5-1
SECTION 5. DATA RETRIEVAL
Data retrieval is accomplished on PCs using SMCOM. Other computers require a software program
which makes use of the Storage Module Telecommunications Commands (Appendix D). This process
requires both a hardware interface and a software program.
5.1 HARDWARE
There are four interfaces which enable
communication between a computer and the
Storage Module:
1.
The SC532 Peripheral to RS232 Interface
2.
The PC201 Tape Read, Clock, Serial I/O
Card (requires SC209 cable)
3.
The CR10 (not possible with other
dataloggers)
4.
The SM232A Storage Module RS232
Interface
The PC201 Card functions
ONLY
with IBM
PC/XT/AT's and compatibles. The SC532 can
function with any computer having an RS232
port BUT both the PC201 and the SC532
require a software program to raise the CLK/HS
and PE lines (by raising pins 20 and 4,
respectively, on the computer) in order to
activate the SM (Section 5.2). SMCOM
program performs this function automatically.
The SM232A functions with any RS232
computer or terminal which raises the DTR line
when powered up.
5.1.1 SC532
A standard 25-pin ribbon cable links the SC532
to the computer's 25-pin serial port. If the
computer has a 9-pin serial port, a 9-pin to 25-
pin adaptor cable is required. Campbell
Scientific Inc.'s SC12 9-pin ribbon cable links the
Storage Module to the SC532 (Figure 5.1-1).
The SC532 requires 12 VDC (nominal) which is
usually furnished by plugging the AC/DC adaptor
unit into a standard 120 VAC outlet. The use of
battery power is possible and is described in the
SC532 manual.
5.1.2 SC209/PC201
The SC209 - Storage Module connector cable
(available from Campbell Scientific Inc.) links
the 9-pin port on the Storage Module to the 34
pin connector on the PC201 card (Figure 5.1-2).
5.1.3 VIA CR10
The Storage Module is linked to the CR10 by
the SC12 cable. SCOM establishes
communication between the computer and the
CR10 over direct cable or telecommunication
link (Figure 5.1-3).
5.1.4 SM232A
The AC adaptor is plugged into a 120 VAC
outlet. The serial port of the terminal/computer
is connected to the "TO TERMINAL" connector
on the SM232A with a 25-pin cable. An SC12
9-pin ribbon cable, links the Storage Module to
the "TO STORAGE MODULE" connector on the
SM232A. The central toggle switch is placed in
the "DATA TO TERMINAL AND MODEM"
position; the other toggle switch in the
"TRANSPARENT" position. (Figure 5.1-4).
5.2 SOFTWARE
SMCOM (PC208 Software) is used with IBM
PC/XT/AT/PS-2 or compatibles. It functions
with any of the hardware interfaces listed in
Section 5.1. SMCOM automates the storage
and retrieval of data and programs and also has
a terminal emulator for the manual execution of
telecommunications commands.
