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DWA3 Datasheet(PDF) 5 Page - Radiometrix Ltd |
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DWA3 Datasheet(HTML) 5 Page - Radiometrix Ltd |
5 / 7 page Radiometrix Ltd DWA3 Data Sheet page 5 Serial data should be in the following format: 1 start bit, 8 data bits, no parity, 1 or 2 stop bits 9600bps 0V=low, 5V=high STATUS pin can be connected to one of the port pins which can generate an interrupt on low-to-high transition (e.g. RB0/INT pin in the PIC). This can be used to enter a receive sub-routine to download data received from remote DWA3. Therefore, the host does not need to wait in a loop for a packet. Range test and site survey can be carried out by connecting an LED on the STATUS pin. Every time, DWA3 is within range to receive valid data, the LED will flicker. Interfacing DWA3 to an RS232 port Figure 6: DWA3 interfaced to an RS232 port via an RS232 line driver/receiver STATUS pin in this can be connected to CTS, DSR and DCD pin to simulate a flow control signal. DWA3 is capable of continuously streaming data at 9600bps. Therefore, STATUS pin is not asserted to stop the Host from sending data as in normal RTS/CTS flow control method, but merely to warn the host that there is already data in the receive buffer which need to be downloaded before sending any more data. Some DTE hosts assert DTR signal when they are active and this can be used via RS232 line receiver to enable DWA3. Otherwise the ENABLE must be physically pulled-low to activate the DWA3. NOTE: An interface board (with MAX232 type buffer, 9 way D connector, 5V voltage regulator and SMA RF connector) is available. This board is 61mm x 33mm in size. |
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