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Commit 78958f1c authored by Daniele Nicolodi's avatar Daniele Nicolodi
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pfeifferRS485: Add some documentation

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"""Pfeiffer Vacuum RS485 sniffer.
The RS485 standards allows for multiple devices to be connected to the bus.
All the connected devices receive the data transmitted on the bus. Addressing
is done at the data protocol leve. This tool monitors the communication
between the RS485 bus master (typically an OmniControl device) and the slave
devices (DigiLine vacuum gauges or pumps) and extracts parameters of interest.
The following RS485 components have been tested to work just fine:
- FTDI USB-RS485 Adapter
https://ftdichip.com/product-category/products/cables/usb-rs485-cable-series/
https://de.rs-online.com/web/p/schnittstellenadapter-und-konverter/7300164
- M12 4-pin connector
https://de.rs-online.com/web/p/industrie-automation-steckverbinder/2080565
- M12 Y-splitter
https://de.rs-online.com/web/p/rundsteckverbinder-adapter/9132389
M12 cable pins assignment:
1. RS485 D+ : connect to FTDI USB-RS485 "orange" wire
2. 24V-DC power supply : make sure to do NOT connect
3. GND
4. RS485 D- : connect to FTDI USB-RS485 "yellow" wire
"""
import click
import dataclasses
import enum
......
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