# README

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The `delimux` module provides a streamlined communication with a socket server running on the delimux Raspberry Pi. On the delimux Raspberry Pi, a [MUX36S08](https://www.ti.com/lit/gpn/mux36s08) analog multiplexer is connected via a custom designed hat. It allows the user to route an incoming electrical signal in the range between 0V and 40V onto one of seven lines in a patch cable. The raw [communication protocol](#raw-protocol) is shown below. The `delimux` module wraps this into a set of convenience functions and in particular allows the user to select the channel by patch cable number or by [mux](https://www.ti.com/lit/gpn/mux36s08) channel. 

## Installation

`pip install delimux`

## How to use

The usage should be self-explanatory:
```python
import delimux
mx=delimux.DeliMUX()
help(mx)
class DeliMUX(builtins.object)
 |  DeliMUX(host='delimux-cmtqo', port=60606, verbose=False)
 |  
 |  Client for controlling a MUX36S08 device via socket protocol.
 |  
 |  Server is expected to run on delimux-cmtqo:60606
 |  and respond to newline-terminated commands like SET, GET, ENABLE, etc.
 |  
 |  Methods defined here:
 |  
 |  __init__(self, host='delimux-cmtqo', port=60606, verbose=False)
 |      Initialize self.  See help(type(self)) for accurate signature.
 |  
 |  disable(self)
 |  
 |  enable(self)
 |  
 |  getChannel(self) -> int
 |  
 |  getLine(self) -> int
 |  
 |  getState(self) -> list
 |  
 |  setChannel(self, n: int)
 |      Sets the channel 
 |      
 |      Channel refers to the channel of the MUX36S08
 |  
 |  setLine(self, n: int)
 |      Sets the line 
 |      
 |      Line refers to the patch-cable line, line 8 is GND
 |  
```

## Raw protocol

Via a direct socket connection the full protocol can be exploited:

Commands are terminated with `\r\n` or `\n`.


| Command     | Description                                       | Response Format             |
| ----------- | ------------------------------------------------- | --------------------------- |
| `SET <n>`   | Sets the MUX channel to `n` (0–7) and enables it  | `OK` or `ERROR <message>`   |
| `GET`       | Returns full state as 3 address bits + enable bit | `STATE <A2> <A1> <A0> <EN>` |
| `CHANNEL`   | Returns the currently selected channel number     | `CHANNEL <n>`               |
| `ENABLE`    | Enables the MUX                                   | `OK`                        |
| `DISABLE`   | Disables the MUX                                  | `OK`                        |
| *(unknown)* | Any invalid or unsupported command                | `ERROR Unknown command`     |

---

## Hardware 

<img src="board.jpg" width="500">

## Signal quality

The device was tested with a Picoscope 4824A. The input signal was generated with the AWG generating a square wave. The distortion of the input signal is due to the output limitations of the picoscope. 

Characteristic response at 1 kHz:

<img src="001kHz.png" width=500>

The inset shows the rise time of the MUX. 

At 200 kHz we get the following plot:

<img src="200kHz.png" width=500>



