Campbell Scientific SM192/SM716 Storage Modules - Manual (Page 7)

SECTION 1. SM192/716 STORAGE MODULE OVERVIEW
1-3
Expected
Battery Life
SM192 SM716
@ 25C about 10 yrs. about 6 yrs.
@ 50C about 3 yrs. about 2 yrs.
@ -25C about 6 yrs. about 4 yrs.
NOTE: These figures apply when:
1. The SM is not connected to a primary
power supply (such as a datalogger), and
2. The SM is continuously at one of the
above temperatures.
Meeting these conditions is unlikely in
normal operation.
1.4 FUNCTION
The SM192 and SM716 Storage Modules
provide battery-backed, solid-state, RAM data
storage to supplement the storage capacity in a
datalogger. The Storage Modules can store
data from all Campbell Scientific, Inc.
dataloggers and from other devices which
properly enable them.
All Storage Module operations occur in one of
three basic operational modes:
1. Interactive communication with
datalogger for data and program
storage and retrieval.
2. The Printer Enable Method for data
storage with the 21X and CR7 with
older PROMS, the CR21, the DSP4,
and non-datalogger devices.
3. The Telecommunications Command
State for data retrieval and other
miscellaneous operations.
1.4.1 OPERATION WITH CURRENT CR10, 21X,
AND CR7
Storage Module operations with the current
versions of the CR10, 21X, and CR7 are
accomplished through the use of an interactive
command structure with handshaking (Figure
1.4-1). If the SM is not connected, the
datalogger will not send data. The datalogger
detects when the SM is connected, and sends
the backlogged data the next time it executes
Instruction 96.
The SM can store data either under program
control (Instruction 96) or under user control (*8
Mode with CR10, *9 Mode with 21X and CR7).
Datalogger programs can be stored in and
retrieved from the Storage Module using the *D
Mode. The CR10 *9 Mode enables the user to
directly execute commands such as: check
battery, change address, view data, etc.
(Appendix A).
1.4.2 OPERATION WITH DATALOGGERS WITH
OLDER PROMS AND NON-DATALOGGER
DEVICES (PRINTER ENABLE METHOD)
In the Printer Enable Method (Figure 1.4-2), the
Storage Module stores all data received (on pin
9) while the printer enable line (pin 6) is high.
The Storage Module baud rate must be set to
match that of the sending device (Section
1.4.5). The datalogger cannot detect if the SM
is connected. Data are sent whether or not the
SM is connected.
Data can be stored in the SM under program
control (Instruction 96 or *4) or under user
control (*9 Mode). Operations with the CR21,
the DSP4 Heads Up Display and with non-
datalogger devices (Appendix C) are also
accomplished through the Printer Enable
Method (Section 3).
1.4.3 DATA RETRIEVAL/TELECOMMUNICATION
COMMAND STATE
Data retrieval and other interactive operations
with a computer take place in the
Telecommunications command state (Figure
1.4-3). TELCOM (PC208 software) uses the
Telecommunications Commands for data
retrieval, data storage, storage and retrieval of
datalogger programs, SM software switch
setting, status checks, battery tests and other
functions (Section 5). The commands used by
TELCOM are described in Appendix D.