Campbell PC208W, Instruction Manual

Page: 108 / 156

Section 5. Stg Module: SMS - Storage Module Software
5-6 PC208W, Version 3.3, Instruction Manual
Via Datalogger
As an example, when an SM192/716 module is connected to a CR10(X),
CR23X, CR500 or CR510 datalogger with an SC12 cable, direct
communications can be established between the computer and the storage
module (see Figure 5-4). Note, however, that the CR10(X), CR500, and CR510
dataloggers can only support a maximum baud rate of 9600.
PC
SC32A
CR10(X)
7026,
SC25PS
or
equivalent
cable
SC12
Cable
SM192
or
SM716
FIGURE 5-4. Connecting the SM192/716 to a PC and a
CR10(X) Datalogger
SMS can automatically detect if a datalogger which supports direct
communication is present and request that a connection be made to the Storage
Module. In these circumstances the Via Datalogger checkbox can be used for
connection. This sets the baud rate to 9600 and enables the Target Address
checkbox. If this Via Datalogger is not selected and you attempt to connect to a
storage module, SMS will detect the datalogger’s presence and adjust the baud
rate accordingly.
Target Address
The Target Address selector is disabled unless you check the Via Datalogger
box, because this is the only mode which supports multiple storage modules
simultaneously.
An appropriate datalogger can be connected to up to eight storage modules
simultaneously, each having a different address. The address selector is used to
specify the address of the module to which you wish to connect. Note,
however, that any module having a high address may answer to a call of a
lower address if no module of the lower address is present.
For example, if only one storage module with an address of 8 is present, and
you set the target address to 1, you will still be able to connect to the storage
module. However, if your module had an address of 1 and your target address
was set to 5, you could not connect.
The above shows that the target address need not represent the actual address
of the Storage Module. The physical address of the Module is shown on the
“ Advanced” status page. Changing the physical module address will not
change the selected target address, and, in fact, changing the physical address
will not have any noticeable effect until you disconnect from the Storage
Module.