Adafruit RS232 Pal - Two Channel UART to RS-232 Level Shifters
MAX3232E-based breakout providing two full-duplex RS-232 channels with onboard charge-pump voltage generation for ±9 V RS-232 levels. Supports data rates up to 250 kbps; suits telco, retro, and industrial RS-232 equipment.
Pinout
- VIN
Board logic supply input. Adafruit Learn says to power it with the same voltage as the logic level of the microcontroller.
Type · powerVoltage · 3.3V or 5V logic supply, matching the microcontroller logic level - GND
Common ground for power and logic.
Type · groundVoltage · 0V reference - V+
Positive voltage rail output from the RS-232 connection, usable as a reference voltage.
Type · powerVoltage · RS-232 generated positive rail reference - V-
Negative voltage rail output from the RS-232 connection, usable as a reference voltage.
Type · powerVoltage · RS-232 generated negative rail reference - LV T1
Low-voltage side channel 1 logic data input from UART.
Type · signalVoltage · 3.3V or 5V logic
Start wiring
Ethernet · UART · SPI · Shield
Verify supply voltage and logic levels before powering up.
Module pins: VIN, V+, V-, GND, LV T1, LV R1, LV T2, LV R2. Schematik maps them to your board in the app.
Wired comms
115 other optionsW5100/W5500 Ethernet shields, LAN8720 RMII PHY boards, MAX3243 RS-232 level shifters, isolated USB-to-RS485 converters, CAN FD bridges, and passive or active PoE injectors and splitters.
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