485 (RTS controlled) block
- Added U5 as the MAX485 transceiver
Tasks not yet done
- Add termination resistor: 120 Ω Resistor
- Add two bias resistors: 680 Ω Resistor ×2
- Add TVS protection: Bidirectional TVS Diode
- Wire IC1 TXD→MAX485 DI, RO→IC1 RXD, tie RTS→DE/RE
- Expose bus via new portals: RS485_A, RS485_B
- Connect MAX485 VCC and GND to +5 V and GND
- Label block “USB–RS-485 (RTS controlled)”
- Run ERC/DRC checks
Cannot do
- Adding a MAX3485 transceiver (step 2.1 requires MCU support)
Success criteria
- Partially met: MAX485 block added. Remaining success criteria (resistors, termination, diode, wiring, portals, power, checks) still to implement.
Next step
Add the supporting components (#3): place and configure the 120 Ω termination resistor, two 680 Ω bias resistors, and the TVS diode across A/B.
181 days
I want to add two resistors to RS485_A and RS485_B. First one is the RS485_A 1k ohm up to 3V3. And other to RS485_B 1k ohm down to GND.
19 days
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