Tripp Lite USA-19HS Owner's Manual for USA-19HS Windows v3.7S 933021 - Page 19

Serial Test Options

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Receive FIFO Buffer Size pull down menu The Receive FIFO Buffer Size pull down menu allows you to configure the number of characters which are stored in the card's "First In First Out" input buffer ("FIFO") before they are made available to the computer. The default value of this parameter is "16". The Receive FIFO improves the reliability of data transfer at high speeds. You can turn this option OFF for performance reasons however this is not necessary in most cases. If you are receiving data from your serial device at speeds of 9600 baud or lower, you may want to set the Receive FIFO Buffer Size to None. This setting is set per port (ie if you have a multi port Keyspan adapter, you can set one port to have one setting and another port to use a different setting). Once you make this change, click the Update Configuration button to upload the new settings to your adapter. Update Configuration button The Update Configuration button updates the Keyspan adapter with the changes you have made in the Properties tab. Please note that these changes will take effect when you click the Update Configuration button. - Serial Test Options The Test This Port button tests the COM port selected in the Port pull down menu (in the Serial Port Option section in the Properties tab). The test that is performed is the selected test in the Test Option box. Note: The baud rate shown here is only used to configure the Serial Test. If your serial device's software does not provide the necessary port settings to our adapter and you need to specify the default port settings (ie baud [bits per second], data bits, parity, stop bits, and flow control), you set these settings in the Device Manager (right-click your Keyspan COM port in the Ports (COM & LPT) heading and then select Properties and then click the Port Settings tab). Test This Port button The Test This Port button tests the COM port selected in the Port pull down menu (in the Serial Port Option section in the Properties tab). The test that is performed is the selected test in the Test Option box. Test Mode box The Test Mode box allows to specify the type of test that will be performed when you press the Test This Port button. There are 3 types of tests: TX Only: Use this test to test only the transmit (Tx) signals of the Keyspan adapter. Ext. LoopBack: Use this test sending and receiving data. This test sends data out the selected serial port and waits to receive it via a special Loopback connector. You can find more information about this special Loopback connector in the Serial Port Pin Outs section in this manual. IMPORTANT! This test will fail if you did not make and connect a custom Loopback connector. Int. Loop Back: Use this test sending and receiving data. This test is performed within the Keyspan adapter hardware. This test DOES NOT require a special Loopback cable. Test Type box The Test Type box allows to specify how many times the selected test will be repeated when you press the Test button. Use the Quick option to perform the test once. To perform a subsequent test, press the Test This Port button. Use the Continuous option to repeat the test continuously. To USA-19HS - User Manual Page 19 of 30

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Receive FIFO Buffer Size
pull down menu
The Receive FIFO Buffer Size pull down menu allows you to configure the number of characters
which are stored in the card's "First In First Out" input buffer ("FIFO") before they are made avail-
able to the computer. The default value of this parameter is "16".
The Receive FIFO improves the
reliability of data transfer at high speeds.
You can turn this option OFF for performance reasons
however this is not necessary in most cases.
If you are receiving data from your serial device at
speeds of 9600 baud or lower, you may want to set the
Receive FIFO Buffer Size
to
None
.
This
setting is set per port (ie if you have a multi port Keyspan adapter, you can set one port to have
one setting and another port to use a different setting).
Once you make this change, click the
Up-
date Configuration
button to upload the new settings to your adapter.
Update Configuration
button
The Update Configuration button updates the Keyspan adapter with the changes you have made in
the Properties tab.
Please note that these changes will take effect when you click the Update
Configuration button.
- Serial Test Options
The Test This Port button tests the COM port selected in the
Port
pull down menu (in the Serial Port
Option section in the Properties tab).
The test that is performed is the selected test in the Test Op-
tion box.
Note:
The baud rate shown here is only used to configure the Serial Test.
If your serial device's software
does not provide the necessary port settings to our adapter and you need to specify the default port
settings (ie baud [bits per second], data bits, parity, stop bits, and flow control), you set these set-
tings in the Device Manager (right-click your Keyspan COM port in the
Ports (COM & LPT)
heading and
then select Properties and then click the
Port Settings
tab).
Test This Port
button
The Test This Port button tests the COM port selected in the Port pull down menu (in the Serial Port
Option section in the Properties tab).
The test that is performed is the selected test in the Test
Option box.
Test Mode
box
The Test Mode box allows to specify the type of test that will be performed when you press the
Test This Port button.
There are 3 types of tests:
TX Only:
Use this test to test only the transmit (Tx) signals of the Keyspan adapter.
Ext. LoopBack:
Use this test sending and receiving data. This test sends data out the selected serial port and
waits to receive it via a special Loopback connector.
You can find more information about this
special Loopback connector in the
Serial Port Pin Outs
section in this manual.
IMPORTANT!
This test will fail if you did not make and connect a custom Loopback connector.
Int. Loop Back:
Use this test sending and receiving data. This test is performed within the Keyspan adapter
hardware. This test DOES NOT require a special Loopback cable.
Test Type
box
The Test Type box allows to specify how many times the selected test will be repeated when you
press the Test button.
Use the Quick option to perform the test once. To perform a subsequent
test, press the Test This Port button.
Use the Continuous option to repeat the test continuously. To
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