CIMSII-Midas_Ink_Control

Python library for communicating with a Megnajet/Xaar CIMS II/HV/Midas ink system.

This library uses RS422 communication with the CIMS II/Midas ink system.

Dependencies

This program requires the use of pySerial

Usage

1. Create a Midas object

import midas_comms

Midas = midas_comms.Midas()

2. The Midas object opens communications by calling the create_serial_connection(port) function with the port name as an argument. Baud rate, etc. can also be passed as arguments, but are set at a default. This function creates a Midas_Serial object tied to the Midas object.

Midas.create_serial_connection('/dev/ttyUSB0')

# The default settings are used as arguments below
Midas.create_serial_connection('/dev/ttyUSB0', baudrate=115200,
                                 stopbits=serial.STOPBITS_ONE,
                                 parity=serial.PARITY_NONE,
                                 databits=serial.EIGHTBITS, timeout=2):

3. The different parameters of the Midas can be accessed through different sub-classes, as well as some through the main Midas class:

Midas() - general control and information
Midas.Status() - alarms and status bits
Midas.Pressures() - infeed, meniscus  parameters
Midas.Temperatures() - heater parameters
Midas.Pumps() - recirc and meiscus pumps
Midas.Purge() - purge pressures and control

Common Enable Bits Combinations

There are a few common enable bits that will most likely be used in all programs:

Value	Ink Enable Command	Recirc. Command	Fill Pump Command	Description
36922	0	0	0	Off
32896	0	0	1	Off
36933	1	0	0	Off
37001	1	1	0	Turns on the recirculation and enables printing
32897	1	0	1	Fills reservoir - needs 32905 sending first
32905	1	1	1	Fills reservoir when needed, prints

NOTE: There is a quirk with having just the fill pump on, the system must be fully enabled, and then the recirculation and enable printing disabled.

They can be set using:

Midas.set_enable_bits("32905")  # Fully enable the Midas system

This is equivilent to sending SEB,32905\r through the serial port.