Moxa UPort 1250I [26/50] Uport 1200 1400 1600 series driver installation
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Moxa UPort 1250I [26/50] Uport 1200 1400 1600 series driver installation

Moxa UPort 1650-16 [26/50] Uport 1200 1400 1600 series driver installation
UPort 1200/1400/1600 Series Driver Installation
2-14
Tx Mode
Setting Factory Default Necessity
Hi-Performance,
Classical
Hi-Performance Required
To improve the write performance, you can select Hi-Performance mode. 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 UPort; this mode
will cause lower throughput. If you want to ensure that all data is sent out before further processing, classical
mode is recommended. Classical mode is the same as the COM Port behavior: The WriteFile() call will only
finish when all queued data are sent out.
Fast Flush
Setting Factory Default Necessity
Enable/Disable Enable Required
1. 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 PurgeComm() function, the UPort driver will
keep querying the UPort’s firmware several times to make sure that no data is queued in the UPort’s
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 (about several hundred milliseconds) than a
native COM1, because it needs to work over Ethernet. This is why the native COM ports on the motherboard
can work fast with this function call, but the UPort requires much more time.
2. To begin with, make sure there are some PurgeComm() functions being used in your application program.
In this kind of situation, you might find that your UPort exhibits a much poorer operation performance than
when using the native COM1 port. Once you have enabled the Fast Flush function, you can check to see if
there has been an improvement in performance.
3. By default, the optional Fast Flush function is enabled, which allows the UPort driver to work faster when
using the PurgeComm() function.
4. Win32 function PurgeComm() with PURGE_TXCLEAR will clear all queued Tx data. But for some
applications, it will call this function for each transaction and result in low throughput. To avoid this, you can
enable this function. The driver will only clear the data queued in the local buffer; it will not send firmware
through the USB port to clear the data queued in the firmware buffer.
Interface
UPort 1410, 1610-8, 1610-16
Setting Factory Default Necessity
RS-232 RS-232 Required
UPort 1250, 1250I, 1450, 1450I, 1650-8, 1650-16
Setting
Factory Default
Necessity
RS-232, RS-422,
4-wire RS-485, 2-wire
RS-485
RS-232 Required
Reset default
If you click the Reset default button, all the settings will return to Factory default settings:
COM Number: <Assign available COM number automatically>
Tx Mode: Hi-Performance
UART FIFO: Enable
Fast Flush: Enable
Interface: RS-232

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