Campbell Scientific SM4M/SM16M Storage Modules - Manual (Page 11)

Section 1. SM4M/SM16M Storage Module Overview
1-5
Emulator mode. A list of direct telecommunication commands is shown in
Appendix B.
Computer/
Terminal
SM4M/
16M
FIGURE 1-4. Telecommunications Command State
1.4.4 Memory Configuration
The Storage Module’s memory can be configured as either Fill and Stop or
Ring memory. In the Fill and Stop configuration, the Storage Module stops
accepting data when its memory is full. No data write-over occurs with this
configuration. In the Ring Memory configuration (the default setting), new
data continues to be stored even after the memory is full. Once full, new data
is written over the oldest data. The Storage Module’s memory configuration
can be changed using SMS or with command 4 of the CR500/510, CR10/10X,
CR23X *9 Mode.
1.4.5 Baud Rates
The Storage Module automatically detects the baud rate of data sent to it.
When using the telecommunications commands, sending several carriage
returns will cause the Storage Module to match the computer’s baud rate (see
specifications above).
1.4.6 File Marks
File Marks are used to separate data in the Storage Module. A File Mark is
automatically placed in the Storage Module’s memory when the Storage
Module is connected to a power source (datalogger or retrieval interface), or
when the datalogger compiles a program containing Instruction 96. For
example, if the user has retrieved data from one datalogger, disconnects the
Storage Module and then connects it to a second datalogger, a File Mark is
placed in the data when the second datalogger is connected. This mark follows
the data from the first datalogger and precedes the data from the second. A
File Mark can also be inserted under program control.
The Storage Module must be disconnected from power for
10 seconds or more to be certain it places a File Mark in
the Storage Module when reconnected.
A File Mark can be placed in the data by using SMS or the
CR500/510/10/10X/23X *9 Mode command 3. The Storage Module will not
CAUTION