Campbell Hausfeld SM4M - Manual (Page 25)

5-1
Section 5. Data Retrieval
Data retrieval is accomplished on PCs using SMS (part of the PC208W datalogger support
software package). Other computers require a software program which makes use of the
Storage Module telecommunications commands (see Appendix B). This process requires both
a hardware interface and a software program.
5.1 Hardware
There are two interfaces which enable communication between a computer and
the Storage Module:
1.
the SC532 Peripheral to RS232 Interface
2. the CR500/510, CR10/10X or CR23X with a suitable cable and interface
(not possible with other dataloggers)
The SC532 can function with any computer that has an RS232 port. A software
program is required to raise the DTR and RTS (pins 20 and 4, respectively) to
activate the SM (see Section 5.2). SMS performs this function automatically.
Logan, UT
SM4M
SN:
SOLID STATE STORAGE MODULE
MADE IN USA
SC532
9 PIN PERIPHERAL TO RS232 INTERFACE
MADE IN USA
PERIPHERAL RS232
9227
Figure 5-1 Storage Module Connected to a Portable PC via an SC532 Interface
5.1.1 SC532 Interface
A standard 25-pin ribbon cable (e.g. Campbell Scientific SC25AT) links the
SC532 to the computer’s serial port. The SC12 9-pin ribbon cable links the
Storage Module to the SC532 (see Figure 5-1).
The SC532 requires 12V DC (nominal) which is usually provided by plugging the
AC/DC adaptor unit into a standard AC outlet. The use of battery power is
possible and is described in the SC532 manual.
5.1.2 Via Datalogger
The Storage Module is linked to the CR500/510, CR10/10X or CR23X by the
SC12 cable. The computer connection is via an SC32A (see Figure 5-2), SC929 or
SC532/RAD modem interface. With this configuration on the CR23X connect all
devices to the 9 pin CS I/O port. Select the ‘Via Datalogger’ option in SMS and
select the appropriate datalogger and baud rate.
Please note that communication in this mode is limited to a maximum speed of
9600 baud (19200 on the CR23X), which can make the transfer of large volumes
External Power from AC/DC Power
Adapter or 12V DC supply