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RPM1-173.225-3 Datasheet(PDF) 4 Page - Radiometrix Ltd |
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RPM1-173.225-3 Datasheet(HTML) 4 Page - Radiometrix Ltd |
4 / 15 page Radiometrix Ltd. VHF Narrow Band FM Radio Packet Modem page 4 2 The Host Interface 2.1 SIGNALS The connection to the RPM is a full duplex serial interface supporting baud rates from 600bps to 115200bps. Additional control signals are provided to assist in flow control, configuration and power saving in the RPM1. Figure 5: Physical dimensions and pinouts Pin name Pin Pin Function In/Out Description RF GND 1, 3 RF signal ground BNC casing/coax braid connection RF 2 RF signal Input or Output Antenna pin/coax core connection RXSELCT 4 Receiver Select Input or Output Internal RF Receiver Enable to BiM1 or RF Receiver Active Indicator TX SELECT 5 Transmitter Select Input or Output Internal RF Transmitter Enable to BiM1 or RF Transmitter Active Indicator TXD/AF 7 Transmitted Data or demodulated signal Input or Output Transmitted Packetised Data to BiM1 Analogue Demodulated signal from BiM1 D3 8 FRPC Data line NC Internal data line between RPM and FRPC D2 9 FRPC Data line NC Internal data line between RPM and FRPC SIGNAL 10 Preamble Detect Output Valid preamble indicator RST 11 FRPC reset NC Resets FRPC which also isolates BiM1 RXA 12 Receive Acknowledge NC RPM to FRPC download Request Acknowledge RXR 13 Receive Request Output Valid Data packet indicator RESET 14 Reset Input Hardware reset of the RPM1 SETUP 15 Enter Setup Input Enter RPM1 configurator after a RESET WAKE/DTR 16 Wake or Shutdown Input Wakes RPM1 when low, shuts down when high TXD 17 Serial transmitted data Input Host (DTE) to RPM1 serial transmit data RXD 18 Serial Received data Output RPM1 to host (DTE) serial received data CTS 19 Clear To Send Output Hardware flow control of data from host (DTE) DEFAULT 20 Force 9600bps Input Force the RPM1 serial interface to 9600bps VCC 21 Vcc Supply Input +5VDC or +3.3VDC GND 6, 22 Ground - Supply Ground internally connected to RF GND notes: 1. RXD/TXD lines are true data 2. Active low SETUP, DEFAULT inputs require external 10kΩ pull-up to VCC. 3. Logic levels are 5V CMOS unless 3.3V variant is used. 4. WAKE pin should be pulled to ground if DTE cannot provide DTR signal 5. TXSELECT, RXSELECT, SIGNAL, RXR, CTS can be connected to LEDs via 1kΩ series resistors 2.2 RADIO PACKET MODEM RESET RESET The Reset signal is internally pulled up to Vcc via a 10k Ω resistor. A reset aborts any transfers in progress and restarts the RPM1. HOST DRIVEN RESET Minimum low time: 1.0 µs, after reset is released (returned high). The host should allow a delay 1ms after reset for the RPM1 to initialise itself. |
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