Measurement-computing PCI-COM232 Bedienungsanleitung PDF herunterladen (Seite 8)

Figure 2-1. TTY Settings

4. Launch the ComApp again. You will get a second ComApp window. Go to the

Settings

menu and configure the second port. Note that you must use the same settings on both ports

for this test to work properly.

5. On both open ComApp windows, go to the

Action

menu and select

Connect.

6. Once connected, move the cursor to either ComApp window. Whatever is typed in that

window should be immediately displayed in the other. You may also test port operations by

selecting the

Transfer

menu and clicking on

Send Data Block.

A large block of ASCII

characters will automatically be sent, and should appear on the other ComApp window.

2.5 Extended Baud Rate Operation

Though it isn’t possible to set baud rates greater than 115.2 kbaud on the PCI-COM series using the

standard Windows

Communications Port Properties

dialog, the board and operating system are actually

capable of operating at transfer rates up to 460.8 kbaud. The PCI-COM series boards have a

programmable divider between the on-board system clock and the UART. This divider can be set using

the

Advanced

tab that was added to the Windows 95/98

Communications Port Properties

dialog, or the

PCIcom applet added to the NT/2000 Control Panel during the PCI-COM software installation.

If the divider is set to divide-by-4 (the default setting) the board’s baud rate is exactly as Windows sets it.

If the divider is set to divide by two, all the actual board baud rates become double what Windows has set

them to, while if the divider is set to divide by one, the board’s baud rate is four times the baud rate set in

Windows. These selections are summarized in the table below. We have only shown the values for the

baud rates higher than normally supported by windows.

UART Windows baud Actual

Clock Rate Divider

rate setting baud rate

1.8432 MHz 4 (default) 115.2 kbaud 115.2 kbaud

3.6864 MHz 2 115.2 kbaud 230.4 kbaud

7.3728 MHz 1 115.2 kbaud 460.8 kbaud

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Measurement-computing PCI-COM232 Bedienungsanleitung Seite 8