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Troubleshooting I/O Server Communication Problems 57

Ø How long is your RS-232 cable?

Fifteen meters (fifty feet) is the maximum practical length for the RS-232 standard.

Ø Try using a different COM port for the I/O Server.

Ø If you are installing an I/O Server or configuring a board-based I/O Server on a

computer running on the Windows NT operating system, log on with

Administrator privileges.

8 Without Administrator privileges, the server and Server Install program cannot

make the necessary edits to the Windows NT Registry during installation or board

configuration of the server.

1. Click Start on the Windows taskbar. Point to Programs, then to Administrative

Tools (Common), and click User Manager in the menu. The User Manager dialog

box will appear:

2. Double-click the Username you typed in during log on.

3. If the User Properties dialog box does not appear, you do not have Administrator

privileges.

4. If the User Properties dialog box does appear, click on the Groups button and verify

”Administrators” is in the ”Member of” list.

Ø If you experience occasional or random communication errors in the Wonderware

Logger, such as "Response Timeouts," check for noise.

Do the physical cables run past any known noise sources such as photocopiers,

fluorescent lamps, fans, pumps, motors or generators? Are the cables properly shielded

from its environment? With radio modems and satellite link ups, occasional

communications errors in the Wonderware Logger are normal and to be expected as

long as they do not adversely impact the flow of data.

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