Experimental Physics and
Industrial Control System

On Aug 2, 2018, at 5:44 PM, David Vine <[email protected]> wrote:

Hi all,

i'm writing device support for the MeCom protocol for a TEC driver from Meerstetter Engineering.

In order to parse the response correctly I need to calculate a checksum thats not included in the response. This is because the response includes the checksum of the command and not the response.

For example:

Command format:

# address sequence_number command CRC16 terminator

# 01 15AA ?IF 257D \r

Response is:

# address sequence_number CRC16 terminator

# 01 15AA 257D \r

So to parse the response I need to calculate a CRC that's not included in the response. For example:

OUT "#0115AA?IF%<xmodem>\r"

IN "#0115AA%<xmodem>\r" but the CRC is for the OUT not the IN.

Any ideas would be much appreciated.

Thanks,
David