I-Mark can monitor the Serial Data register. 

Depending on which version of I-Mark you are using, we give you the ability to change the data characters in the software so you can specify yourself which one I-Mark should be looking for in the serial string. 

However, if you are not using I-Mark v 1.2.1.7 or Greater than the default setting for this would be as listed below.

Serial Communication Settings

Baud Rate: 9600

Data Bits: 8

Parity: None

Stop Bits: 1

Flow Control: None

By default, the terminating character for the starts of a data string is the Colon “:” then any data following that (Up to 80 characters) is what will be marked in the placeholder 0 (%p0 in I-Mark). 

Then to terminate the string I-Mark will look for CR (Carraige Return [Dec 13 or Hex D]) and LF (Line feed [Dec 10 or Hex A]).

When you have the string formatted correctly then you should be able to send it to the I-Mark 1 time any as long as it is powered up and it will retain that string and continue to mark it when called until you send it new data which will overwrite it. 

Created with the Personal Edition of HelpNDoc: Don't be left in the past: convert your WinHelp HLP help files to CHM with HelpNDoc