Campbell Scientific SM4M/SM16M Storage Modules - Manual (Page 21)

Section 3. The Printer Enable Method of Data Storage
3-3
1. Data is stored in datalogger Input Storage locations
or
2. Raw data is sent out the datalogger serial port. In the second case, the
Storage Module can capture data at 76,800 baud.
When the Burst Measurement (Instruction 23) is used with the 21X, select the
destination (parameter 4) option as 2 for serial port output at 76,800 baud to
send data to the Storage Module. Burst data is output by the datalogger in a
unique format which includes calibration measurements at the beginning and
end of the series of measurements. Split (part of PC208/PC208W) will
translate Burst data.