rs-232 pal demos

CircuitPython and Arduino RS-232 Pal demos. uses serial console to send commands

RS-232_Pal_Demos/Arduino_RS-232_Pal/Arduino_RS-232_Pal.ino

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+// SPDX-FileCopyrightText: 2024 Liz Clark for Adafruit Industries
+//
+// SPDX-License-Identifier: MIT
+
+#include <SoftwareSerial.h>
+
+// update this for your RS-232 device baud rate
+#define baud 38400
+// define RX and TX pins for the software serial port
+#define RS232_RX_PIN 2
+#define RS232_TX_PIN 3
+
+SoftwareSerial rs232Serial(RS232_RX_PIN, RS232_TX_PIN);
+
+void setup() {
+  Serial.begin(115200);
+  while ( !Serial ) delay(10);
+
+  rs232Serial.begin(baud);
+
+  Serial.println("Enter commands to send to the RS-232 device.");
+  Serial.println();
+}
+
+void loop() {
+
+  if (Serial.available() > 0) {
+    String userInput = Serial.readStringUntil('\n');
+    userInput.trim();  // remove any trailing newlines or spaces
+    if (userInput.length() > 0) {
+      // send the command with a telnet newline (CR + LF)
+      rs232Serial.print(userInput + "\r\n");
+      Serial.print("Sent: ");
+      Serial.println(userInput);
+    }
+  }
+
+  // check for incoming data from RS-232 device
+  while (rs232Serial.available() > 0) {
+    char response = rs232Serial.read();
+    // print the incoming data
+    Serial.print(response);
+  }
+
+  delay(50);
+}

RS-232_Pal_Demos/CircuitPython/code.py

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+# SPDX-FileCopyrightText: 2024 Liz Clark for Adafruit Industries
+# SPDX-License-Identifier: MIT
+
+import time
+import board
+import busio
+
+# baud rate for your device
+baud = 38400
+uart = busio.UART(board.TX, board.RX, baudrate=baud)
+
+print("Enter commands to send to the RS-232 device. Press Ctrl+C to exit.")
+while True:
+    user_input = input("Please enter your command: ").strip()
+    if user_input:
+        # send the command with a telnet newline (CR + LF)
+        uart.write((user_input + "\r\n").encode('ascii'))
+
+    # empty buffer to collect the incoming data
+    response_buffer = bytearray()
+
+    # check for data
+    time.sleep(1)
+    while uart.in_waiting:
+        data = uart.read(uart.in_waiting)
+        if data:
+            response_buffer.extend(data)
+
+    # decode and print
+    if response_buffer:
+        print(response_buffer.decode('ascii'), end='')
+        print()