Campbell Hausfeld SM4M - Manual (Page 9)

Section 1. SM4M/SM16M Storage Module Overview
1-3
memory in an SM4M and 256 blocks in an SM16M. This equates to a capacity of
more than 2 million low-resolution storage values for the SM4M and more than 8
million low-resolution values for the SM16M – See Section 4.
1.3 Power
1.3.1 Primary Power
The Storage Module is powered by 5V DC received from the datalogger or from
data retrieval interfaces such as the SC532 9-pin Peripheral to RS232 Interface.
Pin 1 of the 9-pin D-connector supplies the 5V DC. Pin 2 is both the power
ground and signal ground.
1.3.2 Backup Power and Data Retention
The modules use non-volatile flash EEPROM memory, which does not require
power to retain data. There is no internal battery.
The flash memory will retain stored data for approximately 10 years. Typically,
the flash memory can be erased and rewritten a minimum of 100,000 times.
1.4 Function
The SM4M and SM16M Storage Modules supplement the storage capacity in a
datalogger. The Storage Modules can store data from Campbell Scientific
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 the datalogger for data and program storage
and retrieval.
2. The Printer-Enable Method for data storage with the 21X and CR7 which
have older operating systems, and also with the DSP4.
3. The Telecommunications Command State for data retrieval and other
miscellaneous operations.
1.4.1 Operation with Current Dataloggers
The Storage Module uses an interactive command structure with handshaking
when connected to the CR500/510, the CR10/10X, CR23X, or to the 21X or CR7
fitted with recent software (see Figure 1-2). If the SM is not connected the
datalogger does not send data. The datalogger detects when the SM is connected
and sends the backlogged data the next time it executes Instruction 96.
Datalogger
SM4M/
16M
STORE DATA W/ INSTRUCTION 96
STORE DATA W/ *8 MODE CR500/CR510/CR10/CR10X/CR23X
STORE DATA W/ *9 MODE 21X, CR7
UPLOAD AND DOWNLOAD PROGRAMS W/ *D MODE
*9 MODE COMMANDS CR500/CR510/CR10/CR10X/CR23X
Figure 1-2 Operation with Current Dataloggers