Example with V.10 at Raspberry Pi

Hardware

All you need is a Raspberry Pi, a TTL-IC as driver and a hand full of resistors.

Schematics

It is important to use a 74HCT00 and not a 74HC00. The chip must be powered by 5V. The HCT-family has an input threshold compatible with TTL-3.3V-level.

For more electronic details see Electronic for V.10.

---

Software

For piTelex installation see SW_Install

This adapter is handled by the software module RPiTTY.

The settings in the file telex.json have to be adapted:

...
   "RPiTTY": {
      "type": "RPiTTY",
      "enable": true,
      "mode": "V10",
      "pin_txd": 17,
      "pin_rxd": 27,
      "inv_rxd": false,
      "pin_relay": 22,
      "inv_relay": false,
      "use_observe_line": true,
      "pin_observe_line": 10,
      "inv_observe_line": true,
      "baudrate": 100,
      "coding": 0,
      "loopback": false
    },
...

Note: To use the i-Telex communication module, enable and configure the i-Telex section in telex.json.

Start the program telex.py with no arguments on RPi-Linux:

./telex.py