OnCell G3100 Series Software Installation/Configuration
FIFO
If FIFO is Disabled, the OnCell G3100 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
G3100 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 G3100. 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
G3100. 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 G3100 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 G3100. 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 G3100 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 G3100 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 G3100 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
Windows Driver Manager receives the Auto IP Report message, it will change the IP address of the COM
mapping entry for the OnCell G3100 whose LAN MAC address is specified in the following MAC address field.
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