CCD Cold Head Temperature Controllers

Green CCD Cold Head
Temperature Controller

1

Instec

mK2000B

Red CCD Cold Head
Temperature Controller

1

Instec

mK2000B

Green LN2 Pump

1

Instec

LN2-SYS

Red LN2 Pump

1

Instec

LN2-SYS

mK2000 User Manual

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mK2000 Command Reference

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LN2-SYS Pump Manual

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Instec said: “While we do have sample code for Python, it is based on a USB connection, not Ethernet. 

Our documentation on Ethernet programming is limited because it isn’t very frequently used for custom applications.

This ZIP file contains example code for python using a USB connection. It could serve as the basis for an ethernet version.”

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Ethernet communication setup from Instec.

Mainly describes how to write code to find Instec devices on a network.

Note PacketSender image within, which shows correct port to use for ethernet communication.

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PacketSender connection example

Screengrab of SG’s successful connection to device through PacketSender. Note port is 50292.

Instec App for Windows
(standalone program; not useful for KTL but included here for completeness)

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Steve’s python code that uploads a PID table from a .csv file (in Instec format) to the device over USB.

Example PID tables also included (one with actual values, and one with integers that was useful for testing code).

Code:

PID files:

Steve’s test of parsing and uploading Instec .csv file

Calibration table decoder ring
(output of CAL:TAB command)

The data is formatted as follows:

The return data is 171 bytes long.

The first byte is “#”, while the last two bytes are the “return” (0x0D) and “New line” (0x0A) characters.

The 6^th byte describes the data type; 0 = TM, 1 = Calibration Table C1, 4 = Calibration Table C4 etc…

The 7^th byte is the number of entries in the calibration table.

The actual calibration data begins at the 10^th byte. For each in the calibration table, there are two floating point numbers which correspond to T0 and Ts.

Each floating point number consists of 4 bytes, which are arranged in little endian order.

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Controller calibration file example.

Filename structure is:

“cold_head_SN & mK2000B_SN cal.clb”

dispnum

1

Dispatcher number

address

192.168.23.145

IP address of the Instec

port

50292

Port number of the Instec

model

MK2000B

model of the Instec, used to find the serial number

poll_time

10

how often in seconds the various values are queried

calfile

@RELDIR@/data/@KTLSERVICE@/KCPE2006054_KSE48Sm22001147_cal.clb

calibration file for the controller, on connection the table is read in and then compared with the values in the Instec controller