Campbell CR23X, Operator'S Manual

Page: 69 / 374

SECTION 4. EXTERNAL STORAGE PERIPHERALS
4-5
4.4.1 STORAGE MODULE ADDRESSING
The CSM1 does not support individual addresses.
Use address "1" when sending data to the CSM1.
The SM192/716 Storage Modules can have
individual addresses. Different addresses allow 1)
up to 8 Storage Modules to be connected to the
CR23X during on-line output, 2) different data to be
output to different Modules, and 3) transfer of data
from a Module that is left with the CR23X to a
Module that is hand carried to the site for data
transfer (
9 Mode).
Storage Modules are assigned addresses (1-8) either
through the
9 Mode or with the PC208W
software. The default address when the Storage
Module is reset is "1". Unless you are using one of the
features which require different addresses, you need
not assign any other address.
Address 1 is also a universal address when
sending data or commands to a storage module
with Instruction 96,
8 , or 9 . When
address 1 is entered in the 9 Mode
(default) or in the device code (71, Table 4.2-1)
for Instruction 96 or the
8 Mode, The
CR23X searches for the Storage Module with
the lowest address that is not full (fill and stop
configuration only) and addresses it. In other
words, if a single Storage Module is connected,
and it is not full, address 1 will address that
Storage Module regardless of the address that
is assigned to the Module.
Address 1 would be used with Instruction 96 if
several Storage Modules with different
addresses were connected to the CR23X and
were to be filled sequentially. The Storage
modules would be configured as fill and stop.
When the lowest addressed Module was full
data would be written to the next lowest
addressed Module, etc.
4.4.2 STORAGE MODULE USE WITH
INSTRUCTION 96
When output to the Storage Module is enabled
with Instruction 96, the Storage Module(s) may
be either left with the CR23X for on-line data
transfer and periodically exchanged, or brought
to the site for data transfer.
USE OF STORAGE MODULE TO PICK UP
DATA
The CR23X is capable of recognizing whether or
not the Storage Module is connected. Each time
Instruction 96 is executed and there is data to
output, the CR23X checks for the presence of a
Storage Module. If one is not present, the
CR23X does not attempt to output data.
Instead, the CR23X saves the data and
continues its other operations without advancing
the Storage Module Pointer (SPTR, Section 2.1).
When the user finally does connect the Storage
Module to the CR23X, two things happen:
1. Immediately upon connection, a File Mark is
placed in the Storage Module Memory
following the last data stored (if a File Mark
wasn't the last data point already in storage).
2. During the next execution of Instruction 96,
the CR23X recognizes that the Storage
Module (SM) is present and outputs all data
between the SPTR and the DSP location.
The File Mark allows the operator to distinguish
blocks of data from different dataloggers or
from different visits to the field.
To be certain that the Storage Module has been
connected to the CR23X during an execution of
P96, the user can:
•
Leave the Storage Module connected for a time
period longer than an execution interval
or
•
Use the SC90 9-Pin Serial Line Monitor. The
SC90 contains an LED which lights up during
data transmission. The user connects the SM
to the CR23X with the SC90 on the line and
waits for the LED to light. When the light goes
off, data transfer is complete and the SM can
be disconnected from the CR23X.
4.4.3 8 DUMP TO STORAGE MODULE
In addition to the on-line data output procedures
described above, output to the Storage Module
can be manually initiated in the
8
Mode.
The procedure for setting up and transferring
data is as follows:
1. Connect the Storage Module to the CR23X
using the SC12 cable.