ok think I have found what I'm looking for.

PMS Parameters (USED IN RATE TABLE 1 ONLY)
Code
Location----Typical Value-----Description
066  -------- 0.02 ------------ Start-of-Text character for PMS record 0.02 = use ASCII value 002 = STX
067 --------- 0.03 ------------ End-of-Text character for PMS record 0.03 = use ASCII value 003 = ETX
I'l try to hyperterminal in and see what I get.