Moxa Technologies OnCell G3111-HSPA series, Руководство пользователя

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OnCell G3111/G3151-HSPA Series Software Installation/Configuration
B-10
FIFO
If FIFO is Disabled , the OnCell G3111/G3151-HSPA will transmit 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.
Network Timeout
You can use this option to prevent blocking if the target OnCell is unavailable.
Auto Network Re-Connection
With this option enabled, the driver will repeatedly attempt to re-establish the TCP connection if the OnCell
G3111/G3151-HSPA does not respond to background “check alive” packets.
Return error if network is unavailable
If this option is disabled, the driver will not return any error even when a connection cannot be established
to the OnCell G3111/G3151-HSPA. With this option enabled, calling the Win32 Comm function will result in
the error return code “STATUS_NETWORK_UNREACHABLE” when a connection cannot be established to the
OnCell G3111/G3151-HSPA. This usually means that your host’s network connection is down, perhaps due
to a cable being disconnected. However, if you can reach other network devices, it may be that the OnCell
G3111/G3151-HSPA is not powered on or is disconnected. Note that Auto Network Re-Connection must
be enabled in order to use this function.
Fast Flush (only flushes the local buffer)
For some applications, the user’s program will use the Win32 “PurgeComm()” function before it reads or
writes data. After a program uses this PurgeComm() function, the OnCell driver continues to query the
OnCell’s firmware several times to make sure no data is queued in the OnCell firmware buffer, rather than
just flushing the local buffer. This design is used to satisfy some special considerations. However, it may
take more time (about several hundred milliseconds) than a native COM1 due to the additional time spent
communicating across the Ethernet. This is why PurgeComm() works significantly faster with native COM
ports on the PC than with mapped COM ports on the OnCell G3111/G3151-HSPA. In order to accommodate
other applications that require a faster response time, the new OnCell driver implements a new Fast Flush
option. By default, this function is enabled.
If you have disabled Fast Flush and find that COM ports mapped to the OnCell G3111/G3151-HSPA perform
markedly slower than when using a native COM port, try to verify if “PurgeComm()” functions are used in
your application. If so, try enabling the Fast Flush function and see if there is a significant improvement in
performance.
Auto IP Report: When OnCell G3111/G3151-HSPA products are used in a dynamic IP environment, users
must spend more time with IP management tasks. For example, if the OnCell works as a server (Real COM
mode, TCP Server mode, or UDP mode), then the host, which acts as a client, must know the IP address of
the server. If the DHCP server assigns a new IP address to OnCell, the host must have some way of
determining OnCell’s new IP address.
OnCell G3111/G3151-HSPA products help out by periodically reporting their IP address to the IP location
server, in case the IP has changed. The parameters shown below are used to utilize the Auto IP report
function. Once the OnCell Windows Driver Manager receives the Auto IP Report message, it will change the
IP address of the COM mapping entry for the OnCell G3111/G3151-HSPA whose LAN MAC address is
specified in the following MAC address field.