DVK-WLM400 Laird Technologies, DVK-WLM400 Datasheet - Page 31

• Manufacturer Part Number: DVK-WLM400
• Description: DEVELOPMENT KIT WISM+
• Manufacturer: Laird Technologies
• Type: Transceiverr

Specifications of DVK-WLM400

• Frequency: 2.4GHz
• Processor Series: WISM+
• Silicon Manufacturer: Laird Technologies
• Kit Application Type: Communication & Networking
• Application Sub Type: Wi-Fi Intelligent Serial
• Kit Contents: PCB, 2x Antennas, Power Adapter, USB Cable, RS-232
• Rohs Compliant: Yes
• For Use With/related Products: WLM400
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

On the WISM+ Host PC side…
DTR Hold Off function
The PCs Host COM port can be set up to use DTR (connected through the Dev Kit to WISM+’s
When the WISM+ input buffers become “mostly full” of transmit packets, WISM+ drives the DSR_READY pin to an
invalid state. The WISM+ host PC (running WIF.exe “TX Performance Test”) will hold off from transmitting packets to
the WISM+ until the DSR_READY becomes “ready”. If you do not have the serial connection, click the box
“Ignore WISM+ Flow Control (No DTR)”
WIF.exe’s Performance TX test “Transmit Status Window
Once you press START (in the above Transmit Test window), packet transmission beings. The following Transmit
Status window will be displayed while the packets are being transmitted.
NOTE:
Although the TX performance test can operate using any host interface, serial is very slow, and Ethernet
currently has packet transmit problems due to the WinPcap package. SPI works as well, but in all cases, the
throughput is held back due to how fast the packets can actually be given to the WISM+.
The TX Performance test
window will appear
© Laird Technology 2010
Launch WIF.exe with a USB connection (see section: “
From WIF.exe’s top menu, select…ToolsTx Performance Test
The number of packets
successfully transmitted
Click to Cancel the transmit
operation at any time during
the test.
Enter the number of
packets to transmit
Software- WIF
Select “Wireless LAN”
Enter the Remote PCs IP address
These selections are used to select
the PCs com port DTR to wait for the
WISM+’s DSR_READY hold off.
NOTE: See DTR hold off
discussion below…
When WIF.exe attempts to transmit a
packet to the WISM+ -and the DTR hold
off is active (the “Ignore WISM+ Flow
Control” check box in the Transmit test
window above- is not checked ) -it will
be recorded as a “Throttle Event”.
The will be quickly incremented as long
as the DTR Hold-Off condition exists.
Version 1.00
”)
WISM+ DVK MANUAL
DSR_READY ).
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