Siemens 3964R User Manual page 34

30
2. On Windows 3.1 or Windows for Workgroups, start the Terminal program. On
3. Configure the Terminal (or HyperTerminal) program to use the same
4. Connect a null modem cable to a second computer's port.
5. On the second computer, start and configure the Terminal (or HyperTerminal)
6. Verify that you can send data between the two computers.
7. If the communication port does not appear to be functioning properly, check your
8. If the previous step was unsuccessful, try another communications port or another
Note A common misconception is that if you can connect to a PLC with a DOS
program, that the same communication port will work in Windows - this is not the case!
Windows is an entirely different environment than DOS.
What type of UART is on the COM port?
If it is not a 16550, then you must lower your baud rate to 9600 or slower. Only the
16550 UART can sustain continuous, error free communications at speeds higher than
9600 baud. Other UARTs may work at speeds faster than 9600 baud, but errors may be
written to the Wonderware Logger. For example, "Receive Overruns." To determine
which UART you have, enter MSD at a DOS prompt, then choose COM Ports from the
MSD menu.
If you are running Windows for Workgroups, verify the following:
1. Verify the following lines are added to the [386 enh] section of your system.ini file
2. If you are running Windows for Workgroups (Version 3.1 or later), you need to
Windows 95 or Windows NT, start the HyperTerminal program.
communication port with the same settings (baud rate, parity, stop bits and so on)
as the hardware device.
program with the same settings as the first computer.
If you do not have two computers and the computer you are using has another
port, start two instances of the Terminal (or HyperTerminal) program with
each configured to their own port, then try communicating between them.
If you have an external modem, connect the modem to the communication port
that you are testing and see if you can dial out.
environment files (AUTOEXE.BAT, CONFIG.SYS, SYSTEM.INI, and
WIN.INI). Look for suspicious programs or drivers that might be taking control of
the port or its interrupt before the server is loaded. Always try to keep your
environment files as clean as possible. If you are in doubt about an entry, comment
it out.
computer.
that is located in your \Windows directory:
EMMEXCLUDE=A000-EFFF
COMxFIFO=0
Where x specifies the COM port number. You need to add a separate COMxFIFO
line for each serial port using a 16550 UART chip.
download .386 (this file fixes a Microsoft bug) from the Wonderware
SERIAL
Bulletin Board System (714-727-0726) or from the Wonderware WEB site at:
http://wondertech.wonderware.com.
The file is 10620 bytes and has a date of 2/17/94. It is contained in a self-
extracting zip file called wg1001.exe. The file is located in the "PatchFix
Library" on the Wonderware BBS in the File Transfers / Patchfix area.