Summary of Contents for Ewave SuperSCREAMER
- Page 1 EWAVE Inc. 7419 Gracefield Ln. Dallas, Texas 75248 (972) 248-2931 www.electrowave.com Ewave Radio Modem Technical Manual Version 1.02 Ewave Radio Modems covered in this manual: SuperSCREAMER BaseWAVE SCREAMER 422 STAMPER...
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Page 2: Table Of Contents
Ewave Radio Modem User’s Manual V1.02 OVERVIEW............................3 INSTALLATION..........................5 THEORY OF OPERATION ....................... 6 ..................6 NATOMY OF AN WAVE ADIO ODEM ........................7 ONNECTOR OUTS ............................... 7 & R ONNECTION TO ARALLAX ASIC TAMP FOR EMOTE EBUGGING EMOTE ROGRAMMING .............. -
Page 3: Overview
The Ewave family of wireless radio-frequency data modems are designed for systems requiring the full-duplex transmission and reception of wireless data. All Ewave family members are based on the RF10K™ core. The RF10K™ core uses our 900 MHz full- duplex transceiver, coupled with our proprietary dual RISC processor modulation/demodulation engine. - Page 4 Ewave Radio Modem User’s Manual V1.02 • An Enhanced Modem is also available which includes all the above Protocol features in one Modem, and allows software feature selection on-the-fly. • Supply Voltage: • +5VDC supply voltage (3.3VDC also available) 140mA.
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Page 5: Installation
Ewave Radio Modem User’s Manual V1.02 2 Installation There are no special installation requirements for the Ewave Radio Modems, however, for best performance, the modems’ antennae should be oriented parallel to each other and perpendicular to the ground. Please refer to Ewave’s On-line Support Center at http://www.electrowave.com/support.shtml... -
Page 6: Theory Of Operation
Note that it is possible to implement various “multi-drop” or “multi-node networks” schemes with the Ewave Radio Modems – a single modem of one type communicating with several of the opposite type. For example, this can be done through on-the-fly control of Transmit Power. -
Page 7: Connector Pin-Outs
Radio Modems may be used for remote-programming/remote-debugging of the Parallax Basic Stamp Processors. The diagram below shows how the two Ewave Radio Modems should be connected between the PC and the PBASIC part: Copyright © 2001 by Ewave, Inc. -
Page 8: Characteristics Of Packet Radio Communication
Ewave Radio Modem User’s Manual V1.02 3.5 Characteristics of Packet Radio Communication The Ewave packet radio modem has been designed to be a transparent, drop-in replacement for a serial connection, and employs a number of automatic optimizations for this purpose. Nevertheless, a basic... -
Page 9: Fine-Tuning The Ewave Radio Modem For Your Application
Errors and interference are much more common in a wireless communications system compared to a wired one. The effect of this is to increase latency and decrease bandwidth. For instance, if the Ewave Radio Modem is programmed for automatic retry/acknowledge of data, a sufficient level of radio interference may in effect increase the latency to infinity and decrease the bandwidth to zero. -
Page 10: Ewave Radio Modem Protocol Configurations
This parameter should be set to zero to minimize latency – in this case, the Ewave Radio Modem will begin transmitting as soon as a single byte is sent to the modem. -
Page 11: Command State Vs. Data State
Retries 3.8 Command state vs. Data state Normally the Ewave Radio Modem is in the Data state, in which all bytes sent to the modem via its serial port are treated as user data and transmitted. Depending on the configuration of the Ewave Radio Modem, it may also be possible to place the modem in Command state. -
Page 12: The Superscreamer™ With Dynamic Protocol Support
Regular Ewave Radio Modems are pre-programmed at the factory with firmware specific to their expected use. The Enhanced SuperSCREAMER includes support for all protocol capabilities in one unit, and may be dynamically re-configured by the user. This is done using the MODE command (described below) which is only available with the Enhanced SuperSCREAMER model. -
Page 13: Commands
Ewave Radio Modem User’s Manual V1.02 4 Commands This section describes the format of all Ewave Radio Modem commands. It assumes the modem has already been placed in Command state as described above. Commands consist of a single “command byte”, all of which are printable ASCII characters, followed by zero or more “argument bytes”. -
Page 14: Query Station Type
Example: (user sends command… Note: no line-terminator is needed.) (modem responds…) Mobl<CR><LF> OK<CR><LF> 4.4 SET MODE OF MODEM (SuperSCREAMER Only) Send: “Fast” mode, used for normal wireless link. Auto packetizes data, with dynamic packet sizes. “Fast” mode is used when the highest speed data link possible is required. -
Page 15: Tx Power On/Off
Ewave Radio Modem User’s Manual V1.02 4.6 TX POWER ON/OFF Send: Transmitter Power On. Transmitter Power Off. Radio Modem can still receive incoming radio packets while Tx Power is Off. 4.7 RETRY ON/OFF Send: Retry/Ack. On; The modem will automatically re-send the data packet until it is acknowledged by the other modem. -
Page 16: Set Wait-Time Before Transmittal
Ewave Radio Modem User’s Manual V1.02 Desired Packet Size Threshold (in bytes) Value of x Value of x Command to send (hex) (decimal) 0x4F PO (letter Oh) 0x4E 0x4C 0x48 0x40 32 (internal FIFO limits this to 29) 0x30 P0 (numeral zero) In nearly all circumstances the user will want to set the Packet Size Threshold to the maximum value (e.g.,... -
Page 17: Specifications
Ewave Radio Modem User’s Manual V1.02 5 Specifications Voltage (V): 5.0 regulated, OR 7.2-10 unregulated Current (A) 140 mA TX power on Current (A) 100 mA TX Power off Sustained Data Rate: 9600 baud or 1071 bytes/sec Burst Data Rate: 38.4 K baud... -
Page 18: Transmit Frequencies
Ewave Radio Modem User’s Manual V1.02 6 Transmit Frequencies Channel # Mobile (Short Ant) Base (Long Ant) TX Freq (MHz) TX Freq (MHz) 902.079 925.991 902.129 926.041 902.179 926.092 902.230 926.142 902.280 926.192 902.330 926.242 902.380 926.293 902.431 926.343 902.481 926.393... -
Page 19: Ordering Information
Please consult our web site the latest pricing and ordering information: http://www.electrowave.com/ 8 OEM Options Should our standard Ewave Radio Modem product line does not fit your needs, Ewave, Inc. can provide custom OEM solutions. We have the design capabilities to do unique board layouts, features and packaging. -
Page 20: Revision History
Ewave Radio Modem User’s Manual V1.02 9 Revision History February 11, 2001 – M. Shepard -- Initial revision. May 18, 2001-- PSA – Release V1.01 August 3, 2001 – MNS – Release V1.02: three typos Copyright © 2001 by Ewave, Inc.
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