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DWA3-869.85-9 Datasheet(PDF) 2 Page - Radiometrix Ltd |
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DWA3-869.85-9 Datasheet(HTML) 2 Page - Radiometrix Ltd |
2 / 7 page Radiometrix Ltd DWA3 Data Sheet page 2 Pin description Pin Name Function 1 GND Ground 2 Vcc 5V regulated power supply (4.75 - 5.25v) 3 ENABLE Pull low to enable module 4 SETUP Pull low to enter Test/Setup mode (5V CMOS logic. Pull up to 5V) 5 TXD Transmit Data (Inverted RS232 in at 5V CMOS logic, No pullup) 6 NC No Pin 7 RXD Receive Data (Inverted RS232 output at 5V CMOS logic output) 8 STATUS RX Busy, Data in receive buffer (5V CMOS logic output) 9 GND Ground NOTE: 1. ENABLE and SETUP have 10K pullups to Vcc. TXD has none (if used in RX only, tie this pin to +5v) 2. Vcc must be a 5v regulated supply (4.75 - 5.25v) 3. Pinout is as TDL2A. (It is, however, longer than 33mm, with a ceramic patch antenna replacing the RF pins) 3. TXD / RXD are inverted RS232 at 5v cmos levels. To connect to a true RS232 device, inverting level shifters must be used (MAX232 type are ideal, but simple NPN transistor switches with pullups often suffice). With typical microcontrollers and uarts, direct connection is possible. 3a DWA3 is compatible with the TDi2 interface board (which provides a MAX232 type buffer, 9 way D connector, 5v voltage regulator and support circuits) provided the SMA RF connector is not fitted. This board is 61mm x 33mm in size. 4. Rx_busy pin goes high when valid data is present in the receive buffer. 5. The DWA3 provides a half duplex link, but provided no two devices attempt to transmit at one time (a 'low' on RX_busy may be used as a primitive 'CTS' indication) no further restrictions on data transmission need be made, as all transmit timing, valid data identification and datastream buffering is conducted by the unit. There is no 'transmit enable' pin. Sync and framing words in the packet prevent the receiver outputting garbage in the absence of signal or presence of interference. 6. A simple addressing structure is included in the datastream. Units may be programmed onto one of eight addresses (all units are supplied set to default addr=0) 7. DWA3 uses a BiM3 series transceiver module (e.g. BiM3A-914-64, BiM3B-869-64) and the cpu circuitry of the TDL3F 8. This unit is programmed exactly as a TDL2A, with the channel select commands being ignored. Figure 2: DWA3 footprint (top view) |
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