Instruction manual
SECTION 5. STG MODULE: SMS - STORAGE MODULE SOFTWARE
5-4 PC208W, Version 3.0, Instruction Manual
• A high level of communications activity on
another port.
• Lack of computer memory, causing the
computer to do a considerable amount of
hard-disk paging. If the SMS
communication routines are paged to disk
and take too long to load back into memory,
the buffer can overflow.
If the communication errors are reported as
CE_RXOVER errors, reducing the baud rate will
help because it stops the buffer from filling up
too quickly in situations where SMS is not able
to respond to the incoming data.
Via Datalogger/Target Address (SM192/716
Modules Only)
When an SM192/716 Storage Module is
connected with an SC12 cable to a datalogger
which supports direct communications
(CR10(X) or CR500), you can establish
communications using the “Via Datalogger”
mode as explained below.
Via Datalogger
As an example, when an SM192/716 module is
connected to a CR10/10X or CR500 datalogger
with an SC12 cable, direct communications can
be established between the computer and the
storage module (see Figure 5-4). Note,
however, that dataloggers can only support a
maximum baud rate of 9600.
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 does nothing more than set
the baud rate to 9600 and enable the Target
Address checkboxes. If you “uncheck” this box
but keep the baud rate at 9600, you can still
connect via the datalogger if one is there.
Target Address
The Target Address selector is disabled unless
you check the Via Datalogger box. This is to
prevent confusion, as the Target Address boxes
only have an effect if a datalogger supporting
direct communications is connected.
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 would
not
connect.
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