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.
Board logic supply input. Adafruit Learn says to power it with the same voltage as the logic level of the microcontroller.
Common ground for power and logic.
Positive voltage rail output from the RS-232 connection, usable as a reference voltage.
Negative voltage rail output from the RS-232 connection, usable as a reference voltage.
Low-voltage side channel 1 logic data input from UART.
Low-voltage side channel 1 logic data output to UART.
Low-voltage side channel 2 logic data input from UART.
Low-voltage side channel 2 logic data output to UART.
High-voltage RS-232 side channel 1 line data output to the remote RS-232 system.
High-voltage RS-232 side channel 1 line data input from the remote RS-232 system.
High-voltage RS-232 side channel 2 line data output to the remote RS-232 system.
High-voltage RS-232 side channel 2 line data input from the remote RS-232 system.
| Pin | Position | Type | Function | Voltage |
|---|---|---|---|---|
| VIN | power | Board logic supply input. Adafruit Learn says to power it with the same voltage as the logic level of the microcontroller. | 3.3V or 5V logic supply, matching the microcontroller logic level | |
| GND | ground | Common ground for power and logic. | 0V reference | |
| V+ | power | Positive voltage rail output from the RS-232 connection, usable as a reference voltage. | RS-232 generated positive rail reference | |
| V- | power | Negative voltage rail output from the RS-232 connection, usable as a reference voltage. | RS-232 generated negative rail reference | |
| LV T1 | signal | Low-voltage side channel 1 logic data input from UART. | 3.3V or 5V logic | |
| LV R1 | signal | Low-voltage side channel 1 logic data output to UART. | 3.3V or 5V logic | |
| LV T2 | signal | Low-voltage side channel 2 logic data input from UART. | 3.3V or 5V logic | |
| LV R2 | signal | Low-voltage side channel 2 logic data output to UART. | 3.3V or 5V logic | |
| HV T1 | signal | High-voltage RS-232 side channel 1 line data output to the remote RS-232 system. | RS-232 signalling, Adafruit notes this side can require about ±6V to ±10V | |
| HV R1 | signal | High-voltage RS-232 side channel 1 line data input from the remote RS-232 system. | RS-232 signalling, Adafruit notes this side can require about ±6V to ±10V | |
| HV T2 | signal | High-voltage RS-232 side channel 2 line data output to the remote RS-232 system. | RS-232 signalling, Adafruit notes this side can require about ±6V to ±10V | |
| HV R2 | signal | High-voltage RS-232 side channel 2 line data input from the remote RS-232 system. | RS-232 signalling, Adafruit notes this side can require about ±6V to ±10V |
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.
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