Siemens 3964R User Manual page 37

7. Click Advanced. The Advanced Port Settings dialog box appears:
8. Lower the default Receive Buffer and Transmit Buffer settings to their minimum.
Lowering these settings may solve I/O communication problems for portable
computers (notebook, or laptops) and framing errors for standard computers.
9. If you are using a 16550 UART chip, select the Use FIFO buffers (requires 16550
compatible UART) option. If you are not using a UART chip, make sure this
option is not selected.
If you are using the Windows NT operating system, verify the following:
1. Click Start on the Windows task bar. Point to Settings, then click Control Panel in
the menu. The Control Panel dialog box will appear.
2. Double-click the Ports icon, the Ports dialog box will appear.
3. Select a port and click the Settings button. The Settings for COMx dialog box
appears:
4. Click Advanced. The Advanced Settings for COMx dialog box appears:
5. Set the Interrupt Request Line (IRQ) value to the minimum. Lowering this setting
may solve I/O communication problems for portable computers (notebook, or
laptops) and framing errors for standard computers.
6. If you are using a 16550 UART chip, select the FIFO Enabled option. If you are
not using a UART chip, make sure this option is not selected.
How long is your RS-232 cable?
Fifteen meters (fifty feet) is the maximum practical length for the RS-232 standard.
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