This excel file is meant to Decode/Encode messages from/to the Thomson Electrak® HD Electric Linear Actuator Series.
This actuator uses J1939 communication protocol to control and monitor Position, current, speed, among other attributes.
The Actuator Control message is sent over the proprietary A message (PGN 61184) and received over proprietary A2 message (PGN 126720).
Manual: https://www.thomsonlinear.com/downloads/actuators/Electrak_HD_Installation_Operation_mnen.pdf