Moxa NPORT 5110-T Instrukcja Użytkownika Pobierz pdf (Strona 72)

NPort 5100 Series Configuring NPort Administrator

6-19

5. Select COM Settings to modify COM No., default setting, etc.

6. Select the COM Number.

COM ports that are “In use” or “Assigned” will also be indicated in this drop-down list. If you select multiple

serial ports or multiple NPort 5100s, remember to check the “Auto Enumerating” function to use the COM

No. you select as the first COM No.

7. Hi-performance mode is the default for Tx mode. If the driver completes sending data out to the NPort

5100, the driver will respond “Tx Empty” to the program.

Under classical mode, the driver will not notify the user’s program that Tx is completed until all Tx data

has been sent out from the NPort 5100; this mode will cause lower throughput. If you want to ensure that

all data is sent out before further processing, classical mode is recommended.

Enable/Disable Tx/Rx FIFO. If disabled, the NPort 5100 will send one byte each time the Tx FIFO

becomes empty; and an Rx interrupt will be generated for each incoming byte. This will result in a faster

response and lower throughput. If you want to use XON/XOFF flow control, we recommend setting FIFO to

Disable.

Fast Flush (only flush local buffer)

• We have added one optional Fast Flush function to Moxa’s new NPort Real COM driver. NPort

Administrator Suite for 2G NPort adds it after version 1.2.

• For some applications, the user’s program will use the Win32 “PurgeComm()” function before it reads or

writes data. With our design, after the program uses this Purge Comm() function, the NPort driver will

keep querying the NPort’s firmware several times to make sure there is really no data queued in the

NPort firmware buffer, rather than just flushing the local buffer. This kind of design is used because of

some special considerations. However, it might take more time (on the order of several hundred

milliseconds) than a native COM1, because it needs to work via Ethernet. That’s why the native COM

ports on the motherboard can work fast with this function call, but the NPort requires much more time.

1 2 ... 67 68 69 70 71 72 73 74 75 76 77 ... 93 94

Brak uwag

Moxa NPORT 5110-T Instrukcja Użytkownika Strona 72