Appendix C
Troubleshooting and Common Questions
©
National Instruments Corporation
C-11
ENET-232 and ENET-485 Series User Manual
Why does the Device Manager report there is no driver installed for
remote serial ports?
(Windows 2000 only)
This is normal for serial device server ports. Because
the serial device server is installed separately, the Device Manager does not
display its information.
Why can’t I configure remote serial ports directly from the Device
Manager?
(Windows 2000 only)
The remote serial ports are listed in the Device
Manager for informational purposes only. To change the configuration
information of a serial device server port, use the NI Ports integrated
control panel. For more information on NI Ports, refer to Chapter 4,
I changed the hostname and/or IP address of my serial device server.
Why can I no longer communicate with my devices?
You must update the serial device server configuration information in
NI Ports.
1.
Select
Start»Settings»Control Panel»NI Ports
.
2.
Select the serial ports associated with the serial device server that you
reconfigured and click
Delete
.
3.
Add the serial ports back to your system using the updated hostname
and/or IP address. For more information, refer to the
section in Chapter 4,
4.
Reboot your computer for the changes to take effect.
5.
Run the Serial Device Server Diagnostics utility as described in
Chapter 5,
Why does the CreateFile API fail when I try to open a serial port that
is assigned COM12 on the serial device server?
The
CreateFile
function from the Microsoft Win32 API fails for port
names COM10 and higher. To use these ports successfully with this
function, append the string
\\.\
before the port name. For example, when
using the C programming language to open COM12, use the following
string for the port name:
“\\\\.\\COM12”
