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Summary of Contents for Cervis MRF450
- Page 1 ™ MRF450 User Manual U077.0.2-MRF450 2014 Cervis, Inc.
- Page 2 This radio transmitter 7955A-MRF450 has been approved by Industry Canada to operate with the antenna types listed below with the maximum permissible gain and required antenna impedance for each antenna type indicated. Antenna types not included in this list, having a gain greater than the maximum gain indicated for that type, are strictly prohibited for use with this device.
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Page 3: Table Of Contents
Receive ..........................13 Error ..........................14 List of Figures Figure 1. MRF450 Front and Back ....................2 Figure 2. Dimensions (mils)/Locations ..................3 Figure 3. State Transitions vs. Current Consumption..............5 List of Tables ... - Page 4 Module RF450 Table 9. Receive Message Structure ..................13 Table 10. Error Message Structure .................... 14 U077.0.2-MRF450...
- Page 5 User Manual Notes and Observations 2014 Cervis, Inc.
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Page 7: Cervis Inc. Safety Precautions
User Manual Cervis Inc. Safety Precautions Read and follow all instructions. Failure to abide by Safety Precautions may result in equipment failure, loss of authority to operate the equipment, and personal injury. Use and maintain proper wiring. Follow equipment manufacturer instructions. -
Page 8: Introduction
Module RF450 1.0 Introduction The MRF450 radio module is an RF modem. The module consists of a Silicon Labs RF transceiver coupled with a 32-bit Atmel ARM processor. The module is intended to be integrated into Cervis product, providing RF connectivity while hiding the complexity of RF communications and link management. -
Page 9: Dimensions (Mils)/Locations
P1.6 P1.7 SPI SDO / UART TX P1.7 P1.8 SPI nSS IN, Low P1.8 P1.9 IN/OUT P1.9 -VDC P1.10 F1 / nRESET IN/OUT P1.10 nRESET IN, Low Assignment P1.1 Debug RS232 TX P1.2 Debug RS232 RX P1.3 2014 Cervis, Inc. -
Page 10: Installation
The module contains no adjustable components. Proper RF operation of the module is verified during the manufacturing process using suitable equipment and methods. The manufacturer has performed a tuning process according to the SOC design guidelines. U077.0.2-MRF450... -
Page 11: Electrical Characteristics
The baud rate of the port can be configured. All standard baud rates from 9600 to 115200 are supported with less than 4% error. Non-standard baud rates can also be configured, but, not all requested bauds are possible. Table 2 lists recommended baud rates and associated deviation. 2014 Cervis, Inc. -
Page 12: Rf Characteristics
So, a payload of 4 bytes takes (10 + 4) * 0.000667 = 0.009338s, or 9.3 ms on-the-air. The additional byte (5 Preamble + 2 Sync + 2 CRC32 = 9) comes from the payload structure. The first byte of the payload is a length indicator used by the module to determine payload length. U077.0.2-MRF450... -
Page 13: Operational Modes
It is a violation of CFR 47 to operate this module in Periodic Transmit mode without a license. 2014 Cervis, Inc. -
Page 14: Communication Protocol
A last- byte timer is also maintained. This last-byte timer must elapse before an error message is sent. This ensures that an error message is not sent until the host has completed. U077.0.2-MRF450... -
Page 15: Acknowledgement
RF packet is received and destined for the host. In UART mode the packet will be sent asynchronously. The host must examine the state of F0 in SPI mode in order to determine if a packet is waiting. 2014 Cervis, Inc. -
Page 16: Messages
Sets the address of the module. 0x0018 DST PAN 0x0000 Sets the destination PAN ID for the next transmission. 0x0019 0x0001 Sets the destination address for the next transmission. Address 0xFFFF is a broadcast address. 0x0020 Default 0x00 0x00 = Idle. Lower power consumption. U077.0.2-MRF450... - Page 17 0x01 = Periodic Transmit mode, licensed mode The mode selected sets the modules maximum RF power output. Push-To-Transmit mode complies with license- free operation. Periodic mode is for licensed use only. Please refer to section “6.0 Operational Modes” for details and restrictions. 2014 Cervis, Inc.
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Page 18: Transmit
If set, append the DST Address parameter to the front of the payload. SRC PAN If set, append the My PAN parameter to the front of the payload. SRC Address If set, append the My Address parameter to the front of the payload. U077.0.2-MRF450... -
Page 19: Receive
Based on RX Filter Options, addressing information at the front of the packet may or may not be present. The RSSI indicator can be converted to dBm with the following linear formula Offset should be TBD. 2014 Cervis, Inc. -
Page 20: Error
The Error field is an enumerated type with the following definitions: Error Name Description No Error No Error No SOP SOP is missing Length Length of message exceeds maximum CRC mismatch Bad ID Unsupported message ID Bad Parameter Unsupported parameter address U077.0.2-MRF450... - Page 21 User Manual www.cervisinc.com Visit our Web site at: 2014 Cervis, Inc. All rights reserved. Content is subject to change without notice. 2014 Cervis, Inc.
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