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If the channel number is changed using the ATHP command, and power is
later lost, the channel number will be retained in non-volatile memory as long
as was saved using the ATSV (Save to non-volatile memory) command.
Due to the nature of the synthesizer used in the FireLine’s radio, the
frequency programmed into the unit must be an even multiple of its internal
reference frequency. For narrow-band radios (12.5kHz channels), the user’s
frequency must be a multiple of either 6.25khz or 5.00kHz. For wide-band
models, the frequency must be an even multiple of 10kHz or 12.5kHz.
5.3. Data Transmission
To transmit data, simply send one or more bytes of data into the serial port of
the modem. When a full packet of data has been collected into the internal
buffer of the modem, or when there is a pause in the data, the modem will
automatically key its transmitter, and send the data over the air.
Serial Port Baud Rate
While the modem is transmitting, the user may continue to send more data
into the FireLine. Because the buffers in the FireLine are full-duplex, the serial
port data rate and the over-the-air data rates are independent. The serial port
baud-rates may be set slow to accommodate legacy equipment, or set at
high-speed to minimize latency. The over-the-air data rate us usually 4800
baud for narrow-band channels, and 9600 baud for wide-band, although
faster or slower rates may be used.
In Packet Mode, selection of the serial port baud-rate is important. As shown in
Figure 1 (Packet Mode of Operation) above, if the serial port baud-rate is the
same as the over-the-air baud rate and the packets are short, the channel
utilization is only about 50%. But, if the serial port baud rate is set much
higher, say 2-8X the over-the air rate, the channel utilization becomes near
100%.
Because the FireLine can handle serial-port data rate far in excess of the
over-the-air rate, the efficiency of the FireLine in Packet Mode is
approximately the same as other brand modems that cannot operate in a
Packet Mode — with the added benefit or ARQ, error-free data, and
addressing.
Note that many Windows applications which use the serial port, such as
HyperTerminal, put large gaps between the bytes of data they send out the
serial port. If an application is not getting the desired throughput, verify that it
is not an artifact of the Operating System or the computer.
Flow Control
If large amounts of data will be sent with the FireLine, it may be possible to
overflow the internal data buffer. To ensure the transmit buffer does not
overflow, enable and use hardware flow control. Hardware flow control is
enabled with the ATCH 1 command. Note that the FireLine modem will
always indicate the status of its internal buffer using the CTS signal on the
- F i r eL i n e 1
- Table of Contents 2
- 1.1. Congratulations! 3
- 1.2. NOTICE 3
- 2. Overview 6
- 3. Specifications 7
- 3.5. Model Numbers 8
- 4.1. LEDs 9
- 4.2. DC Power 9
- 4.6. Low Power Mode (LPM) 13
- 5.1. Setup 16
- 5.3. Data Transmission 18
- 5.4. Data Reception 19
- 5.6. Error Correction 23
- 5.11. Carrier Detect 28
- 5.9. Baud Rate Selection 28
- 5.10. Bit Errors 28
- 6. Installation 30
- 7. FCC Licensing Information 30
- 8. User Serial Port Commands 32
- 8.4. Reading a Parameter 33
- 8.5. CONFIG Button 33
- 8.8. Command Mode Commands 36
- Raveon Technologies Corp 37
- 8.9. Default Frequencies 39
- 9.4. ATST Command 43
- 9.5. ATST2 Command 43
- 9.6. ATST3 Command 44
- 9.7. ATST4 Command 44
- 9.8. AutoStatus 44
- Company Confidential 45
- 10. Tune-up and Alignment 46
- 10.3. Center Frequency 47
- 10.4. TX Deviation 47
- 10.7. RX Carrier Detect 48
- 10.8. MURS Operation 49
- 11. SkyLine Compatibility 50
- 12. Antenna Information 52
- TxD (INPUT) 54
- Compatibility issues 56
- 15. Troubleshooting 58
- 16. Mechanical 60
- 17. Use with External Radio 61
- 17.4. Connections 62
- 17.5. Calibration 63
- Limited One Year Warranty 64
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