Section 5. Stg Module: SMS - Storage Module Software
PC208W, Version 3.3, Instruction Manual
5-5
Baud Rate
The first time you use SMS with a storage module a default baud rate of
38,400bps and 19,200bps is automatically selected for the CSM1/MCR1 and
SM192/716 modules, respectively, if you are connected using an SC532. If
you are connecting to a storage module via a datalogger, the baud rate will
vary depending upon the datalogger chosen.
The default (maximum) baud rate (38,400bps for CSM1/MCR1 and 19,200 for
SM192/716) can be adjusted to your own requirements, depending on, among
other things, the speed of your COM port and processor speed.
When SMS reads data from the storage device, it automatically performs a
checksum test and requests that bad data be re-transmitted. If bad data is
detected, the computer will beep.
If communication errors occur, it may help to reduce the baud rate. Possible
reasons why good communications cannot be established using higher baud
rates under Windows are:
•
Using low-quality cards, or using generic drivers rather than the hardware
specific drivers.
•
Processor is loaded down by other applications (e.g., DOS programs set to
exclusive mode or other operating Window communication programs).
•
A computer without a buffered UART (Universal Asynchronous
Receive/Transmit) serial port (e.g., a 16550 UART), or without the FIFO
(First In First Out) option enabled. (Other communications problems can
occur if the computer does not actually have a buffered UART, but is
using the Windows 95 default configuration with the FIFO option
enabled.)
•
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 and SM4M/SM16M Modules
Only)
When an SM192/716 or SM4M/SM16M Storage Module is connected with an
SC12 cable to a datalogger which supports direct communications (CR10(X),
CR500, CR510, or CR23X), you can establish communications using the “ Via
Datalogger” mode as explained below.
Summary of Contents for PC208W
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